|
''Roscoea bhutanica'' is a perennial herbaceous plant native to the mountains of Bhutan and Tibet. Formerly regarded as part of ''Roscoea tibetica'', it was recognized as a separate species in 2000. Most members of the ginger family (Zingiberaceae), to which it belongs, are tropical, but ''R. bhutanica'', like other species of ''Roscoea'', grows in much colder mountainous regions.〔 ==Description== ''Roscoea bhutanica'' 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.〔 ''R. bhutanica'' is one of the smaller members of the genus; plants are 8–14 cm tall, with around four to eight or more leaves, the first two to four being bladeless, the others with smooth (glabrous) blades 4–21 cm long by 1–1.6 cm wide. The leaves are clustered together at the base.〔 The stem (peduncle) of the flower spike is hidden by the leaf sheaths. Bracts some 4.5–8 cm long by 1–1.6 wide enclose the flowers, which are purple and appear one at a time, just above the leaves.〔 Each flower has the typical structure for ''Roscoea'' (see the diagrams in that article). There is a tube-shaped outer calyx, 5–6.5 cm long with a two-toothed apex. Next the three petals (the corolla) form a tube which is usually about 1 cm longer than the calyx at 5–6.5 cm and terminates in three lobes, a narrow upright central lobe, about 2.3–2.6 cm long and 1.1–1.3 cm wide, and two narrower side lobes, each 2.4–2.8 cm long by 4–6 mm wide. Inside the petals are structures formed from four sterile stamens (staminodes): two lateral staminodes form what appear to be narrow upright petals, 1.6–1.9 cm long; two central staminodes are fused to form a lip or labellum, about 2.5–3.2 cm by 1.6–2 cm, which is slightly bent downwards and divided into two lobes for less than half its length.〔〔 The single functional stamen has a white anther, about 6–7 mm long, above pointed spurs formed from the connective tissue between the two capsules of the anther. The style is pinkish-white with a white stigma. The ovary is about 1–1.7 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 bhutanica」の詳細全文を読む スポンサード リンク
|