A New Dalechampia L. (Euphorbiaceae) from Southern Costa RicaAuthor(s): Jorge Gómez-LauritoSource: Novon, Vol. 10, No. 4 (Winter, 2000), pp. 368-370Published by: Missouri Botanical Garden PressStable URL: http://www.jstor.org/stable/3392988 .

Accessed: 11/06/2014 08:35

Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at .http://www.jstor.org/page/info/about/policies/terms.jsp

.JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range ofcontent in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new formsof scholarship. For more information about JSTOR, please contact support@jstor.org.

.

Missouri Botanical Garden Press is collaborating with JSTOR to digitize, preserve and extend access toNovon.

http://www.jstor.org

This content downloaded from 195.34.78.11 on Wed, 11 Jun 2014 08:35:07 AMAll use subject to JSTOR Terms and Conditions

A New Dalechampia L. (Euphorbiaceae) from Southern Costa Rica

Jorge Gdmez-Laurito Escuela de Biologia, Universidad de Costa Rica, Ciudad Universitaria 2060,

San Jost, Costa Rica

ABSTRACT. A new species of Dalechampia L. (Eu- phorbiaceae) with 5-foliolate leaves is described from southern Costa Rica, compared with its closest relative, and illustrated.

RESUMEN. Una nueva especie de Dalechampia L. (Euphorbiaceae) con hojas 5-folioladas, se describe de la regi6n sur de Costa Rica, se compara con otra especie cercana y se ilustra en este artfculo.

Dalechampia L. is a genus of about 115 mostly neotropical species (Burger & Huft, 1995). Eleven species have recently been accounted for in Costa Rica (Burger & Huft, 1995). Except for D. spathu- lata (Scheidweiler) Baillon, an erect subshrub, the Costa Rican taxa are clambering vines with leaves that vary from simple and unlobed, with 5 palmate veins, to 2-3-lobed, and to trifoliolate. A new Dal- echampia with 5-foliolate leaves from southern Cos- ta Rica is described below.

Dalechampia burgeriana G6mez-Laurito, sp. nov. TYPE: Costa Rica. Puntarenas. Coto Brus, Fila Cruces, entrada de los Atunes y or- illa de la quebrada, borde de bosque, pasti- zales y charrales, 1000-1200 m, 24 July 1995, Isidro Chacdn 279 (holotype, USJ; isotypes, CR, F, MO). Figure 1.

Dalechampia regnellii species brasiliensis affinis, a qua imprimis differt basi asymmetrici foliolorum lateralium, stipulis involucralibus 8-10 mm longis, bracteis involu- cralibus majoribus, sepalis pistillatis 12, ovario glabro, fructu majore.

Clambering vines, leafy stems 1-1.3 mm thick, with retrorse appressed hairs and spreading sting- ing bristles 1-1.5 mm long; stipules 8-10 mm long, 1.5-2 mm wide at the base, narrowly lan- ceolate, ciliate along the margin, with 6-7 as- cending veins, persisting. Leaves 5-foliolate, pet- ioles 3-10 cm long, ca. 1 mm thick with retrorse appressed hairs and spreading trichomes, stipels stipule-like; petiolules 3-10 mm long with an- trorse appressed hairs; leaflets with blades 6.5- 10.5 cm long, 2-2.5 cm wide, narrowly elliptic- oblong to narrowly ovate-elliptic, apex acuminate, margin with short teeth, lateral leaflets asymmetric

at the base with a rounded-truncate side and a cuneate side, sparsely pilose on both surfaces, es- pecially on the veins beneath; venation pinnate with 7-8 pairs of major secondary veins. Inflores- cence axillary, solitary on axillary short-shoots 4- 7 cm long; short-shoots with retrorse appressed hairs and 1-3 reduced leaves, involucral stipules 8-10 mm long, 1.5-2 mm wide at the base, nar- rowly lanceolate, pilose along the margin, with 6- 7 ascending veins; involucral bracts 4-5.5 cm long, 3-3.5 cm wide, ovate and 5-lobed, yellowish green, with 7-9 major veins from base, the veins sparsely ciliate outside and strigillose with short appressed hairs on the inner surface, the margin ciliate and with short teeth. Staminate cymules pe- dunculate, peduncules 3-5 mm long, flattened, sparsely pubescent, involucel cupuliform, 2.5-4 mm long, 6-8 mm wide, with the bracts complete- ly connate; pedicels 3-6 mm long; resiniferous bractlets laminar, margins entire, secreting sticky whitish resin; staminate flowers 8-9; bud oblong- elliptic, 2 mm long, 1-1.2 mm broad, acute at tip; calyx lobes 4, becoming reflexed, staminal column 2 mm long, glabrescent, anthers ca. 12, crowded, subsessile, 0.8 mm long, bilocular and dehiscent longitudinally. Pistillate cymules sessile, involucel of 2 bractlets; bractlets glabrous, margins sinuate, densely ciliate with hairs to 1 mm long; pistillate flowers 3, very short-pedunculate at anthesis; pe- duncles ca. 1 mm long; sepals 12, 3-4.5 mm long, 1-1.5 mm broad, bipinnatifid, margins hispid; ovary ca. 2 mm high, 1.5 mm thick, glabrous, 3- locular; stylar column straight, terete, 12-15 mm long, 0.5 mm thick, glabrous, cream-colored, tip slightly dilated and sometimes slightly down- turned. Central fruiting-pedicel 2-2.5 cm long, laterals 10-12 mm long; fruiting sepals 12-16 mm long, margins, tentacular processes, and midstrip copiously beset with straight, sharp bristles 1-2 mm long. Capsule 12-14 mm diam., glabrous; col- umella 12-15 mm long, persisting; seeds globose, ca. 4 mm diam., rugose-verrucate, whitish, pale- red tinged.

This new species is named in honor of William C. Burger, long-time friend and devoted student of

NovoN 10: 368-370. 2000.

This content downloaded from 195.34.78.11 on Wed, 11 Jun 2014 08:35:07 AMAll use subject to JSTOR Terms and Conditions

Volume 10, Number 4 2000

G6mez-Laurito Dalechampia burgeriana from Costa Rica

369

i.. FL_ i: ::: : ??'~:':d

f:~ ?;I

.i:i

i? ?.1

ji I ?.? i ~?::' ;~:?

?' ~ ~?Y!;~ ~?.~. i

: :i .li.?.. :....: ?i:

~fl.? ~~~:~: '~~ii~?i,~.i?? ? ?i. s?

.... diX ~~C~;:?i:

4i ? ? ̀:?.??-??~-~ .?r ?I\~ 1~7t~ ?i;.'?~ i~,??`?'~? ? '- B

I: : la I I

,:I ' ?G~U:I

i i ??. ~i:

,, I ~: :: i:. :: I ::::: :: ;IF :.?

:::' I:; :: i. . ? ?iF, ?

? : C. I: ?::.I?

: ~X~:?':. I r

:Y I,. .XU~ P) :: ~ a-U,? ::

~ .i : 5: :? ? ~-?'~e: ?i

~~:~:' ' ?'-' .?'.'.?~??'?~ ~?r~:::I~l~--

~_~-~L~-I-L~L~C~ILL~.~i_~~l I--I~~( I~~Y~CIJ~I-fj~~:~?:?-:I-:: ???.l~::i~ir?:i~li:~ff~:?jj:_::(?: :_(::~:~:~:j~. """;;~;;;;;;~-;--`-~-` ~T~ij~

,'

:.i ? k ? I I-?-~~? 1cm

:? i:???:I I I r??. ~?: ' i"~"~';::~::~:?~?--.:?'~:~?::: "?:~ 9~~1;-.~ `i?.

,?~ "''"??

;?-???. i;' ;:1?1??:???;~; -~T?C~CL ?I-~r~-~:ri:;~?- :??????~ \J-r ~~?-?. ~I?I-:?,:?.?"~??:' i~ 'Y?\

~~d~rl 1~ ?::I-:. 'm~ ?)- I: A. I ,-...?... ?;; .. '" ' ' ? ::?

Figure 1. Dalechampia burgeriana G6mez-Laurito (I. Chacdn 279). -A. Habit. -B. Inflorescence at anthesis. -C. Staminate and pistillate cymules.

Costa Rican plants. His contributions to our knowl- edge of the Costa Rican flora have already been significant through his Flora Costaricensis publi- cations.

Dalechampia burgeriana, with its 5-foliolate leaves, involucel of completely connate bracts, and

resiniferous bractlets of staminate pleiochasium with entire margins belongs to section Dalechampia subsect. Triphyllae as delimited by Webster and Armbruster (1991). Dalechampia burgeriana may be related to D. regnellii Mueller-Argoviensis, an- other species with 5-foliolate leaves, from southern

This content downloaded from 195.34.78.11 on Wed, 11 Jun 2014 08:35:07 AMAll use subject to JSTOR Terms and Conditions

370 Novon

Brazil (Pax & Hoffmann, 1919; Webster & Arm- bruster, 1991). However, D. burgeriana differs from D. regnellii in having lateral leaflets asymmetric at the base, involucral stipules only 8-10 mm long, stipels similar to the stipules, involucral bracts 4- 4.5 cm long, pistillate flowers with 12 sepals, gla- brous ovary, and capsule 12-14 mm in diameter vs. lateral leaflets cuneate at base, involucral stip- ules 25 mm long, stipels reduced or subulate, in- volucral bracts 2.5 cm long, pistillate flowers with 10 sepals, pubescent ovary, and capsule 8 mm in diameter in D. regnellii. Dalechampia burgeriana is known only from the type locality, at the edge of premontane forest, in the subtropical, tropical very wet biotic unit with 1-2 dry months, according to Herrera and G6mez (1993).

Acknowledgments. I thank Michael H. Grayum (MO) and an anonymous reviewer for critically re- viewing the manuscript and Carmen Marin for the illustration.

Literature Cited

Burger, W. C. & M. Huft. 1995. Euphorbiaceae. In Flora Costaricensis, Fieldiana Bot. new ser. 36: 1-169.

Herrera, W & L. D. G6mez. 1993. Mapa de unidades bi6ticas de Costa Rica. Escala 1: 685.000. Instituto Geograifico de Costa Rica.

Pax, F. & K. Hoffmann. 1919. Euphorbiaceae-Dalecham- pieae. In A. Engler (editor), Das Pflanzenreich IV. 147. XII (Heft 68): 1-59.

Webster, G. L. & W. S. Armbruster. 1991. A synopsis of the neotropical species of Dalechampia (Euphorbi- aceae). Bot. J. Linn. Soc. 105: 137-177.

This content downloaded from 195.34.78.11 on Wed, 11 Jun 2014 08:35:07 AMAll use subject to JSTOR Terms and Conditions