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64. Tropidia Lindley, Edwards’s Bot. Reg. 19: ad t. 1618. 1833.

竹茎兰属 zhu jing lan shu

Authors: Xinqi Chen, Stephan W. Gale & Phillip J. Cribb

Chloidia Lindley; Cnemidia Lindley; Govindooia Wight; Muluorchis J. J. Wood; Schoenomorphus Thorel ex Gagnepain.

Herbs terrestrial, autotrophic [rarely mycotrophic outside Flora area]. Rhizome ascending, stout; roots wiry, fibrous. Stem erect, rigid, branched or unbranched, noded, with sheaths at nodes. Leaves 2 to many, plicate, ovate to narrowly lanceolate, base contracted into amplexicaul sheaths. Inflorescence a short raceme or panicle, terminal or arising from leaf axils near apex of stem, several or many flowered. Flowers resupinate or not. Dorsal sepal free; lateral sepals free or connate to form a synsepal and embracing base of lip. Petals free, similar to sepals or slightly smaller; lip cymbiform, slightly shorter than sepals, entire, with or without a short spur, sometimes constricted at middle, base loosely embracing column, distally expanded, apex acuminate and reflexed. Column short; anther dorsal, erect; rostellum prominent, erect, bifid after viscidium removed; pollinia 2, granular-farinaceous, sectile, with slender caudicle and peltate viscidium.

About 20 species: mainly in tropical and subtropical Asia, with a few species extending to Australia and the Pacific islands and one in Central and North America; seven species (three endemic) in China.

1 Leaves many, distichous, usually more than 10; lateral sepals connate only at base.   1 T. curculigoides
+ Leaves 1-5; lateral sepals connate for almost their entire length, forming a synsepal   (2)
2 (1) Lip spurred at base; spur to 4 mm.   2 T. angulosa
+ Lip saccate, concave-saccate, or inconspicuously concave at base   (3)
3 (2) Synsepal subtruncate at apex; column ca. 2 mm.   7 T. emeishanica
+ Synsepal bilobed at apex; column 3-6 mm   (4)
4 (3) Leaves 3-5; disk bearing a pair of rounded calli toward apex.   3 T. nanhuae
+ Leaves 1 or 2; disk without calli   (5)
5 (4) Leaves linear-lanceolate to narrowly ovate-lanceolate, 1.7-2.1 cm wide, apex acuminate.   4 T. angustifolia
+ Leaves ovate, cordate, elliptic, or ovate-lanceolate, 4-8 cm wide, apex acute   (6)
6 (5) Inflorescence racemose, laxly 10-20-flowered; sheaths on stem less than 2 cm.   5 T. somae
+ Inflorescence subglobose, densely 5-10-flowered; sheaths on stem to 4 cm.   6 T. nipponica

Lower Taxa


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