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178 FIELDIANA: BOTANY, VOLUME 28 versely cuneate-trapeziform with a broad truncate-concave apex when viewed from above. Column of the genus (Fig. 30). Type in Herb. Ames no. 64847, isotype in herb. Chi. Nat. Hist. Mus., no. 1221980, rich forest on slopes near summit of Cerro San Isidro, above La Carbonera, state of Me'rida, alt. 2430-2745 m., April 22, 1944, Julian A. Steyermark 56034, "epiphyte on trunk of Ladenbergia undata, leaves fleshy subcoriaceous, dull green above, pale below"; same data, Steyermark 56031. This species appears to be allied to the Ecuadorian Stelis lancea Lindl., but differs in its very unequal sepals and simple lip. Lepanthes exilis C. Schweinfurth, sp. nov. Herba epiphytica, caespitosa. Caules numerosi, pertenues, apice unifoliati, pluriarticulati, vaginis arctis glabris tubulatis omnino tecti. Folium lanceolatum vel elliptico-lanceolatum, acuminatum cum apice acriter tridenticulato, breviter petiolatum. Inflorescentiae axillares, saepissime plures, diffusae, multiflorae, quam folium plusminusve longiores. Flores parvi, membranacei, glabri. Sepalum dorsale ovatum, acutum, concavum. Sepala lateralia in laminam late ovatam profunde bidentatam connata. Petala perparva, transverse oblonga cum lobo posteriore subquadrato-oblongo comparate longo et lobo anteriore minuto, triangular!. Labellum petala subaequans, 3- lobatum; lobi laterales comparate magni, late flabellati; lobus medius minutus, villosus. Columna generis. Plant epiphytic, caespitose. Roots fibrous, glabrous, filiform, numerous. Rhizome abbreviated. Stems numerous, very slender, 1-leaved at the apex, several- (up to 14-) jointed, entirely concealed by close tubular glabrous sheaths which terminate in ovate spreading marginate, minutely hispid mouths, about 5 (rarely) -13 cm. long. Leaf very shortly petioled; lamina lanceolate to elliptic -lanceolate (often narrowly so), coriaceous, acuminate to a sharply tridenticulate apex, shortly cuneate below, 3*1-6.5 cm. long, up to 1.3 cm. or less wide; petiole about 5 mm. or less long. Inflorescences axillary, solitary to about 15, diffuse, laxly or subdensely many-flowered, surpassing the leaf (sometimes nearly three times as long). Floral bracts minute, infundibuliform. Flowers very small, membranaceous. Sepals distinctly connate below, tawny yellow with pale yellow margins. Dorsal sepal ovate, acute, concave, 3-nerved, up to 4 mm. long and 2.2 mm. wide when expanded. Lateral sepals with their inner margins connate to half their length, each sepal very obliquely ovate, acute, 2-nerved; lamina of lateral sepals broadly ovate, about 3.4 mm. long from the outer point of union with the dorsal sepal to the tip and 2.9 mm. wide near the base. Petals much smaller than the sepals, vermilion-orange, transverse, bilobed, about 0.8 mm. long and 1.9 mm. wide; posterior lobe much the larger, oblong-subquadrate with a very oblique obtuse apex; anterior lobe very small, triangular, obtuse. Lip adnate to the middle of the column, 3-lobed, orchid-rose; lateral lobes relatively large, broadly flabellate, the apex broadened
BOTANICAL EXPLORATION IN VENEZUELA - I 179 FIGURE 30 Stelis dispar. 1, Plant (X 3/5>, 2, Flower, from the front (X 8); 3, Petal (X 16); 4, Lip, from above (X 16); 5, Lip, from die side (X 16).
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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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