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(Last Modified On 2/7/2013)
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(Last Modified On 2/7/2013)
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Species
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ONCIDIUM PANDURIFORME A. & S.
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PlaceOfPublication
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Sched. Orch. 8:77. 1925.
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Description
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Erect, caespitose, epiphytic herbs 35-55 cm. tall, with distichous foliage, the conduplicate, imbricating bases enveloping a small, linear to narrowly ovoid, com- pressed, 1- or 2-leaved pseudobulb 5-7 cm. long and 0.8-2 cm. wide, the plants reminiscent of those of Oncidiurn ochinatochilum. Leaves linear-lanceolate, acute, subcoriaceous, rather coarsely veined, the blades up to about 40 cm. long and 1.5-3 cm. wide. Inflorescences usually solitary, stout, erect or arching, many- flowered panicles much exceeding the leaves, up to about 1 m. in length, produced from the axils of the foliaceous bracts, the terminal portion and the lateral branches usually distinctly fractiflex. Flowers rather small, averaging about 2 cm. in diameter. Sepals subequal, free, spreading or strongly reflexed, yellowish brown with yellow apices, the dorsal sepal lanceolate, acute, 9-12 mm. long and 2.5-3 mm. wide, the lateral sepals linear-lanceolate, acute, 10-12 mm. long and 2-2.5 mm. wide, the reverse surfaces with prominent central keels. Petals usually broader than the sepals, similarly colored, elliptic-lanceolate, acute, spreading or reflexed, 9-10 mm. long and 4-5 mm. wide. Lip pandurate, obscurely 3-lobed, white, 9-12 mm. long and 8-10 mm. wide, the lateral lobes small and rounded or obtusely triangular, the anterior margins converging to form a short, broad isthmus, the mid-lobe abruptly dilated, spreading, transversely semiorbicular, the under-surface at the apex with a short, strongly developed keel terminating in an apicule, the disk with a low, fleshy, obscurely tricarinate callus at the base. Column about 5 mm. long, without lateral wings but with 2 pronounced, parallel, marginal thickenings on the under-surface below the stigma.
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Distribution
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Costa Rica and Panama.
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Specimen
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CHIRIQUI: vicinity Bajo Chorro, headwaters of the Rio Caldera, 1900 m., Woodson & Schery 704.
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Note
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Apparently closely allied to Oncidium ochmatochilum, but differing in the obscure, lateral lobes of the lip, and the much less complexly developed basal callus.
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