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J86 FIELDIANA: BOTANY, VOLUME 28 gustatum, coriaceum. Inflore scentiae axillares, pendulae vel reflexae, pluri-vel multiflorae. Floras comparate parvi, bilabiati, atropurpurei. Sepala membranacea. Sepalum dorsale lanceolatum vel ovato-lanceolatum, acuminatum. Sepala lateralia in laminam suborbicularem profunde concavam connata. Petala oblongo-lanceolata, longe acuminata, in positu natural! leviter incurva. Labellum parvum, in circuitu triangulari-ovatum, in positu natural! trilobatum cum lobis lateralibus basalibus obovato-semiorbicularibus et lobo terminal! triangular! acuminate. Columna parva. Plant large. Rhizome apparently abbreviated. Roots fibrous, pubescent, filiform, numerous. Stems approximate, rather slender, clothed in the lower part with about three distant close tubular sheaths which are evanescent in course of development, 41.5-65 cm. or more long (incomplete in the longest specimen), unifoliate at the apex, very rarely superposed. Leaf elliptic, abruptly acuminate with a tridenticulate tip and produced mucro, long-narrowed to a more or less petioled base, coriaceous, 15 - about 23 cm. long (longest blade incomplete), 5-7.1 cm. wide. Inflorescences axillary, one or two, nodding or recurved, subdensely several- to many-flowered, much shorter than the leaf, about 11 cm. or less in length. Floral bracts narrowly infundibuliform, abruptly acute. Flowers relatively small, deep wine-purple, bilabiate. Sepals membranaceous. Dorsal sepal lanceolate or ovate-lanceolate, acuminate, concave, 3-nerved, about 11 mm. long (tip incomplete), 4 mm. wide when expanded. Lateral sepals entirely connate into a deeply concave suborbicular lamina which is 6-nerved, about 10 mm. long and wide when partially expanded, subacute at the apex. Petals oblong-lanceolate, longacuminate, lightly incurved in natural position, rather fleshy, 3- nerved, about 10 mm. long and 2 mm. wide below. Lip relatively small, triangular -ovate in outline, abruptly re flexed at the base, 3-lobed in natural position with obovate-semiorbicular lateral lobes and triangular acuminate mid-lobe, subentire when expanded, deeply cordate at base, about 4.1 mm. long from the basal margin of a lateral lobule to the tip of the lip and subequally wide below; disc with a pair of nipple-shaped call! in the center of the base. Column short and stout, about 2 mm. high at the back, with a very short foot in front (Fig. 34). Type in herb. Chi. Nat. Hist. Mus., no. 1221987, isotype in Herb. Ames no. 64843, rich woods near and bordering Quebrada de Palmar, at foot of Pa'ramo de Tama', 2 kms. above Betania and 7 kms. above Villapaez, state of Tachira, alt. 2500 m., July 14, 1944, Julian A. Steyermark 57246, "leaves dark green above and dull green beneath, stems erect, dull green mottled with dark purple". This species appears to be allied to the Ecuadorian Pleurothalli* antennifcra Lindl., but lacks the abbreviated upper stem-member, has shorter racemes and broader petals.
BOTANICAL EXPLORATION IN VENEZUELA - I 187 PLEUROTHALLIS Sieyerrruvrkii FIGURE 34 Pleurothallis Steyermarkii. 1, Upper portion of plant (X 3/5); 2, Basal portion of plant (X 2/3); 3, Flower, from the side (X 3); 4, Petal (X 3); 5, Lip from above (X 6); 6, Lip from the side (X 6).
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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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