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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).