A New Species of Sicydium Schlechtendal (Cucurbitaceae: Zanonioideae, Zanonieae, Sicydiinae)for the Flora MesoamericanaAuthor(s): Rafael LiraSource: Novon, Vol. 5, No. 3 (Autumn, 1995), pp. 284-286Published by: Missouri Botanical Garden PressStable URL: http://www.jstor.org/stable/3392267 .

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A New Species of Sicydium Schlechtendal (Cucurbitaceae: Zanonioideae, Zanonieae, Sicydiinae) for the

Flora Mesoamericana

Rafael Lira Herbario Nacional de Mexico, Departamento de Botinica, Instituto de Biologia, UNAM,

Apdo. Postal 70-367, Delegaci6n Coyoac~in, 04510, Mexico, D.F.

ABSTRACT. Sicydium daviliae, from the region of Ocozocuautla, Chiapas, Mexico, is described as new. It can be distinguished from the other species in the genus by the presence of a soft and dense

pubescence composed of long, multicellular, non-

glandular hairs covering stems, blade surfaces, pet- ioles and tendrils, by filaments 2-3 times longer than anthers, by petal margins entire, and by sta- minate pedicels articulate at the middle or further

up.

RESUMEN. Se describe como nueva especie a Si- cydium daviliae, de la regi6n (te Ocozocuautla, Chiapas, Maxico. Esta nueva especie se distingue de las otras especies del g~nero por la pubescencia densa y suave, compuesta de tricomas largos, mul- ticelulares y no glandulares, la cual cubre los tal- los, ambas superficies de la lamina, los peciolos y los zarcillos, asf como tambidn por presentar fila- mentos 2-3 veces mas largos que las anteras, p&- talos con los margenes enteros y pedicelos estam- inados articulados en la mitad o poco mas arriba.

As a result of examination of herbarium speci- mens for the treatment of Sicydium for Flora Me- soamericana, one specimen was found whose sta- men and vestiture features set it apart as a new

species, described below.

Sicydium daviliae Lira, sp. nov. TYPE: Mexico.

Chiapas: Mpio. Ocozocuautla, Camino Horizon- te a Santa Laura, 12 June 1983, F Vdzquez B. 1024 (male plant) (holotype, XAL). Figure 1.

Sicydio tamnifolio (HBK) Cogniaux similis, sed differt staminum filamentis quam antheris 2-3 plo longioribus, foliorum, caulium, petiolorumque indumento densiore, tri- chomatibus longis apice non glandularibus constato, pe- talorum marginibus integris, florum masculorum pedicellis in parte media vel altiore articulatis.

Herbaceous vine, perennial, dioecious, drying yellowish green; stems, petioles, upper and lower surfaces, and tendrils densely pubescent to tomen- tose, with long (1-2 mm), soft multicellular, non-

glandular hairs. Stems angulate-sulcate. Petioles

angulate-sulcate, 1-1.5(-2) cm long; blades

subcoriaceous, ovate-cordate, 3.5-5.5 cm long, 3- 5 cm broad, entire, apex acute to shortly acuminate, margins entire to slightly undulate-dentate, basal sinus cordate. Tendrils simple. Flowers small, ar-

ranged in loose panicles. Staminate panicles 4-6 cm long, the branches commonly with a reduced leaf in the axils; pedicels filiform, 1-1.3 mm long, articulate at the midlle or a little above the midldle, subtended by a lanceolate reduced leaf; receptacle disk-shaped, less than 0.2 mm long, 1-1.2 mm wide, puberulent; sepals 5, triangular, ca. 0.6 mm

long, 0.3 mm wide, puberulent; petals 5, ovate-lan- ceolate, spreading, greenish cream or greenish white, 1-1.3 mm long, 0.5-0.6 mm wide, puberu- lent, the margins entire; stamens 3, totally free, two with bithecial anthers, one with a monothecial an- ther; filaments inserted in the base of the recepta- cle, 0.4-0.6 mm long, slightly bent inward, forked toward the apex in the stamens with bithecial an- thers; anthers oblong-elliptic, 0.2-0.3 mm long, opening by a longitudinal suture. Plants with pis- tillate flowers and fruits unknown.

Sicydium daviliae is known only from the type, collected in the Municipio Ocozocuautla, Chiapas, Mexico, growing in disturbed tropical rainforest at 900 m, on sandy, clayish, and rocky soils.

The approximately eight species of Sicydium are distributed in the Neotropics. They have been tra-

ditionally distinguished mainly on the basis of sta- men structure, and presence/absence and distri- bution of vestiture (Cogniaux, 1881, 1916; Dieterle, 1976; Jeffrey & Trujillo, 1992; Nee, 1993; Schle- chtendal, 1832; Wunderlin, 1978). So far, three

species were found in Mexico-Mesoamerica: S.

tamnifolium (HBK) Cogniaux, a species ranging from central Mexico to South America, and S. tuerckheimii J. Donell-Smith and S. schiedeanum Schlechtendal (= S. glabrum Standley & Steyer- mark), both ranging at least from southern Mexico to Central America.

NovoN 5: 284-286. 1995.

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Volume 5, Number 3 Lira 285 1995 Sicydium daviliae

A

2cm

C

/ F1 f//A 0.5 mm

Figure 1. Sicydium daviliae Lira. -A. Habit. -B. Staminate flower. -C. Comparison among the trichomes present on the leaves of S. daviliae (1), S. tuerckheimii (2), and S. tamnifolium (3). Based on type specimen F Vdzquez B. 1024 (XAL).

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286 Novon

Sicydium daviliae can readily be distinguished from the above-mentioned species by its unique combination of stamens with filaments 2-3 times

longer than the anthers; petals with entire margins; a dense, soft indument made up of long, multicel- lular, nonglandular hairs; and staminate pedicels that are articulate at or above the middle. In con- trast, Sicydium tamnifolium includes populations with leaf blades, stems, and petioles (lensely an(I softly pubescent, I)ut the pubescence is less (lense an(I the hairs are much shorter and gland-tippedl. In a(I(Iition, the stamens of S. tamnifolium have

very short or obsolete filaments, the petal margins are somewhat fimbriate or laciniate, an(I the pedi- (els of the staminate flowers are articulate near the

I)ase. A species with a similar vestiture to that of Si-

cydium daviliae is S. araguenfse Steyermark & Tru-

jillo from Venezuela (Jeffrey & Trujillo, 1992). However, in S. araguense the stems are only pu- Iherulent with age, in adlult leaves the pubescence is not as ~iense or soft, an(I the leaf blades are nar-

rowly lanceolate an( longer. The new species is name(I to honor Patricia Dfivila, Mexican agrostol- ogist.

A KI: "" 10 ll' MI',XIcAN/MENSoAMEIIIcAN SII:CIiEs o)1.

la. Plants essentially glabrous or only slightly pu- Ierulent: leaves always unlobed, usually lustrous in both surfaces; filaments 2-2.5 times longer than anthers ....... S. schiedeanum Schlechtendal

lb. Plants conspicuously soft-puberulent, pubescent, or tomentose at least on the lower surface of the leaves; leaves unlobed to angulate or slightly lo- bate, not lustrous; filaments obsolete to 3 times longer than anthers. 2a. Leaves puberulent and rough-scabrous on

the upper surface, densely and softly pubes- cent on the lower surface, the pubescence commonly dark reddish brown when dry; fil- aments 2-3 times longer than anthers . . .

.......... S. tuerckheimii J. Donell-Smith 21. Leaves pubescent, puberulent to tomentose

on both surfaces, the pubescence yellowish

or whitish in dry specimens; filaments ob- solete to 2-3 times longer than anthers. 3a. Plants puberulent to villous, the vesti-

ture mainly of glandular hairs; filaments obsolete; margins of the petals slightly fimbriate or laciniate: pedicels of the staminate flowers articulate near the base .... S. tamnifolium (H1K) Cogniaux

31. Plants densely and softly pubescent to

tomentose, the vestiture mainly of non- glandular hairs; filaments 2-3 times longer than anthers; margins of the pet- als entire; pedicels of the staminate flowers articulate in the middle or slightly above . . .

...... S. da1iae Lira

Acknowledgments. I thank the (lurators of BM, BR, CHAPA, ENCB, F, HUH, K, LL, MICH, MO, NY, P. TEX, US, and XAL for allowing me to review collections of Sicydium, especially Sergio Avendaiio

(XAL) for making available the specimen on which the (lescription of the new species is base(I. Eloisa Duarte prepare(I the excellent

(Irawings, and I)avid

Sutton (BM), Fernando Chiang, an(i two anonymous reviewers (omlmente(I critically on the

manus'ript; Fernan(ho Chiang also prepare(I the English version of the paper, as well as the latin (Iiagnosis.

literature Cited

Cogniaux. A. 1881. Cucurbitacues. PIp. 325-951 in A.

de Candolle & C. ole Candolle (editors). Monographhiae I'hanerogamarum. G. Masson. Paris.

1916. Cucurbitaceae-Fevilleae et Melothrieae. Pp. 1-277 in A. Engler (editor). I)as Pflanzenreich. Regni Vegetabilis Conspectus. Verlag von Wilhelm En- gelmann, Leipzig.

I)ieterle, J. V. A. 1976. Cu'urbitaceae.

In: Flora of Gua- temala. Part XI. Fieldiana Iot. 24: 306-395.

Jeffrey, C. & B. Trujillo. 1992. Cucurbitaceae. Pp. I1- 201 in G. Morillo (editor). Flora de Venezuela. londo Editorial Acta Cientifica Venezolana. Caracas. Venezue- la.

Nee, M. 1993. Cucurbitaceae. In: V. Sosa (editor). Flora de Veracruz. Fasciculo 74. Instituto de Ecologfa A.C./ University of Riverside, Xalapa. Veracruz.

Schlechtendal, D. F. L. 1832. l)e Plantis Mexicanis. lin- naea 7: 380-400.

Wunderlin, R. P. 1978. Cucurbitaceae. In: R. E. Wood- son, Jr. & R. W. Schery (editors), Flora of Panama. Part IX. Ann. Missouri Bot. Gard. 65: 285-366.

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