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Bull. Natl. Mus. Nat. Sci., Ser. B, 46(2), pp. 75–87, May 22, 2020
New Localities of Seed Plants Recorded from the Subtropical Ryukyus of Japan at Island Level Based on Herbarium Data
Goro Kokubugata1, *, Atsushi Ebihara1, Yukiko Saito2, Masaharu Amano3, Atsushi Abe3, Koh Nakamura4, Akiyo Naiki5, Tadashi Kajita5 and Masatsugu Yokota6
1 Department of Botany, National Museum of Nature and Science, 4–1–1 Amakubo, Tsukuba, Ibaraki 305–0005, Japan
2 Department of Science Education, Faculty of Education, University of the Ryukyus, Nishihara, Okinawa 903–0213, Japan
3 Okinawa Churashima Research Center, Okinawa Churashima Foundation, 888 Ishikawa, Motobu, Okinawa 905–0206, Japan
4 Botanic Garden, Field Science Center for Northern Biosphere, Hokkaido University, 3–8 Chuo-ku, Sapporo 060–0003, Japan
5 Iriomote Station, Tropical Biosphere Research Center, University of the Ryukyus, 870 Uehara, Yaeyama, Taketomi, Okinawa 907–1541, Japan
6 Laboratory of Ecology and Systematics, Faculty of Science, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903–0213, Japan
*E-mail: [email protected]
(Received 11 February 2020; accepted 25 March 2020)
Abstract We examined specimens of seed plant taxa collected from the subtropical Ryukyus in three herbaria at the Facility of Education and at Science, University of the Ryukyus, and at National Museum of Nature and Science. This examination led to the discovery of 104 new locali-ties for 79 taxa at island level, 19 of which are treated as Japanese-threatened plants.
Key words : conservation, herbarium specimen, island flora, Ryukyus, seed plant, taxonomy, threatened plants.
Introduction
The Ryukyu Archipelago (hereafter, the Ryukyus) comprises approximately 200 islands spanning 1,300 km between Kyushu of Japan and Taiwan. Biogeographically, the Ryukyus are divided into five areas based on floristic charac-ters of each island (Tagawa and Miyagi, 1991; Yokota, 1997; Kokubugata et al., 2010). These five areas are defined as the northern Ryukyus (the Osumi Islands and the majority of the Tokara Islands), the central Ryukyus (the remain-der of the Tokara Islands and the Amami and Okinawa Islands), the southern Ryukyus (the
Miyako and Yaeyama Islands), the Daito Islands and the Senkaku Islands (Fig. 1). The northern Ryukyus are temperate, and belong to the Sino-Japanese floristic region; whereas the remaining four areas are subtropical, and belong to the Southeast Asiatic floristic region (Miyawaki, 1977).
Within the subtropical Ryukyus, some islands have been the subject of intensive floral surveys (e.g., Yokota et al., 1997; Abe et al., 2016; Saito et al., 2019). On the other hand, comprehensive floristic surveys of the subtropical Ryukyus were also conducted by a number of botanists (Hatusima, 1975; Walker, 1976; Hatusima and Amano, 1994; Shimabuku, 1997), but no surveys have been conducted since the report produced © 2020 National Museum of Nature and Science
Goro Kokubugata et al.76
by Shimabuku (1997). In 2015, we begun inves-tigating and revising the flora of the subtropical Ryukyus, and completed a regional database, the Database of Ryukyu Plants (Ryukyu Plant Research Group, 2018 onward). Over the course of the herbarium examinations, we discovered new localities for seed plants at island level in the subtropical Ryukyus.
Materials and Methods
Specimens were identified in the herbaria at the Faculty of Education (URO) and Science (RYU) at the University of the Ryukyus and at the National Museum of Nature and Science (TNS). Following identification, we checked for
existing records in relevant major floristic publi-cations (e.g., Hatusima, 1975; Hatusima and Amano, 1994; Shimabuku, 1997), and noted new island localities discovered for each taxon.
Results and Discussion
We examined 53,917 specimens of 2,168 native seed plant taxa (species, subspecies and varieties) from 187 families. Among all speci-mens collected in the subtropical Ryukyus, we found 104 new localities for 79 taxa in 44 fam-ilies (Table 1).
The new localities were reported from 27 islands of the subtropical Ryukyus: Kikai-jima (6 taxa), Kakeroma-jima (1 taxon), Tokuno-shima
Fig. 1. Five biogeographical areas of the Ryukyu Archipelago of Japan.
New Localities of Plants from the Ryukyus 77
(6 taxa), Okino-erabu-jima (1 taxon), Yoron-jima (2 taxa) in the Amami Islands; Okinawa-jima (10 taxa), Iheya-jima (9 taxa), Izena-jima (5 taxa), Ie-jima (5 taxa), Tokashiki-jima (5 taxa), Zamami-jima (1 taxon), Geruma-jima (2 taxa), Aka-jima (1 taxon), Tonaki-jima (1 taxon), Kume-jima (6 taxa) in the Okinawa Islands; Miyako-jima (4 taxa), Ohgami-jima (1 taxon), Irabu-jima (4 taxa), Shimoji-jima (1 taxon), Kuruma-jima (1 taxon), Tarama-jima (2 taxa) in the Miyako Islands; Ishigaki-jima (6 taxa), Kohama-jima (4 taxa), Iriomote-jima (5 taxa), Hateruma-jima (3 taxa), Yonaguni-jima (8 taxa) in the Yaeyama Islands; and Uotsuri-jima (4 taxa) in the Senkaku Islands.
Nineteen of the 79 taxa were listed on the Red List of the Japanese Ministry of Environment (2019; hereafter, RL2019; Table 1). Out of these, we describe and discuss here conservation, tax-onomic and biogeographic features of 12 taxa: five critically endangered (CR), two endangered (EN), and five vulnerable (VU) species.
Deeringia polysperma (Roxb.) Moq. (Amaran-thaceae; RL2019: CR; Fig. 2A)
This evergreen vine-shrub has been reported from the Miyako (Miyako-jima, Ohgami-jima and Kuruma-jima) and Yaeyama Islands (Ishi-gaki-jima, Iriomote-jima, Kohama-jima, and Hateruma-jima) in the southern Ryukyus; and from Taiwan, China, India, and Malaysia (Yokota et al., 2018a). The populations found on the Miyako Islands represent the northernmost known distribution range of this species.
We report a new locality for this species on Yonaguni-jima of the Yaeyama Islands. Hatusima (1975) previously stated that the Ryukyus plants are morphologically distinct in terms of both leaf number and flower size from those found outside of Japan. It is taxonomically important to investi-gate these morphological characters on the plant from Yonaguni-jima being closest to Taiwan in the Ryukyus.
Rhus javanica L. var. javanica (Anacardiaceae; RL2019: CR; Fig. 2B)
This small deciduous tree was previously reported from Ishigaki-jima and Iriomote-jima in the southern Ryukyus; and from Taiwan, China, and the Himalayan region (Hatusima, 1975). A small number of populations are extant on Ishi-gaki-jima, although the present status of this spe-cies on Iriomote-jima is unclear (Tateishi and Iha, 2018).
We present a new finding of a specimen of this variety from Miyako-jima in the southern Ryukyus. This represents a range expansion for this taxon, as the previous northernmost occur-rence was reported ca. 100 km southwest on Ishi-gaki-jima.
Conyza leucantha (D.Don) Ludlow et Raven (Asteraceae; RL2019: EN; Fig. 2C)
This annual or biennial herb has been reported from Iriomote-jima and Yonaguni-jima in the southern Ryukyus; and widely distributes in Tai-wan, China, Southeast Asia, and Australia (Yokota and Ikehara, 2018).
We discovered a new occurrence of this spe-cies on Ishigaki-jima of the southern Ryukyus, which is the third record from Japan at island level, and represents the northernmost population of this species.
Cordia aspera G.Forst. subsp. kanehirae (Hayata) H.Y.Liu (Boraginaceae; RL2019: CR; Fig. 2D)
This small deciduous tree was previously reported from Ishigaki-jima, Iriomote-jima in the Yaeyama Islands, and Uotsuri-jima in the Sen-kaku Islands (Yonekura, 2017).
We report a new record of this subspecies from Yonaguni-jima in the Yaeyama Islands, which is situated near Taiwan. Some taxonomists treat the Ryukyu plants as C. cumingiana Vidal, which is distributed in Japan, Taiwan and the Philippines (e.g., Hatusima, 1975). Therefore, this record from Yonaguni-jima is important for determining the taxonomic and phylogeographi-cal relationship between the Ryukyus and Tai-wan.
Goro Kokubugata et al.78Ta
ble.
1.
New
reco
rd o
f see
d pl
ants
at i
slan
d le
vel a
nd th
eir v
ouch
er sp
ecim
ens a
nd lo
calit
y in
form
atio
n in
the
subt
ropi
cal R
yuky
us, J
apan
Fam
ilySp
ecie
sJa
pane
se c
omm
on n
ame
RL2
019
stat
us*
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lity
(per
sona
l no.
, her
bariu
m n
o. o
f vou
cher
spec
imen
)C
olle
ctio
n da
te
Aca
ntha
ceae
Hyg
roph
ila sa
licifo
lia (V
ahl)
Nee
sO
gino
-tsum
eSo
uthe
rn R
yuky
us, M
iyak
o Is
land
s, M
iyak
o-jim
a. (Z
. Nak
ason
e s.n
., TN
S581
15)
Nov
22,
193
7Le
pida
gath
is in
aequ
alis
C.B
.Cla
rke
ex E
lmer
Ryuk
yu-u
roko
mar
iCe
ntra
l Ryu
kyus
, Oki
naw
a Is
land
s, K
ume-
jima,
Gim
a-ga
wa
Rive
r. (M
. Yok
ota
1531
9, T
NS1
1837
83)
Nov
2, 2
012
Sout
hern
Ryu
kyus
, Miy
ako
Isla
nds,
Kur
uma-
jima.
(G. I
keda
421
9, R
YU
4161
6)Se
pt 2
6, 1
977
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aran
thac
eae
Dee
ring
ia p
olys
perm
a (R
oxb.
) Moq
.In
do-h
imo-
kazu
raC
RSo
uthe
rn R
yuky
us, Y
aeya
ma
Isla
nds,
Yona
guni
-jim
a. (K
. Shi
njo
5273
, UR
O10
5165
)Ju
ly 4
, 196
7A
naca
rdia
ceae
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java
nica
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ar. j
avan
ica
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an-f
ushi
noki
CR
Sout
hern
Ryu
kyus
, Miy
ako
Isla
nds,
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ako-
jima,
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maj
iri. (
S. Is
a s.n
., RY
U12
792)
Aug
16,
196
9So
uthe
rn R
yuky
us, M
iyak
o Is
land
s, M
iyak
o-jim
a, O
hura
. (I.
Inou
e s.n
., RY
U18
082)
July
15,
197
0A
pocy
nace
aeTy
loph
ora
tana
kae
Max
im. v
ar. g
labr
esce
ns H
atus
. ex
T.Ya
maz
.K
enas
hi-ts
urum
orin
kaN
TSe
nkak
u Is
land
s, U
otsu
ri-jim
a. (S
. Tam
aki &
Y. N
iiro
s.n.,
RYU
5128
)A
pr 3
, 197
1Se
nkak
u Is
land
s, U
otsu
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a. (Y
. Miy
agi &
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atus
ima
3996
5, R
YU
3623
4)A
pr 1
6, 1
975
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ifolia
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liuki
uens
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oes.
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yu-m
ochi
Cen
tral R
yuky
us, O
kina
wa
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nds,
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uma-
jima.
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amaz
aki 6
24, T
NS3
2523
6)O
ct 1
2, 1
972
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war
burg
ii Lo
es.
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shiib
amoc
hiSe
nkak
u Is
land
s, U
otsu
ri-jim
a. (Y
. Miy
agi &
S. H
atus
ima
3997
5, R
YU
3621
7)A
pr 1
6, 1
975
Ara
liace
aeH
ydro
coty
le m
ariti
ma
Hon
daN
o-ch
idom
eSo
uthe
rn R
yuky
us, M
iyak
o Is
land
s, Sh
imoj
i-jim
a, K
amiji
(Y
. Miy
agi,
E. N
akad
a &
S. H
atus
ima
s.n.,
RYU
1619
6)D
ec 4
, 197
3
Cen
tral R
yuky
us, A
mam
i Isl
ands
, Kik
ai-ji
ma.
(K. Y
oshi
naga
423
, RY
U35
159)
June
21,
197
5H
ydro
coty
le si
btho
rpio
ides
Lam
. var
. tub
erife
ra (O
hwi)
T.Ya
maz
.O
kina
wa-
chid
omeg
usa
Cen
tral R
yuky
us, O
kina
wa
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nds,
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ma,
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on Y
outh
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age.
(H
. Oga
wa,
Y. T
atei
shi,
M. I
zu &
Y. N
akam
oto
820,
UR
O11
6121
)M
ar 9
, 199
5
Ast
erac
eae
Ains
liaea
mac
rocl
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ioid
es H
ayat
a va
r. ok
inaw
ensi
s (H
ayat
a) K
itam
.O
kina
wa-
hagu
ma
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
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shik
i-jim
a. (Y
. Miy
agi &
T. K
abas
him
a 44
50, R
YU
2183
6)M
ay 1
6, 1
974
Arte
mis
ia m
orri
sone
nsis
Hay
ata
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aka-
yom
ogi
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, H
ater
uma-
jima,
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ana-
zaki
. (K
. Yas
uda
6224
, TN
S102
8706
)Ju
ne 2
5, 2
007
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ea la
nceo
lari
a (R
oxb.
) Dru
ceK
azuz
aki-k
ozor
ina
Senk
aku
Isla
nds,
Uot
suri-
jima.
(Y. N
iiro
& S
. Tam
aki s
.n.,
RYU
2698
)A
pr 3
, 197
1C
arpe
sium
cer
nuum
L.
Ko-
yabu
taba
koSo
uthe
rn R
yuky
us, M
iyak
o Is
land
s, Ir
abu-
jima.
(T. A
man
o s.n
., RY
U26
592)
July
27,
195
0C
onyz
a le
ucan
tha
(D.D
on) L
udlo
w e
t Rav
enN
ebar
i-izu
-hah
ako
ENSo
uthe
rn R
yuky
us, Y
aeya
ma
Isla
nds,
Ishi
gaki
-jim
a, M
t. N
osok
o-da
ke. (
E. T
akam
ine
s.n.,
RYU
2565
4)Ju
ne, 1
947
Sige
sbec
kia
glab
resc
ens (
Mak
ino)
Mak
ino
Ko-
men
amom
iC
entra
l Ryu
kyus
, Am
ami I
slan
ds, K
ikai
-jim
a. (K
. Yos
hina
ga 1
71, R
YU
4663
9)M
ay 5
, 197
5B
orag
inac
eae
Cor
dia
aspe
ra G
.For
st. s
ubsp
. kan
ehir
ae (H
ayat
a) H
.Y.L
iuTo
gem
ino-
inuc
hish
aC
RSo
uthe
rn R
yuky
us, Y
aeya
ma
Isla
nds,
Yona
guni
-jim
a. (T
. Tam
aki &
Y. N
iiro
s.n.,
RYU
1550
)M
ar 2
7, 1
972
Cor
dia
dich
otom
a G
.For
st.
Kak
iba-
chis
hano
kiC
entra
l Ryu
kyus
, Am
ami I
slan
ds, T
okun
o-sh
ima,
Om
onaw
a. (H
. Mig
o 26
919,
TN
S373
842)
Apr
14,
196
6Tr
igon
otis
ped
uncu
lari
s (Tr
evir.
) Ben
th. e
x H
emsl
.K
yuri-
gusa
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Izen
a-jim
a. (J
. Miy
agi s
.n.,
RYU
1056
4)M
ar 9
, 197
1So
uthe
rn R
yuky
us, Y
aeya
ma
Isla
nds,
Ishi
gaki
-jim
a, Y
oneh
ara.
(K
. Yas
uda,
H. S
etog
uchi
& N
. Nom
ura
4006
, TN
S102
9052
)A
pr 1
4, 2
005
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Is
higa
ki-ji
ma,
Yon
ehar
a.
(K. Y
asud
a, H
. Set
oguc
hi &
N. N
omur
a 40
06, T
NS1
1351
43)
Apr
14,
200
5
Can
naba
ceae
Hum
ulus
scan
dens
(Lou
r.) M
err.
Kan
a-m
ugur
aC
entra
l Ryu
kyus
, Oki
naw
a Is
land
s, O
kina
wa-
jima.
(T. T
akar
a s.n
., RY
U41
967)
June
4, 1
978
Cap
rifol
iace
aeLo
nice
ra a
ffini
s Hoo
k. e
t Arn
.H
aman
indo
Cen
tral R
yuky
us, A
mam
i Isl
ands
, Tok
uno-
shim
a, T
akis
e. (H
. Mig
o s.n
., TN
S739
42)
Apr
12,
196
6C
entra
l Ryu
kyus
, Am
ami I
slan
ds, K
aker
oma-
jima,
Aki
toku
. (G
. Kok
ubug
ata
& M
. Tab
ata
1899
9, T
NS1
2658
21)
Jan
11, 2
016
Cel
astra
ceae
Cel
astr
us k
usan
oi H
ayat
aRy
ukyu
-tsur
u-um
emod
oki
Cen
tral R
yuky
us, A
mam
i Isl
ands
, Yor
on-ji
ma.
(Y. J
otan
i s.n
., TN
S829
744)
Dec
11,
197
4C
entra
l Ryu
kyus
, Am
ami I
slan
ds, Y
oron
-jim
a. (Y
. Jot
ani s
.n.,
TNS8
2974
5)D
ec 1
1, 1
974
Cen
tral R
yuky
us, A
mam
i Isl
ands
, Yor
on-ji
ma.
(Y. J
otan
i s.n
., TN
S829
746)
Dec
11,
197
4C
onvo
lvul
acea
eEr
ycib
e he
nryi
Pra
inH
orut
okaz
ura
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Kum
e-jim
a. (Y
. Niir
o s.n
., RY
U18
897)
Dec
28,
195
7Ip
omoe
a im
pera
ti (V
ahl)
Gris
eb.
Ats
uba-
asag
aoSo
uthe
rn R
yuky
us, M
iyak
o Is
land
s, Ir
abu-
jima.
(S. S
akag
uchi
18,
TN
S636
09)
Aug
, 192
2So
uthe
rn R
yuky
us, M
iyak
o Is
land
s, Ir
abu-
jima.
(S. S
akag
uchi
s.n.
, TN
S636
10)
Aug
, 192
2C
entra
l Ryu
kyus
, Oki
naw
a Is
land
s, To
naki
-jim
a. (H
. Hig
a s.n
., RY
U28
200)
Oct
8, 1
974
Sout
hern
Ryu
kyus
, Miy
ako
Isla
nds,
Tara
ma-
jima.
(Y. M
iyag
i 707
9, R
YU
3737
9)Se
pt 2
6, 1
975
Cuc
urbi
tace
aeTr
icho
sant
hes k
irilo
wii
Max
im. v
ar. j
apon
ica
(Miq
.) K
itam
.K
i-kar
asu-
uri
Cent
ral R
yuky
us, O
kina
wa
Isla
nds,
Oki
naw
a-jim
a, N
aha-
shi,
Tono
kura
. (S.
Nak
amin
e s.n
., S1
1645
6)A
ug 9
, 195
4C
upre
ssac
eae
Juni
peru
s tax
ifolia
Hoo
k. e
t Arn
. var
. lut
chue
nsis
(Koi
dz.)
Sata
keO
kina
wa-
hain
ezu
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Yo
nagu
ni-ji
ma.
(K. S
hinj
o 12
782,
UR
O10
1604
)M
ar 9
, 199
3C
yper
acea
eC
arex
isch
nost
achy
a St
eud.
var
. fas
tigia
ta T
.Koy
ama
Oki
naw
a-ju
zusu
geSo
uthe
rn R
yuky
us, Y
aeya
ma
Isla
nds,
Irio
mot
e-jim
a, O
htom
i For
est R
oad.
(Y
. Kob
ana
1059
1, T
NS1
0918
24)
Apr
15,
199
3
Car
ex n
emos
tach
ys S
teud
.A
ki-k
asas
uge
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Kum
e-jim
a. (S
. Sak
aguc
hi s.
n., T
NS2
2000
4)U
nkno
wn
Fim
bris
tylis
ferr
ugin
ea (L
.) Va
hl v
ar. s
iebo
ldii
(M
iq. e
x Fr
anch
. et S
av.)
Ohw
iIs
oyam
a-te
ntsu
kiC
entra
l Ryu
kyus
, Oki
naw
a Is
land
s, O
kina
wa-
jima,
Hig
ashi
-son
, Kes
aji M
angr
ove.
(T
. Am
ano
6696
, TN
S264
876)
July
27,
195
1
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Is
higa
ki-ji
ma,
Nag
ura-
gaw
a R
iver
. (K
. Yas
uda
2980
, TN
S102
8537
)N
ov 4
, 200
4
New Localities of Plants from the Ryukyus 79Fa
mily
Spec
ies
Japa
nese
com
mon
nam
eR
L201
9 st
atus
*Lo
calit
y (p
erso
nal n
o., h
erba
rium
no.
of v
ouch
er sp
ecim
en)
Col
lect
ion
date
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Is
higa
ki-ji
ma,
Nag
ura-
gaw
a R
iver
. (K
. Yas
uda
2980
, TN
S102
8538
)N
ov 4
, 200
4
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Is
higa
ki-ji
ma,
Sak
ieda
. (E.
Tak
amin
e 14
8, T
NS2
3470
9)Ju
ly 2
4, 1
938
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Oki
naw
a-jim
a, H
igas
hi-s
on, K
esaj
i. (T
. Am
ano
s.n.,
RYU
2772
4)Ju
ly 2
2, 1
951
Fim
bris
tylis
tash
iroan
a O
hwi
Tsuk
ushi
-tent
suki
VU
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Ir
iom
ote-
jima,
Mih
ara.
(T. K
itaha
ra 6
264,
TN
S111
3778
)Ju
ly 6
, 200
7G
ahni
a tr
istis
Nee
sK
urog
aya
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, K
oham
a-jim
a. (K
. Shi
njo
& Y
. Tat
eish
i 109
43, U
RO
1024
61)
Mar
26,
199
8Li
poca
rpha
chi
nens
is (O
sbec
k) K
ern
Oh-
hinj
i-gay
atsu
riC
entra
l Ryu
kyus
, Oki
naw
a Is
land
s, Iz
ena-
jima.
(E. N
akat
a s.n
., RY
U11
654)
Aug
23,
197
3Li
poca
rpha
mic
roce
phal
a (R
.Br.)
Kun
thH
inji-
gaya
tsur
iCe
ntra
l Ryu
kyus
, Oki
naw
a Is
land
s, K
ume-
jima,
Shi
rase
-gaw
a Ri
ver.
(K. Y
asud
a 33
54, T
NS1
0285
46)
Jan
17, 2
005
Cent
ral R
yuky
us, O
kina
wa
Isla
nds,
Kum
e-jim
a, S
hira
se-g
awa
Rive
r. (K
. Yas
uda
3354
, TN
S102
8547
)Ja
n 17
, 200
5Ce
ntra
l Ryu
kyus
, Oki
naw
a Is
land
s, K
ume-
jima,
Shi
rase
-gaw
a Ri
ver.
(K. Y
asud
a 33
54, T
NS1
0285
48)
Jan
17, 2
005
Mac
haer
ina
rubi
gino
sa (S
ol. e
x G
.For
st.)
T.K
oyam
aN
ebik
igus
aSo
uthe
rn R
yuky
us, M
iyak
o Is
land
s, M
iyak
o-jim
a, M
t. O
hno-
yam
a. (S
. Taw
ada
979,
TN
S231
834)
Aug
22,
194
2Se
nkak
u Is
land
s, U
otsu
ri-jim
a. (S
. Taw
ada
75, T
NS1
0157
8)A
pr 1
6, 1
952
Erio
caul
acea
eEr
ioca
ulon
trun
catu
m B
uch.
-Ham
. ex
Mar
t.Su
isya
-hos
hiku
saC
RC
entra
l Ryu
kyus
, Oki
naw
a Is
land
s, Ih
eya-
jima,
Dan
a. (K
. Shi
njo
729,
UR
O10
2682
)D
ec 2
9, 1
956
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Izen
a-jim
a. (E
. Nak
ada
s.n.,
RYU
1165
2)A
ug 2
3, 1
973
Faba
ceae
Cae
salp
inia
bon
duc
(L.)
Rox
b.Sh
irots
ubu
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Oki
naw
a-jim
a. (T
. Yam
azak
i & H
. Usu
i 208
6, T
NS1
6156
6)D
ec 2
0, 1
963
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Yo
nagu
ni-ji
ma,
Hig
awa.
(G
. Kok
ubug
ata
& M
. Yok
ota
1416
3, T
NS1
1405
21)
Oct
19,
200
1
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Oki
naw
a-jim
a, H
ento
na.
(Y. T
atei
shi,
S. M
atsu
mur
a, T
. Yam
ashi
ro &
E. T
amak
i 435
17, U
RO
1099
47)
June
28,
199
6
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Oki
naw
a-jim
a, H
ento
na.
(Y. T
atei
shi,
S. M
atsu
mur
a, T
. Yam
ashi
ro &
E. T
amak
i 435
18, U
RO
1099
53)
June
28,
199
6
Sout
hern
Ryu
kyus
, Miy
ako
Isla
nds,
Ohg
ami-j
ima.
(G
. Kok
ubug
ata,
M. Y
okot
a, A
. Abe
153
06, T
NS1
1837
81)
Oct
22,
201
2
Chr
istia
obc
orda
ta (P
oir.)
Bak
h.f.
ex v
an M
eeuw
enH
ozuk
i-hag
iSo
uthe
rn R
yuky
us, M
iyak
o Is
land
s, Ir
abu-
jima,
gro
und
of S
awad
a W
orke
r Rec
reat
ion
Cen
ter.
(Y
. Tat
eish
i, H
. Oga
wa
& A
. Tak
ada
4029
8, U
RO
1100
37)
Sept
18,
199
4
Sout
hern
Ryu
kyus
, Miy
ako
Isla
nds,
Irab
u-jim
a. (E
. Sug
ama
s.n.,
UR
O11
0036
)A
pr 1
2, 1
996
Sout
hern
Ryu
kyus
, Miy
ako
Isla
nds,
Irab
u-jim
a, S
abao
ki P
ark.
(M. A
man
o 14
66, U
RO
1100
34)
June
12,
201
2D
esm
odiu
m le
ptop
us A
.Gra
y ex
Ben
th.
Toki
wa-
yabu
hagi
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Yo
nagu
ni-ji
ma.
(S. H
atus
ima,
H. K
anai
, K. S
him
abuk
u,
Y. M
iyag
i, E.
Nak
ata,
& M
. Fur
use
7322
34 ,
TNS2
9705
4)Se
pt 3
0, 1
973
Muc
una
giga
ntea
(Will
d.) D
C. s
ubsp
. gig
ante
aW
anig
uchi
-mod
ama
NT
Cen
tral R
yuky
us, A
mam
i Isl
ands
, Tok
uno-
shim
a, se
asid
e of
Oht
su-g
awa
Riv
er.
(G. K
okub
ugat
a, M
. Yok
ota
& H
. Yam
ashi
ta 1
2477
, TN
S011
0387
7)Fe
b 7,
201
0
Faga
ceae
Que
rcus
gla
uca
Thun
b. v
ar. a
mam
iana
(Hat
us.)
Hat
us. e
x H
.Ohb
aA
mam
i-ara
kash
iC
entra
l Ryu
kyus
, Am
ami I
slan
ds, K
ikai
-jim
a. (K
. Yos
hina
ga 1
327,
RY
U40
347)
Aug
9, 1
977
Gar
ryac
eae
Aucu
ba ja
poni
ca T
hunb
. var
. ovo
idea
Koi
dz.
Nan
goku
-aok
iC
entra
l Ryu
kyus
, Oki
naw
a Is
land
s, Ih
eya-
jima.
(K. S
hinj
o 20
30, U
RO
1145
92)
Jan
8, 1
958
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Toka
shik
i-jim
a. (Y
. Miy
agi &
T. K
abas
him
a 44
52, R
YU
2174
5)M
ay 1
6, 1
974
Hel
win
giac
eae
Hel
win
gia
japo
nica
(Thu
nb.)
F.D
ietr.
subs
p.
liuki
uens
is (H
atus
.) H
.Har
a et
S.K
uros
.Ry
ukyu
-han
aika
daN
TC
entra
l Ryu
kyus
, Oki
naw
a Is
land
s, K
ume-
jima,
Oh-
dake
. (F.
Mae
kaw
a s.n
., TN
S882
512)
Feb
15, 1
974
Hyd
roch
arita
ceae
Enha
lus a
coro
ides
(L.f.
) Ric
h. e
x St
eud.
Um
i-sho
buV
USo
uthe
rn R
yuky
us, Y
aeya
ma
Isla
nds,
Koh
ama-
jima.
(Y. M
iyag
i 657
0, R
YU
3768
5)Ju
ly 7
, 197
5H
yper
icac
eae
Hyp
eric
um la
xum
(Blu
me)
Koi
dz.
Kok
e-ot
ogiri
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Is
higa
ki-ji
ma,
Mt.
Om
oto-
dake
. (K.
Shi
njo
1225
, URO
1087
54)
Mar
2, 1
957
Junc
acea
eJu
ncus
dec
ipie
ns (B
uche
nau)
Nak
aiIg
usa
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Toka
shik
i-jim
a. (Y
. Miy
agi &
S. O
yado
mar
i 126
5, R
YU
9052
)M
ay 6
, 197
3C
entra
l Ryu
kyus
, Am
ami I
slan
ds, K
ikai
-jim
a. (K
. Yos
hina
ga 1
427,
RY
U40
311)
Sept
15,
197
7Ju
ncus
lesc
hena
ultii
J.G
ay e
x La
harp
eK
ogai
-zek
isho
Cen
tral R
yuky
us, A
mam
i Isl
ands
, Tok
uno-
shim
a. (Y
. Miy
agi &
S. H
atus
ima
3955
1, R
YU
3418
1)Fe
b 12
, 197
5La
mia
ceae
Mos
la sc
abra
(Thu
nb.)
C.Y
.Wu
et H
.W.L
iIn
ukoj
uC
entra
l Ryu
kyus
, Am
ami I
slan
ds, T
okun
o-sh
ima.
(Y. J
otan
i & S
. Mas
uda
s.n.,
TNS8
2926
2)Ju
ly 1
2, 1
973
Pogo
stem
on st
ella
tus (
Lour
.) K
untz
eM
izu-
neko
noN
TC
entra
l Ryu
kyus
, Oki
naw
a Is
land
s, O
kina
wa-
jima,
Kun
igam
i-son
, Oku
. (Y.
Tai
ra 3
85, T
NS2
3128
4)Se
pt 2
6, 1
938
Laur
acea
eC
inna
mom
um d
oede
rlei
nii E
ngl.
var.
pseu
doda
phno
ides
Hat
us.
Ke-
shib
anik
kei
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Ie-ji
ma,
Ie B
each
. (S.
Hat
usim
a 33
988,
RY
U46
30)
May
21,
197
2M
achi
lus j
apon
ica
Sieb
old
et Z
ucc.
ex
Blu
me
var.
japo
nica
Aog
ashi
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Yo
nagu
ni-ji
ma.
(S
. Hat
usim
a, Y
. Miy
agi &
E. N
akat
a 35
781,
RY
U14
850)
Sept
29,
197
3
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Toka
shik
i-jim
a. (Y
. Miy
agi &
T. K
abas
him
a 47
89, R
YU
2215
1)M
ay 1
6, 1
974
Lecy
thid
acea
eBa
rrin
gton
ia ra
cem
osa
(L.)
Spre
ng.
Saga
riban
aSo
uthe
rn R
yuky
us, Y
aeya
ma
Isla
nds,
Hat
erum
a-jim
a. (Y
. Miy
agi 6
722,
RY
U35
912)
July
9, 1
975
Lind
erni
acea
eTo
reni
a co
ncol
or L
indl
.Ts
uru-
urik
usa
ENC
entra
l Ryu
kyus
, Am
ami I
slan
ds, K
ikai
-jim
a. (K
. Yos
hina
ga 1
415,
RY
U40
367)
Sept
15,
197
7
Tabl
e. 1
. C
ontin
ued.
Goro Kokubugata et al.80Fa
mily
Spec
ies
Japa
nese
com
mon
nam
eR
L201
9 st
atus
*Lo
calit
y (p
erso
nal n
o., h
erba
rium
no.
of v
ouch
er sp
ecim
en)
Col
lect
ion
date
Men
ispe
rmac
eae
Peri
cam
pylu
s for
mos
anus
Die
lsH
orai
-tsuz
uraf
uji
CR
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Is
higa
ki-ji
ma,
Nag
ura-
gaw
a R
iver
. (K
. Yas
uda,
M. Y
okot
a, S
. Hig
a, H
. Tom
iyam
a, S
. Mat
sush
ima
& T
. Kita
hara
526
0, T
NS1
1144
99)
Feb
4, 2
007
Men
yant
hace
aeN
ymph
oide
s cor
eana
(H.L
év.)
H.H
ara
Him
e-sh
iroas
aza
VU
Sout
hern
Ryu
kyus
, Miy
ako
Isla
nds,
Irab
u-jim
a. (T
. Am
ano
s.n.,
RYU
2534
8)Ju
ly 2
7, 1
950
Mor
acea
eFi
cus c
aulo
carp
a (M
iq.)
Miq
.O
hba-
ako
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Oki
naw
a-jim
a, N
akiji
n-so
n, W
akug
awa.
(T
. Kan
asiro
s.n.
, RY
U25
419)
Apr
29,
193
9
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Toka
shik
i-jim
a. (K
. Shi
mab
uku
4188
, RY
U41
284)
July
8, 1
978
Ficu
s thu
nber
gii M
axim
.H
ime-
itabi
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Ihey
a-jim
a. (Y
. Niir
o s.n
., RY
U19
855)
Dec
28,
195
8So
uthe
rn R
yuky
us, Y
aeya
ma
Isla
nds,
Yona
guni
-jim
a.
(S. H
atus
ima,
H. K
anai
, K. S
him
abuk
u, Y
. Miy
agi &
E. N
akat
a 72
2362
, TN
S318
258)
Oct
3, 1
973
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Yo
nagu
ni-ji
ma.
(Y. J
otan
i 385
37, T
NS8
4931
5)M
ay 5
, 198
1O
leac
eae
Jasm
inum
supe
rfluu
m K
oidz
.O
kina
wa-
soke
iV
UC
entra
l Ryu
kyus
, Oki
naw
a Is
land
s, Ih
eya-
jima.
(S. K
ayô
s.n.,
RYU
1034
9)A
ug 2
9, 1
970
Ona
grac
eae
Ludw
igia
ads
cend
ens (
L.) H
.Har
aK
e-m
izuk
imba
iV
USo
uthe
rn R
yuky
us, Y
aeya
ma
Isla
nds,
Koh
ama-
jima.
(Y. M
iyag
i 653
5, R
YU
3764
9)Ju
ly 7
, 197
5O
rchi
dace
aeM
icro
tis p
arvi
flora
R.B
r.N
iraba
-ran
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Ihey
a-jim
a, M
t. K
uba-
yam
a.
(K. S
hinj
o &
Y. T
atei
shi 7
90, U
RO
1045
69)
May
4, 1
995
Zeux
ine
stra
teum
atic
a (L
.) Sc
hltr.
Kin
u-ra
nC
entra
l Ryu
kyus
, Oki
naw
a Is
land
s, Iz
ena-
jima.
(J. M
iyag
i s.n
., RY
U11
178)
Mar
9, 1
971
Papa
vera
ceae
Cor
ydal
is h
eter
ocar
pa S
iebo
ld e
t Zuc
c. v
ar. b
rach
ysty
la (K
oidz
.) O
hwi
Mun
in-k
ikem
anC
entra
l Ryu
kyus
, Am
ami I
slan
ds, Y
oron
-jim
a. (J
. Hag
iniw
a 01
6754
, TN
S966
754)
Dec
24,
197
1C
entra
l Ryu
kyus
, Am
ami I
slan
ds, Y
oron
-jim
a. (J
. Hag
iniw
a 01
6755
, TN
S966
755)
Dec
24,
197
1C
entra
l Ryu
kyus
, Am
ami I
slan
ds, K
ikai
-jim
a, A
kare
n. (H
. Mur
akam
i 437
, TN
S689
342)
Apr
19,
199
8Pe
ntap
hyla
cace
aeEu
rya
osim
ensi
s Mas
am.
Am
ami-h
isak
aki
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Ir
iom
ote-
jima,
Mt.
Kom
i-dak
e.
(G. K
okub
ugat
a, M
. Yok
ota
& K
. Yas
uda
5458
, TN
S951
9088
)D
ec 2
1, 2
004
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Iri
omot
e-jim
a, A
ira-g
awa
Rive
r. (K
. Yas
uda
5376
, TN
S111
9995
)M
ar 1
3, 2
007
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Ir
iom
ote-
jima.
(S. K
urat
a &
T. N
akai
ke 3
30, T
NS3
6936
7)Ju
ne 1
, 197
3So
uthe
rn R
yuky
us, Y
aeya
ma
Isla
nds,
Irio
mot
e-jim
a, M
t. K
omi-d
ake.
(G
. Kok
ubug
ata,
M. Y
okot
a &
K. Y
asud
a 54
03, T
NS9
5190
36)
Dec
21,
200
4
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Ir
iom
ote-
jima,
Mt.
Kom
i-dak
e.
(G. K
okub
ugat
a, M
. Yok
ota
& K
. Yas
uda
5404
, TN
S951
9037
)D
ec 2
1, 2
004
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Ir
iom
ote-
jima,
Uda
ra-g
awa,
Riv
er.
(K. Y
asud
a, M
. Yok
ota,
G. K
okub
ugat
a, S
. Hig
a, H
. Tom
iyam
a &
T. K
itaha
ra 5
395,
TN
S111
9720
)M
ar 2
4, 2
007
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Iri
omot
e-jim
a, A
ira-g
awa
Rive
r. (K
. Yas
uda
5376
, TN
S111
9994
)M
ar 1
3, 2
007
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Ir
iom
ote-
jima,
Ura
uchi
-gaw
a R
iver
. (G
. Kok
ubug
ata
1115
1, T
NS9
5430
99)
Oct
24,
200
8
Phry
mac
eae
Mic
roca
rpae
a m
inim
a (K
.D.K
oeni
g ex
Ret
z.) M
err.
Suzu
men
o-ha
kobe
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Ihey
a-jim
a. (S
. Hat
usim
a &
al.
3508
9, R
YU
1169
4)Ju
ly 2
3, 1
973
Phyl
lant
hace
aeG
loch
idio
n la
nceo
latu
m H
ayat
aK
irun-
kank
onok
iC
entra
l Ryu
kyus
, Oki
naw
a Is
land
s, Ih
eya-
jima.
(S. H
atus
ima
& a
l. 35
085,
RY
U11
698)
July
24,
197
3C
entra
l Ryu
kyus
, Oki
naw
a Is
land
s, Ih
eya-
jima.
(S. H
atus
ima
& a
l. 35
117,
RY
U11
726)
July
24,
197
3C
entra
l Ryu
kyus
, Oki
naw
a Is
land
s, A
ka-ji
ma.
(Y. M
iyag
i 793
1, R
YU
4295
7)A
ug 1
2, 1
977
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Aka
-jim
a. (Y
. Miy
agi 7
751,
RY
U44
160)
Aug
12,
197
7Po
acea
eC
yrto
cocc
um p
aten
s (L.
) A.C
amus
Him
e-ch
igoz
asa
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, H
ater
uma-
jima.
(Y. M
iyag
i 671
1, R
YU
3810
3)Ju
ly 9
, 197
5D
igita
ria
prur
iens
(Fis
ch. e
x Tr
in.)
Büs
eH
itota
ba-m
ehis
hiba
NT
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Zam
ami-j
ima.
(Y. N
iiro
& Y
. Miy
agi 3
071,
RY
U30
50)
Sept
14,
197
3Le
ersi
a he
xand
ra S
w.Ta
iwan
-ash
ikak
iN
TC
entra
l Ryu
kyus
, Oki
naw
a Is
land
s, Ie
-jim
a. (S
. Kay
ô s.n
., RY
U20
672)
Apr
, 197
1Le
ptoc
hloa
chi
nens
is (L
.) N
ees
Aze
gaya
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Oki
naw
a-jim
a, N
aha-
shi,
Tsub
oya.
(Y. T
aira
278
, TN
S233
978)
June
19,
193
8So
uthe
rn R
yuky
us, Y
aeya
ma
Isla
nds,
Irio
mot
e-jim
a, H
oshi
date
. (K
. Yas
uda
2720
, TN
S102
8241
)Ju
ne 1
0, 2
004
Mic
rost
egiu
m ja
poni
cum
(Miq
.) K
oidz
.Sa
saga
yaC
entra
l Ryu
kyus
, Oki
naw
a Is
land
s, O
kina
wa-
jima,
Mt.
Yona
ha-d
ake.
(S. T
amak
i s.n
., RY
U28
87)
Nov
8, 1
970
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Ir
iom
ote-
jima,
Shi
raha
ma.
(M. F
urus
e 30
12, R
YU
1115
8)A
pr 2
2, 1
973
Sacc
iole
pis i
ndic
a (L
.) C
hase
var
. ory
zeto
rum
(Mak
ino)
Ohw
iN
umer
i-gus
aC
entra
l Ryu
kyus
, Oki
naw
a Is
land
s, Ie
-jim
a. (S
. Kay
ô s.n
., RY
U19
560)
May
22,
197
0C
entra
l Ryu
kyus
, Oki
naw
a Is
land
s, Ih
eya-
jima.
(S. K
ayô
s.n.,
RYU
1956
2)A
ug, 1
970
Cen
tral R
yuky
us, A
mam
i Isl
ands
, Oki
no-e
rabu
-jim
a. (S
. Hat
usim
a &
Y. M
iyag
i 390
04, R
YU
3139
9)D
ec 1
0, 1
974
Poly
gona
ceae
Pers
icar
ia se
ntic
osa
(Mei
sn.)
H.G
ross
Mam
akon
o-sh
irinu
gui
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Kum
e-jim
a. (C
. Shi
rom
a s.n
., TN
S106
5846
)Ju
ly, 1
919
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Is
higa
ki-ji
ma,
Kab
ira. (
T. A
man
o 72
98, T
NS1
1632
5)A
pr 1
9, 1
954
Ros
acea
ePr
unus
zipp
elia
na M
iq.
Bak
uchi
noki
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Ihey
a-jim
a. (S
. Hat
usim
a &
al.
3510
7, R
YU
1173
0)Ju
ly 2
4, 1
973
Rubu
s gra
yanu
s Max
im.
Ryuk
yu-ic
higo
Cen
tral R
yuky
us, O
kina
wa
Isla
nds,
Ger
uma-
jima.
(Y. N
iiro
s.n.,
RYU
2832
)A
ug 1
5, 1
960
Tabl
e. 1
. C
ontin
ued.
New Localities of Plants from the Ryukyus 81
Fimbristylis dichotoma (L.) Vahl subsp. podo-carpa (Nees et Meyen) T.Koyama (Cyperaceae; RL2019: VU; Fig. 3A)
This perennial sedge has been reported from Okinawa-jima in the central Ryukyus and Ish-igaki-jima in the southern Ryukyus; from Kyushu of Japan; and is widely distributed in India, Malaysia, and the Pacific Islands (Yokota and Nakata, 2018). Three and one populations are respectively known from Okinawa-jima and Ishigaki-jima at present (Yokota and Nakata, 2018).
We report a new locality for this species on Iriomote-jima in the southern Ryukyus. Some taxonomists treat the Ryukyu plants as F. tashiro-ana Ohwi being endemic to Japan (Ohwi, 1931). Therefore, further study is required to investigate the endemism of the plants from Japan including Iriomote-jima.
Eriocaulon truncatum Buch.-Ham. ex Mart. (Eriocaulaceae; RL2019: CR; Fig. 3B)
This helophyte grass was previously reported from Tokuno-shima, Okinawa-jima, Kume-jima in the central Ryukyus, Ishigaki-jima, Iriomote-jima and Yonaguni-jima in the southern Ryukyus (Tateishi et al., 2018a); and from Taiwan, China, Indochina, the Philippines and Thailand (Miyamoto, 2015). Although several populations occur in the northern and central parts of Oki-nawa-jima, the majority of populations have been destroyed by anthropogenic development (Tateishi et al., 2018a). A few populations are known from Ishigaki-jima and Iriomote-jima, but the present status of populations occurring on other islands is unclear (Tateishi et al., 2018a).
We recorded a first occurrence of E. truncatum from Dana, Iheya-jima in the central Ryukyus. The locality includes a wetland habitat, and many helophyte species have been reported from this area (Niiro and Shinzato, 1978). However, these wetlands are threatened by ongoing devel-opment and the spread of naturalized plant spe-cies. Some taxonomists treat the Ryukyu plants as Eriocaulon nigrum Lecomte var. suishaense (Hayata) Hatusima et T.Koyama distributed in
Fam
ilySp
ecie
sJa
pane
se c
omm
on n
ame
RL2
019
stat
us*
Loca
lity
(per
sona
l no.
, her
bariu
m n
o. o
f vou
cher
spec
imen
)C
olle
ctio
n da
te
Rub
iace
aeD
amna
cant
hus i
ndic
us G
aertn
.f. v
ar. i
ndic
usA
ridos
hiC
entra
l Ryu
kyus
, Oki
naw
a Is
land
s, Ih
eya-
jima,
Mt.
Kay
o-sa
n. (M
. Kug
ai s.
n., R
YU
6327
)A
ug 2
9, 1
970
Psyc
hotr
ia ru
bra
(Lou
r.) P
oir.
Boc
hoji
Sout
hern
Ryu
kyus
, Miy
ako
Isla
nds,
Miy
ako-
jima.
(T. I
to 1
68, T
NS3
8240
6)A
ug 9
, 189
4R
utac
eae
Citr
us ta
chib
ana
(Mak
ino)
Tan
aka
Tach
iban
aN
TSo
uthe
rn R
yuky
us, Y
aeya
ma
Isla
nds,
Yona
guni
-jim
a.
(S. H
atus
ima,
Y. M
iyag
i & E
. Nak
ata
3580
9, R
YU
1468
5)Se
pt 2
9, 1
973
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, Yo
nagu
ni-ji
ma.
(S
. Hat
usim
a, Y
. Miy
agi &
E. N
akat
a 35
517,
RY
U15
847)
Sept
29,
197
3
Gly
cosm
is c
itrifo
lia (W
illd.
) Lin
dl.
Han
a-sh
inbo
giSo
uthe
rn R
yuky
us, M
iyak
o Is
land
s, Ta
ram
a-jim
a. (Y
. Miy
agi s
.n.,
RYU
3742
4)Se
pt 2
6, 1
975
Zant
hoxy
lum
bee
chey
anum
K.K
och
Iwa-
zans
hoC
entra
l Ryu
kyus
, Am
ami I
slan
ds, T
okun
o-sh
ima.
(Y. J
otan
i & S
. Mas
uda
s.n.,
TNS8
2550
2)Ju
ly 1
1, 1
973
Cen
tral R
yuky
us, A
mam
i Isl
ands
, Tok
uno-
shim
a. (Y
. Jot
ani &
S. M
asud
a s.n
., TN
S825
515)
July
11,
197
3Sc
hoep
fiace
aeSc
hoep
fia ja
smin
odor
a Si
ebol
d et
Zuc
c.B
orob
oron
oki
Sout
hern
Ryu
kyus
, Yae
yam
a Is
land
s, K
oham
a-jim
a. (K
. Shi
njo
& Y
. Tat
eish
i 109
54, U
RO
1128
73)
Mar
26,
199
8Sm
ilaca
ceae
Smila
x br
acte
ata
C.P
resl
var
. ver
rucu
losa
(Mer
r.) T
.Koy
ama
Ara
gata
-san
kira
iC
entra
l Ryu
kyus
, Oki
naw
a Is
land
s, Ie
-jim
a. (S
. Hat
usim
a &
Y. M
iyag
i 374
00, R
YU
2189
8)M
ay 4
, 197
4
Tabl
e. 1
. C
ontin
ued.
Goro Kokubugata et al.82
the Ryukyus, Taiwan, China and Indochina (e.g., Hatusima, 1975; Walker, 1976; Tateishi et al., 2018a). Therefore, further studies are required to understand the taxonomy of the plants from the Ryukyus and in particular from Iheya-jima.
Enhalus acoroides (L.f.) Rich. ex Steud. (Hydrocharitaceae; RL2019: VU; Fig. 3C)
This submerged growing seagrass has been reported from Ishigaki-jima, Iriomote-jima and Yonaguni-jima in the Yaeyama Islands; and is widely distributed from Indochina to Australia and Africa (Yokota and Yasuda, 2018). Some populations of this species are known from Ishi-gaki-jima and Iriomote-jima, while the present status of population in Yonaguni-jima is not clear (Yokota and Yasuda, 2018).
We report a new locality from Kohama-jima in the Yaeyama Islands. Kohama-jima is situated between Ishigaki-jima and Iriomote-jima, and treated as one of the Sekisei Lagoon Islets with other eight islets (Chinen, 1993). Given this find-ing, we suspect that this species may occur on other islets in the Sekisei Lagoon Islets too.
Torenia concolor Lindl. (Linderniaceae; RL2019: EN; Fig. 3D)
This trailing perennial herb was previously reported from Amami-ohshima, Uke-jima, Oki-nawa-jima in the central Ryukyus, and Miyako-jima in the southern Ryukyus; and from Taiwan, China, Southeast Asia, India and Sri Lanka (Ohashi, 2017). We confirmed that several popu-lations persist on Amami-ohshima by our recent field survey conducted in 2019, but we could not confirm the population on Kikai-jima in our field survey conducted in 2017 (details not shown). It is likely that the populations on Okinawa-jima and Miyako-jima in the Ryukyus have become extinct (Tateishi et al., 2018b).
We report a new record of this species from Kikai-jima, which is the third record from the Amami Islands in the central Ryukyus. However, this species may have come from a population that is now extirpated, as we did not find any other plant of this species during our detailed
surveys on Kikai-jima conducted in 2009 (details not shown). Some taxonomists treat the Ryukyus plants as T. concolor var. formosana Yamazaki distributing in only the Ryukyus and Taiwan (Tateishi et al., 2018b). Therefore, comparative surveys including plants from Southeast Asia, India and Sri Lanka are necessary to understand its taxonomic status.
Pericampylus formosanus Diels (Menisperma-ceae; RL2019:CR; Fig. 4A)
This perennial vine was previously reported from only Miyako-jima in the southern Ryukyus; and from Taiwan and southern part of China (Hatusima, 1975), but the present status of this species on the Miyako population is unclear (Shinjo and Kawakami, 2018).
We report a new record of this species from Ishigaki-jima, which is the second record from Japan at island level.
Nymphoides coreana (H.Lév.) H.Hara (Menyantha-ceae; RL2019: VU; Fig. 4B)
This floating aquatic has been reported from Miyako-jima, Ishigaki-jima, Iriomote-jima, Kayama-jima, and Yonaguni-jima in the southern Ryukyus; from Honshu, Shikoku, and Kyushu of Japan, Korea and China (Tateishi et al., 2018c). The present status of populations in Miyako-jima are not clear, while some populations of this spe-cies are known from the reminder islands (Tatei-shi et al., 2018c).
We report a new locality for this species on Irabu-jima, which is the second recorded occur-rence from the Miyako Islands.
Jasminum superfluum Koidz. (Oleaceae; RL2019: VU; Fig. 4C)
This woody vine has been reported from Kikai-jima, Yoron-jima, Okinawa-jima in the central Ryukyus, Miyako-jima, Irabu-jima, and Ishigaki-jima in the southern Ryukyus; and from Taiwan (Hatusima, 1971). This species was also found from Sesoko-jima of the central Ryukyus (Shimabuku, 1973).
We report a locality from Iheya-jima being an
New Localities of Plants from the Ryukyus 83
Fig. 2. Voucher specimen for new record at island level in the subtropical Ryukyus. A. Deeringia polysperma (Amaranthaceae; RYU). B. Rhus javanica var. javanica (Anacardiaceae; RYU). C. Conyza leucantha (Astera-ceae; RYU). D. Cordia aspera subsp. kanehirae (Boraginaceae; RYU). Scale bars = 3 cm.
Goro Kokubugata et al.84
Fig. 3. Voucher specimen for new record at island level in the subtropical Ryukyus. A. Fimbristylis tashiroana (Cyperaceae; TNS). B. Eriocaulon truncatum (Eriocaulaceae; URO). C. Enhalus acoroides (Hydrocharita-ceae; RYU). D. Torenia concolor (Linderniaceae; RYU). Scale bars = 3 cm.
New Localities of Plants from the Ryukyus 85
Fig. 4. Voucher specimen for new record at island level in the subtropical Ryukyus. A. Pericampylus formosanus (Menispermaceae; TNS). B. Nymphoides coreana （Menyanthaceae; RYU). C. Jasminum superfluum (Ole-aceae; RYU). D. Ludwigia adscendens (Onagraceae). Scale bars = 3 cm.
Goro Kokubugata et al.86
islet adjacent to Okinawa-jima, which is the third occurrence from the Okinawa Islands. Taxonom-ically, Hatusima (1975) treated the Ryukyus plants as J. sinensis Hemsl. distributed in the Ryukyus and southern part of China. Thus, fur-ther taxonomic studies based on the plants from the Ryukyu, Taiwan and China are required.
Ludwigia adscendens (L.) H.Hara (Onagraceae; RL2019: VU; Fig. 4D)
This hydrophyte herbaceous species has been reported from Okinawa-jima in the central Ryukyus, the Daito Islands, the Miyako Islands, and Ishigaki-jima in the southern Ryukyus; and is widely distributed in Taiwan and tropical areas of Asia (Hatusima, 1975). Populations on the Miyako Islands have declined because of anthro-pogenic activities, and only one population is known from Ishigaki-jima in the Yaeyama Islands (Yokota et al., 2018b).
We report a new locality of this species on Kohama-Jima, which is the second record for the Yaeyama Islands. Given this finding on Kohama-jima, we suspect that this species may also occur on other islets in the Sekisei Lagoon Islets.
Acknowledgments
This study was supported by a project of “Bio-logical Properties of Biodiversity Hotspots in Japan” conducted by the National Museum of Nature and Science, Tokyo.
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