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158 FIELDIANA: BOTANY, VOLUME 28 It is with hesitancy that a new species in this genus is described from a vegetative state only, but the plant from the summit of Duida differs vegetatively from other species as follows: the broader and longer leaves which are glabrous on the upper surface and only subglabrate to minutely pilosulous in the sulcations between the nerves on the lower surface, the appressed-hirsute basal margins of the leaves, and the relatively tall thick stems which vary from 1.3- 1 .8 meters in height. Vellozia duidae is locally common in the Savana Hills, and forms a striking appearance with its tall subligneous stems giving rise at the tip to the long leaves. These stems are much taller than in V, tubiflora H.B.K. of the lowlands of the Upper Orinoco in Venezuela, and have much broader and longer leaves than either V. tubiflora or V. Alexandrinae (Schomb.) Goeth. & Henr. of the Gran Sabana region bordering Roraima, Auyan-tepui' and Ptari-tepui. In those species, moreover, and especially in V. Alexandrinae, the leaves are densely appressed-silvery-sericeous-pubescent beneath. The chances are great that V. duidae, geographically isolated as it is on the summit of Duida, will be found to possess additional characters as a distinct species when its flowers are eventually collected and described. DIOSCOREACEAE Dioscorea bolivarensis Steyermark, sp. nov. Caules teretes, glabri; laminis membranaceis cordato-ovatis acuminatis, 4-6 cm. longis, 3-3.5 cm. latis, 7-nervatis glabris; petiolis 1.5-1.8 cm. longis; paniculis masculis paniculato-ramosis, 10-15 cm. longis; racemulis 2.5-3.5 cm. longis; floribus plerumque binis vel trinis fasciculatis pedicellatis; pedicellis 1-2 mm. longis glabris; bracteis ca. 1 mm. longis ovatis acuminatis; perianthio 2 mm. lato rotate; segmentis lineari-oblongis 1.5 mm. longis, 0.5-0.8 mm. latis, tubo brevi; sta minibus fertilibus 6, perianth ii tubo insert is; fi lame mis elongatis. Type in herb. Chi. Nat. Hist. Mus., collected along rocky cascades of Rio Upaca, west of Upata, state of Bolivar, alt. 500 m., July 31, 1944, Julian A. Steyermark 57551. The paniculately branched staminate inflorescence relates this species to section Sarcantha Uline, as treated by R. Knuth in Das Pflanzenreich (IV. 43: 247. 1924), and to D. amazonum Griseb. in that section, but that species has very elongated staminate branches of the inflorescence and the flowers are solitary, whereas in D. bolivarensis the flowers are in pairs or in cy mules of threes, and much smaller. Dioscorea Lasaeriana Steyermark, sp. nov. Caules usque 2.5-* mm. crassi, hirtello-pubescentes, pilis patulis obsiti; laminis firmiter papyraceis ovato-oblongis, cordato-ovatis
BOTANICAL EXPLORATION IN VENEZUELA - I 159 vel subrotundatis, apice subiter cuspidatis, basi sinu latissimo cordate, adultis 8.5-10 cm. longis, 5.5-9 cm. lads, subtus villosis, supra glabris, 7-9-nervatis venis , prominence reticulatis, praesertim subtus; petiolis 3-4 cm. longis hirtellis; racemis masculis fasciculatis pluribus in axilla folii, usque 15-20 cm. longis, 1-1.5 mm. crassis, villosis, rhachi et floribus et pedicellis villosis; fasciculis subsessilibus 1-1.5 mm. longis, 2-4-floris; pedicellis 3-6 mm. longis, villosis, perianthio 1.8-2 mm. longo, villoso, usque ad 4/5 partito; segmentis lanceolato-oblongis, obtusis, extus villosis; staminibus 6, centralibus; filamentis recurvatis, basi in tubum coalitis; antheris suborbicularibus brevioribus quam filamentis. Type in herb. Chi. Nat. Hist. Mus., collected on meadowy slopes between La Sabana de las Piedras and Cerro Negro, northwest of Caripe, state of Monagas, alt. 1200-1500 m., April 5, 1949, Julian A. Steyermark 61836; also collected in woods above Las Cuadras, along Quebrada Molino, north of Torondoy, state of Me'rida, alt. 1820- 2255 m., March 27, 1944, Steyermark 55802. A member of subgenus Helmia (Kunth) Benth., sect. Dematostemon Griseb., as treated by R. Knuth in Das Pflanzenreich IV. 43: 50-51. 1924, this species, because of its staminate flowers villous on the outer surface, is related to D. Fendleri R. Knuth of Venezuela, but differs from that species in having villous stems and the lower surface of the leaves villous. It is also closely related to D. sericea R. Knuth of Colombia, from which it differs in the much longer pedicels of the staminate flowers, the acuminate or cuspidate leaf-tips, and the loosely villous instead of villous-sericeous pubescence of the lower surface of the leaves. Dioscorea sororopana Steyermark, sp. nov. Volubilis glabra; caulibus tenuibus subteretibus; foliorum laminis firmiter membranaceis vel subcoriaceis late ovatis, subito acuminatis, basi sinu latissime cordato, adultis 4-8 cm. longis, 3.5-6 cm. latis, glabris, 7-1 3-nervatis nervis , extremis furcatis, subtus conspicuoribus et laxe areolatis; petiolis 1.5-4 cm. longis; inflorescentia mascula spicata; spicis masculis simplicibus solitariis vel 2-fasciculatis, 8-9 cm. longis, glabris angulatis, longioribus quam foliis; floribus masculis 2-3-glomerulatis, sessilibus; glomerulis 1-3 mm. remotis; bracteis ovatis cuspidatis, 2.5 mm. longis; perianthio masculo campanulato, 2-2.5 mm. longo, segmentis subaequalibus, suborbiculari-ovatis, rotundatis vel obtusis, 1.5 mm. longis, 0.75-1 mm. latis, paullo longioribus quam tubo; staminibus 3, tubi fundo insertis, subcentralibus erectis, 1 mm. longis; filamentis 0.7-0.8 mm. longis; spicis fructiferis 10 cm. longis, 4 capsulas gerentibus; capsulis suborbicularibus vel subreniformibus 17-18 mm. longis, 18-19 mm. latis; seminibus undique alis circumcinctis, 9 mm. longis, 5-6 mm. latis, late oblongis, semine ipso suborbiculari 3-4 mm. longo. Type in herb. Chi. Nat. Hist. Mus., collected by wooded streamlet,
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o 2 CM XI E> RAR.Y OF THL UNIVERSIT
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FIELDIANA: BOTANY A Continuation of
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NUMBER 1 LIST OF ILLUSTRATIONS TEXT
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PAGE 67. Emmotum ptarianum 342 68.
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CONTRIBUTIONS TO THE FLORA OF VENEZ
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