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FOC | Family List | FOC Vol. 24 | Costaceae | Costus

2. Costus oblongus S. Q. Tong, Acta Phytotax. Sin. 27: 291. 1989.

长圆闭鞘姜 chang yuan bi qiao jiang

Stems 1.8--3 m. Leaf sheaths green, apex densely white pubescent and white long ciliate; leaf blade subsessile, elliptic or lanceolate-elliptic, 18--33 × 6--14 cm, adaxially glabrous, abaxially densely villous, base rounded or cuneate, apex acuminate. Inflorescences terminal, ovoid or broadly so, 4--13 × 3--9 cm; bracts bright red, oblong, 2.8--4 × 1.2--1.6 cm, densely villous, apex breaking into fibers when old; bracteoles pink, narrowly oblong, plicate, ca. 3.2 cm. Calyx pink, ca. 2 cm, densely pubescent, apex 3-toothed; teeth acute and ciliate at apex. Corolla tube white, ca. 1 cm; lobes subequal, central one elliptic, ca. 4.5 × 2.2 cm, apex red spotted. Labellum white, trumpet-shaped, 5--6 cm in diam., margin crisped. Stamen elliptic, ca. 4.5 × 1.5 cm; anther narrowly elliptic, inserted distally on stamen. Ovary red, densely white hairy. Fl. Aug.

* Forest margins; ca. 1200 m. S Xizang, W Yunnan.


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