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''Roscoea cangshanensis'' is a perennial herbaceous plant native to the mountains of China, being found in Yunnan. Most members of the ginger family (Zingiberaceae), to which it belongs, are tropical, but ''R. canshanensis'', like other species of ''Roscoea'', grows in much colder mountainous regions.〔 ==Description== ''Roscoea cangshanensis'' is a perennial herbaceous plant. Like all members of the genus ''Roscoea'', it dies back each year to a short vertical rhizome, to which are attached the tuberous roots. When growth begins again, "pseudostems" are produced: structures which resemble stems but are actually formed from the tightly wrapped bases (sheaths) of its leaves.〔 Plants of ''R. cangshanensis'' are usually 22–30 cm tall, with three or sometimes four leaves. The hairless (glabrous) leaf blade is usually 7–24 cm long by 1.5–2.5 cm wide, but may be as short as 2 cm. It narrows at the base, becoming almost like a stalk (petiole). There is a small ligule, about 1.5 mm long, at the junction of the blade and sheath.〔 In its native habitats, ''R. cangshanensis'' flowers between July and August. The stem (peduncle) of the flower spike is hidden by the leaf sheaths. The yellowish-green bracts which subtend the flowers are very short, only 5–15 mm long. Each spike has two or three flowers, which are reddish purple to pale purple.〔 Each flower has the typical structure for ''Roscoea'' (see the diagrams in that article). There is a tube-shaped outer calyx, 5.5–7 cm long with a two-toothed apex, which is pale green to white. Next the three petals (the corolla) form a long tube, 10–12.5 cm in length, terminating in three lobes, a narrow upright central lobe, 1.5–2.5 cm long by 8–12 mm wide, and two somewhat narrower side lobes, 1.5–2.5 cm long by 3–4 mm wide. Inside the petals are structures formed from four sterile stamens (staminodes): two lateral staminodes form what appear to be small upright petals, about 1.2 cm long by 7 mm wide; two central staminodes are fused at the base to form a lip or labellum, 2.5–3.5 cm long by 2.5–3 cm wide. The labellum bends backwards and is deeply split into two lobes, each divided again. The base of the labellum is marked with narrow white lines.〔〔 The single functional stamen has a white anther, about 6 mm long, with approximately 3 mm long spurs formed from the connective tissue between the two capsules of the anther. The ovary is about 1.2 cm long.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Roscoea cangshanensis」の詳細全文を読む スポンサード リンク
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