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190 FIELDIANA: BOTANY, VOLUME 28 tri- vel quadriarticulati ec vaginis pluribus tubulatis arete omati. Folia perangusta, oblongo- vel elliptic o-linearia, apice acuto minute tridenticulata, basi breviter petiolata. Inflorescentiae abbreviatae, uniflorae, subaxillares, in fascicule utroque flores plures ut videtur. Flores parvi, membranacei, flavidi, glabri. Sepala petalaque persimilia, elliptico-lanceolata, acuminata, trinervia. Labellum multo brevius, infra medium trilobatum, cum lobis lateralibus parvis, rotundacis, suberectis et lobo intermedio multo majore, apice acuto vel tridentato. Columna parva, leviter arcuata. Plant epiphytic, tall for the genus. Rhizome creeping, apparently elongate, entirely concealed by close tubular sheaths which waste away during development. Roots fibrous, filiform, glabrous, apparently growing in scattered clusters. Secundary stems slender, 1- leaved at the apex, up to 2 cm. apart on the rhizome, subparallel with the rhizome or growing at a right angle from a decumbent base, 3- to 4-jointed, adorned at intervals with three to five close tubular evanescent sheaths, about 8-20 cm. long. Leaf rigidly erect or ascending, short-petioled; lamina oblong-linear or elliptic-linear, acute with a minutely tridenticulate apex, cuneate below, 11.7-19.5 cm. long, up to 1 cm. wide; petiole sulcate, about 7 mm. long. Inflores censes subaxillary, abbreviated, 1-flowered, apparently with several flowers in each fascicle. Flowers small, membra naceous, glabrous, with creamy yellow sepals and petals and pale yellow lip. Dorsal sepal elliptic-lanceolate, acuminate, 3-nerved, about 8.4 mm. long and 2.5 mm. wide. Lateral sepals free, very similar to the dorsal sepal but slightly narrower (1.5 mm. wide), slightly oblique. Petals ellipticlanceolate, acuminate, about 7 mm. long and 2.2 mm. wide, 3-nerved, Lip much shorter than the other segments, oblong-obovate in outline in natural position, 3-lobed below the middle, about 3*7 mm. long and 2 mm. across the lateral lobes when expanded, cuneate at base, pandurate-constricted on each side in the middle, acute and unequally 3-angled or tridentate in front; lateral lobes relatively very small, erect-incurved in natural position, rounded; disc with a pair of short distant keels extending from the middle of the lateral lobes to the dilated portion of the middle lobe. Column relatively small, gently arcuate, slightly narrowed above, about 2 mm. long at the back (Fig. 36). Type in herb. Ames no. 64842, isotype in herb. Chi. Nat. Hist. Mus., no. 1207006, along Quebrada Sororopan, between Santa Teresita de Kavanayen and Rio Tek-Yunsen, state of Bolivar, alt. 1375 m., December 3, 1944, Julian A. Steyermark 60830; cotype collected on forested sandstone south-facing slopes between plateau portion and "Cave Camp", Ptari-tepui, alt. 1700-1800 m., November 1, 1944, Julian A. Steyermark 59703, "leaves deep green above and paler green beneath, flowers (buds) greenish yellow". Another collection (Steyermark 59703), while furnishing only young buds, apparently represents this species. It differs in having some
BOTANICAL EXPLORATION IN VENEZUELA - I 191 OCTOMERIA FIGURE 36 Octomeria rhizomatosa. 1, Plant (X 1/3); 2, Flower, from the side (X 3); 3, Petal (X 3); 4, Dorsal sepal (X 3); 5, Lateral sepal (X 3); 6, Lip from above (X 7); 7, Column and lip from the side (X 7).
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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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BOTANICAL EXPLORATION IN VENEZUELA
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