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PLANT FAMILY: Costaceae
BOTANICAL NAME: Cheilocostus tonkinensis
FORMAL SCIENTIFIC NAME: Costus tonkinensis Gagnep.
Asian Costus, may be an obsolete synonym, part of the "Costus globosus complex". It is listed as an accepted species on The Plant List: "The record derives from WCSP which reports it as an accepted name (record 234801?) with original publication details: Bull. Soc. Bot. France 49: 248 1902." They still have it listed under the genus Costus.
Described in Flora of China, Vol. 24 (Flagellariaceae-Marantaceae). Science Press & Missouri Botanical Garden.
Costus tonkinensis Gagnepain, Bull. Soc. Bot. France 49: 248. 1902.
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Stems 2-4 m. Branchlets spirally twisted. Leaf blade obo-vate-oblong, 12-20 Ã— 4-8cm, glabrescent, base attenuateor sub-rounded, apex acute. Inflorescences arising from rhizomes, glo-bose or ovoid, ca. 8 cm in diam.; peduncle 4-13 cm; bracts imbricate, oblong, 2.5-4.5 cm, apex sharply pointed; bracteoles 1-1.4 cm, apex sharply pointed. Flowers yellow. Calyx ca. 3 cm, apex slightly widened, 3-toothed; teeth acute at apex. Corolla longer than calyx; lobes linear-lanceolate, subequal, ca. 3.2 cm. Labellum trumpet-shaped, 5-6 cm, base slightly narrowed, margin crisped. Stamen yellowish, petaloid, apex emarginate. Ovary 3-angled. Capsule globose, ca. 1 cm in diam. Seeds black. Fl. Jul-Aug, fr. Sep-Nov. 2n = 18*.
Forest floors. Guangdong, Guangxi, Yunnan [Vietnam].