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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 ISTHMI Schltr.
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PlaceOfPublication
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Fedde Rep. Sp. Nov. Beih. 17:84. 1922.
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Description
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Robust, erect, epiphytic herbs with approximate, narrowly ovoid to linear- oblong, compressed, longitudinally ridged, usually diphyllous pseudobulbs 8.5-12 cm. long and 3-4 cm. wide, the lower portions enveloped in the conduplicate, distichously imbricating bases of 6-7 bracts, the uppermost 4-5 of which are conspicuously foliaceous. Leaves and bract blades linear-lanceolate, acute, subcoriaceous, 15-45 cm. long and 1.5-3.2 cm. wide, the foliaceous bracts articulated near the base, with a distinct suture, the blades ultimately deciduous. Inflorescences 1 or 2 erect or arching, many-flowered panicles up to about 1 m. in length, produced from the lateral bases of the pseudobulbs. Flowers of moderate size, 2.5-3 cm. long and 1.5-2.2 cm. wide. Sepals free, spreading, clawed at the base, yellow barred with brown, the dorsal sepal elliptic-oblong, acute, with undulate margins, 9-12 mm. long and 4-5 mm. wide, the lateral sepals obliquely oblong, subacute, with undulate margins, 10-13 mm. long and 4-5 mm. wide. Petals rather obliquely oblong, subacute, with undulate margins, yellow barred with brown, 10-12 mm. long and 4-5 mm. wide. Lip panduriform, 3-lobed, bright yellow, the small auriculate, lateral lobes subquadrate to suborbicular, the frontal margins abruptly contracted into a narrow central isthmus, the mid-lobe broadly dilated and 2- lobed, transversely reniform, occupying about 2/3 of the total length of the lip, the disk brown, with an erect, compact, 7-toothed basal callus. Column short, about 4 mm. long, with prominent lateral wings.
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Distribution
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Costa Rica and Panama.
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Specimen
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CANAL ZONE: San Juan, upper Chagres River, sea level, Powell 397. PANAMA: with- out definite locality, sea level, Fairchild s. n.; vicinity Pacora, sea level, Allen 3442. DARIEN: Rio Sambul, 200 m., Pittier 5569.
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Note
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Robust lowland epiphytes, vegetatively nearly identical with 0. panamense and 0. Baueri but readily distinguished by the larger, conspicuously expanded mid- lobe and the much narrower isthmus of the lip.
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