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FOC | Family List | FOC Vol. 25 | Orchidaceae

114. Otochilus Lindley, Gen. Sp. Orchid. Pl. 35. 1830.

耳唇兰属 er chun lan shu

Authors: Xinqi Chen & Jeffrey J. Wood

Tetrapeltis Wallich ex Lindley.

Herbs, epiphytic. Rhizome erect or pendulous. Pseudobulbs superposed, i.e., each pseudobulb arising near apex of previous pseudobulb, subcylindric, 2-leaved. Leaves petiolate, plicate, linear to elliptic, papery, acute. Inflorescence proteranthous or synanthous, pendulous, racemose, many flowered; rachis straight or weakly zigzag; floral bracts caducous at or after anthesis. Flowers resupinate, often white, with or without brown markings, or flesh-colored, small. Sepals free, narrowly lanceolate to linear-lanceolate. Petals linear-lanceolate to linear; lip with a saccate, bilobed hypochile and a much longer, narrow epichile, ecallose; lateral lobes of hypochile clasping base of column. Column incurved and dilated apically, without stelidia, foot absent; pollinia 4, with caudicles; stigma cup-shaped; rostellum large. Capsule ellipsoid, rostrate.

Four species: Bhutan, China, NE India, Myanmar, Nepal, Thailand, and Indochina; four species in China.

1 Flowers small, dorsal sepal less than 10 mm; anther cap and rostellum with a broad triangular front; floral bracts broadly obtuse   (2)
+ Flowers larger, dorsal sepal 12-20 mm; floral bracts ovate-lanceolate, apex triangular   (3)
2 (1) Leaves linear-lanceolate; hypochile lateral lobes longer than broad, edges somewhat erose, surface smooth, united by a transverse callus or ridge at distal side of their base, nearly closing access to hypochile sac; epichile attached well below transverse ridge; sac without internal keels; column uniformly slender, cylindric.   1 O. fuscus
+ Leaves ovate-lanceolate; hypochile lateral lobes not much longer than broad, outside finely papillose, transverse ridge absent; interior of sac with a thickened longitudinal ridge; column ventrally flattened throughout most of its length.   2 O. albus
3 (1) Lip epichile ovate-lanceolate, less than 1.5-3 × as long as broad; rostellum and anther cap rostrate; disk with 3 laminate keels extending from base of hypochile to base of epichile, 2 additional short keels on base of epichile; lateral lobes acute or obliquely truncate, slightly erose.   3 O. porrectus
+ Lip epichile narrowly lanceolate, 3-4 × as long as broad; rostellum and anther cap broadly triangular, obtuse; disk with 3 keels extending from base of hypochile which terminate ca. halfway up toward base of epichile; lateral lobes obtuse.   4 O. lancilabius

Lower Taxa


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