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Cosmos atrosanguineus : ウィキペディア英語版 | Cosmos atrosanguineus
''Cosmos atrosanguineus'' (Chocolate Cosmos) is a species of ''Cosmos'', native to Mexico, where it is extinct in the wild. The species was introduced into cultivation in 1902, where it survives as a single clone reproduced by vegetative propagation.〔(Encyclopedia of Life )〕 ''Cosmos atrosanguineus'' is a herbaceous perennial plant growing to 40–60 cm tall, with a fleshy tuberous root. The leaves are 7–15 cm long, pinnate, with leaflets 2–5 cm long. The flowers are produced in a capitulum 3-4.5 cm diameter, dark red to maroon-dark brown, with a ring of six to ten (usually eight) broad ray florets and a center of disc florets; they have a light vanillin fragrance (like many chocolates), which becomes more noticeable as the summer day wears on.〔()〕 ==Cultivation and uses== The single surviving clone is a popular ornamental plant, grown for its rich dark red-brown flowers. It is not self-fertile, so no viable seeds are produced, and the plant has to be propagated by division of the tubers, or by tissue culture.〔Huxley, A. (ed.) 1992. ''New RHS Dictionary of Gardening'' 1: 739. Macmillan.〕 It requires partial sun or full sun, and flowers from mid to late summer. It is frost-sensitive (Zones 6-11); in temperate zones, the tuber has to be dug up and stored in a frost-free store over the winter.
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「Cosmos atrosanguineus」の詳細全文を読む
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