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FOC | Family List | FOC Vol. 24 | Costaceae

1. Costus Linnaeus, Sp. Pl. 1: 2. 1753.

闭鞘姜属 bi qiao jiang shu

Costus speciosus

Credit: B. Hammel

Rhizomes horizontal, tuberous. Stems sometimes branched, usually spirally twisted, leafy, rarely plants stemless. Leaf blade oblong to lanceolate. Inflorescences terminal or lateral on separate, short, leafless shoots arising from rhizomes, conical, densely many flowered; bracts imbricate, 1- or 2-flowered. Calyx 3-lobed or -toothed at apex. Corolla tube equaling or longer than calyx. Labellum obovate, large, margin incurved. Stamen petaloid; anther locules linear. Ovary 3-loculed; ovules many per locule, superposed. Style filiform; stigma funnelform. Stylodes absent. Capsule subglobose or ovoid, woody. Seeds many, black; aril lacerate.

About 90 species: tropical and subtropical regions; five species (two endemic) in China.

1 Inflorescences arising from rhizomes near base of leafy shoots; peduncle 4--13 cm; leaf blade glabrescent on both surfaces   1 COSTUS tonkinensis
+ Inflorescences borne at apex of leafy shoots; leaf blade densely hairy abaxially.   (2)
2 (1) Leaf blade densely villous or hirsute abaxially; apex of bracts not sharply pointed, breaking into fibers when old.   (3)
+ Leaf blade densely sericeous abaxially; apex of bracts sharply pointed, not breaking into fibers when old.   (4)
3 (2) Labellum white; bracts oblong; bracteoles narrowly oblong; calyx teeth acute at apex; stamen elliptic, apex not convex   2 COSTUS oblongus
+ Labellum pink; bracts ovate or broadly so; bracteoles ovate; calyx teeth rounded at apex; stamen oblong, apex convex   3 COSTUS lacerus
4 (2) Labellum white; bracts red; stamen urceolate; calyx red, apex with a reddish black, rigid, densely sericeous point   4 COSTUS speciosus
+ Labellum pink; bracts green; stamen oblong; calyx green, apex with a golden, rigid, glabrescent point   5 COSTUS viridis

Lower Taxa


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