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Project Name Data (Last Modified On 1/20/2013)

Flora Data (Last Modified On 1/20/2013)
Genus XYLOBIUM Lindl.
PlaceOfPublication Bot. Reg. 1: sub t. 897. 1825
Reference Benth. & Hook. Gen. Pl. 3:547. 1883.
Synonym Onkeripus Raf. Fl. Tellur. 4:42. 1836. Pentulops Raf. loc. cit. 1836.
Description Epiphytic herbs with short or elongate, ovoid or semiterete pseudobulbs, the bases enveloped in 2-4 papery, brown, imbricating bracts, the apices with 1-2 lanceolate, plicate, subcoriaceous, strongly veined, acute or acuminate leaves. In- florescences short or elongate, erect or arching racemes from the base of the pseudobulbs. Flowers few to many, on short pedicels, reminiscent of those of a small-flowered Maxillaria. Sepals subequal, membranaceous, spreading, the dorsal sepal free, the laterals broader, adnate to the foot of the column, forming a short mentum, the dorsal surface, particularly near the apex, usually with an erect central keel. Petals membranaceous, subequal to the dorsal sepal. Lip entire or 3-lobed, the lateral lobes or margins erect, the base articulated with the foot of the column; disk smooth, callused or with parallel prominent nerves or lamellae. Column short, erect, somewhat arcuate, semiterete, the apex subclavate or nar- rowly winged, the base produced into a foot. Anther terminal, operculate, incum- bent, 1-celled or imperfectly 2-celled; pollinia 2 or 4, waxy.
Note About 20 species of American epiphytes, found from southern Mexico to Peru and Brazil, and in the West Indies. The flowers considerably resemble those of some species of Maxillaria. However, the genus is amply separated by the racemose flowering habit and the plicate rather than coriaceous leaves. Three species are known from Panama.
Key a. Lip conspicuously 3-lobed. b. Lip densely papillose. Pseudobulbs elongate, semi-terete, diphyllous .... 1. X. ELONGATUM bb. Lip not papillose. Pseudobulbs ovoid, stout, di- or triphyllous ............ 2. X. FOVEATUM aa. Lip entire or obscurely 3-lobed. Pseudobulbs short, subcylindric, monophyllous or very rarely diphyllous ............................................ 3. X. POWELLII
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