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200 FIELDIANA: BOTANY, VOLUME 28 short, about 4 mm. high at the back, with a conspicuously beaked rosteUar process, provided above with a pair of broadly and transversely oblong petaloid wings and below with a pair of small refuse subquadrate plates (Fig. 40). Type in herb. Chi. Nat. Hist. Mus., no. 1204664, wooded quebrada in Montana of Ri'o Tachira at base of Paramo de Tama, between Betania and Tama, by Colombian-Venezuelan boundary, state of Bolivar, alt. 2430 m., July 13, 1944, Julian A. Steyermark 57180, "sepals and petals pafe yellow above, pale brown near base, lip pale yellow with pale brown blotches, crest of lip pale creamy yellow". This species seems to be allied to Oncidium pyramid ale Lindl., but has a lax open panicle, a much narrower mid-lobe of the lip and very dissimilar column-wings. Lockhartia latilabris C. Schweinfurth, sp. nov. Herba epiphytica, caespitosa. Caules rigidi, simplices, foliorum basibus irabricatis oranino tecti. Folia numerosa, disticha, equitantia, triangulari-oblonga, breviter acuta, valde adscendentia. Inf lore scent iae perbreves, pauciflorae. F lores pro genere grandes, flavi. Sepala elliptico-ovata. P eta la majora, elliptic o-obovata, antice late rotundata. Labellum simplex, suborbiculari-reniforme, leviter retusum, marginibus irregulariter denticulatis; discus medio calloso-incrassatus. Columna perbrevis, crassa. Plant epiphytic, caespitose, medium-sized for the genus. Roots numerous, fibrous, glabrous, filiform, more or less branched. Stems straight, up to 17 cm. high, entirely concealed by the imbricating bases of the leaves. Leaves very numerous, distichous, equitant, triangular-oblong or triangular-lanceolate, strongly ascending, shortly acute, often slightly incurved above, up to 2.3 cm. long on the outer margin and 5.5 mm. wide across the base. Inflorescences apparently solitary in several of the upper leaf-axils, subequaling the leaves. Floral bracts broadly ovate, acuminate, amplexicaul below. Flowers large for the genus, raembranaceous, pale yellow, the lip being spotted with orange-brown toward the center. Dorsal sepal elliptic-ovate, subacute at the rounded apex, 3-nerved, about 8.8 mm. long and 5 mm. wide. Lateral sepals similar but slightly broader, acute, concave below, slightly oblique. Petals larger than the sepals, elliptic-obovate, broadly rounded above, with slightly irregular margins, 3-nerved with the lateral nerves branching, about 10.8 mm. long and 7 mm. wide. Lip simple, noticeably broader than long, suborbicular-reniform, concave, lightly refuse, with irregularly denticulate margins (except near the truncate basal portion), about 10 mm. long on either side of the refuse center and 15 mm. wide; disc callose-thickened throughout the basal and central portions, the thickening appearing bilobed in the center and with lacerate margins. Column very short and stout with a semiovate wing having irregular margins on each side (Fig. 41).
BOTANICAL EXPLORATION IN VENEZUELA - I 201 FIGURE 40 Oncidium diffusum. 1, Plant (X 3/5); 2, Flower, three-quarter view (X 1-1/2); 3, Dorsal sepal (X 2>, 4, Petal (X 2); 5, Lateral sepal (X 2); 6, Column from the front, with wings expanded (X 2); 7, Lip from above (X 2).
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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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I BOTANICAL EXPLORATION IN VENEZUEL
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