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Dahlia imperialis
''Dahlia imperialis'' or Bell tree dahlia is an 8-10 metre tall member of the Dahlia genus native to Mexico, Central America and Colombia. It is a plant of the uplands and mountains, occurring at elevations of , and its leaves are used as a dietary supplement by the Q'eqchi' people of San Pedro Carchá in Alta Verapaz, Guatemala.
It is a tuberous, herbaceous perennial, rapidly growing from the base after a dormant winter period, developing brittle, cane-like, 4-angled stems with swollen nodes and large tripinnate leaves, those near the ground soon being shed. The pendant or nodding flowerheads are 75-150mm across with ray florets lavender or mauvish-pink in colour.〔http://www.sciencedirect.com/science/journal/08891575〕
This species is fast-growing, the growth spurt being linked to shorter daylight hours, and usually comes into flower in autumn before the first frost. Propagation is by seed or by stem cuttings of some long having at least two nodes, laid horizontally below the soil.〔http://www.strangewonderfulthings.com/105.htm〕
Some ''Dahlia'' species were brought from Mexico to Europe in the 16th century. ''D. imperialis'' was first described in 1863 by Benedikt Roezl (1823–1885), the great Czech orchid collector and traveller, who, ten years later in 1872–73, went on his odyssey through the Americas.〔http://www.ipni.org/〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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