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(Last Modified On 2/4/2013)
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(Last Modified On 2/4/2013)
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Species
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ONCIDIUM CHEIROPHORUM Rchb. f.
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PlaceOfPublication
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Bot. Zeit. 10:695. 1852.
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Synonym
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Oncidium Dielsianum Krinzl. in Engler, Pflanzenr. IV, Fam. 50 (Heft 80):197, t. I7, fig. F; a-b. 1922.
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Description
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Dwarf, caespitose, epiphytic herbs averaging 12-15 cm. in height, with ovoid to suborbicular, compressed, monophyllous or rarely diphyllous pseudobulbs 1.5-3 cm. long and 1.4-2.5 cm. wide, at first smooth, often becoming finely wrinkled with age, the bases enveloped in several imbricating bracts the uppermost 2 or 3 of which are conspicuously foliaceous. Leaves linear-ligular, obtuse to subacute, pergameneous, 5-15 cm. long and 0.8-1.4 cm. wide, contracted below into short, conduplicate petioles. Inflorescences 1 or 2 slender, erect or arching, densely paniculate scapes usually exceeding the leaves, up to about 30 cm. in length, produced from the lateral bases of the pseudobulbs. Flowers small, averaging 1-1.5 cm. in diameter, bright yellow and fragrant. Sepals of about equal length, the dorsal sepal erect, shortly clawed at the base, the orbicular blade deeply concave, often with a minute apicule, about 5 mm. long and 4 mm. wide, the lateral sepals elliptic-obovate, obtuse, often reflexed, apparently very shortly connate at the base, 5-6 mm. long and 3-3.5 mm. wide. Petals shortly clawed, spreading, obovate-spatulate, obtuse, about 4-5 mm. long and 4 mm. wide. Lip conspicuously 3-lobed, averaging about 8 mm. long and 12 mm. wide, the sessile base adnate to the base of the column, the broadly spreading, auriculate, lateral lobes subquadrate to suborbicular, usually with reflexed margins, the central portion of the lip with an abrupt, narrow constriction, the mid-lobe transversely subreniform or 2-lobed, the lobules often porrect in natural position, the disk with a prominent, fleshy keel, the upper margins with 2 conspicuous subquadrate wings, between which at the apex there is a short membranaceous hood or concavity. Column very short, with large obovate, usually porrect, lateral wings, the base produced in front into a prominent, erect, fleshy horn. Anther with a long beak, otherwise typical of the genus.
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Distribution
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Costa Rica, Panama, and Colombia.
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Specimen
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COCLE: El Valle de Anton, 500-1000 m., D. Allen 3987, Hunter C Allen 350, Allen 236, 1681, 2914, 2939, 4211. CHIRIQUI: without definite locality, 5000 ft., Powell 54; Volcancitos, 5500 ft., Davidson 1261; Piedra de Lino, 1600 m., Killip 3571; valley of the upper Rio Chiriqui Viejo, near Monte Lirio, 1300-1900 m., Seibert 224; trail from Paso Ancho to Monte Lirio, Rio Chiriqui Viejo, 1500-2000 m., Allen 1499.
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Note
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A small-flowered, dwarf, but attractive species very common in the highlands of Cocle and Chiriqui provinces in our area, where the plants often form dense clumps in the tops of tall trees or on the ends of spreading branches, often fully exposed to the sun.
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