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''Acianthus'' is a small genus of 9 known species, 8 endemic in Australia and 1 in New Zealand, from the orchid family (Orchidaceae). ''Acianthus'' was once circumscribed to include about twice as many species, but the additional species have now been redistributed to other genera, such as ''Acianthella''.〔''A complete Guide to Native Orchids of Australia, including the island territories'', p. 161. David L. Jones. 2006. New Holland Publishers, Frenchs Forest, N.S.W. 2086 Australia. ISBN 1-877069-12-4.〕 The name is derived from the Greek words ''achis'' (point) and ''anthos'' (flower), referring to the pointed sepals. Common Australian names include "Pixie-caps," "Gnat Orchid," and "Mosquito Orchid." ''Acianthus'' species occur in Australia and New Zealand, in small groups in forests on decaying litter, or occasionally on partially decayed logs or in association with bracken fern. These terrestrial orchids have small, globular, subterranean tubers from which the flower stems arise. They form dense vegetative colonies, in sheltered forest or heathland, and are often found underneath shrubs and bracken. There is a single, heart-shaped, clasping leaf, often with purple markings, near the base, held horizontally above the soil. The flowers often resemble mosquitoes. These orchids produce a terminal raceme, arising from near the center of a solitary leaf, bearing pinkish or greenish flowers with a long spur. There are small flowers (4 to 5 mm), blending in with the surroundings. They are pollinated by small gnats seeking the nectar from the unlobed labellum.〔 == Species == *''Acianthus apprimus'' Early Mosquito Orchid (NSW Blue Mountains to New England highlands). *''Acianthus borealis'' Northern Mosquito Orchid (Qld. Mt. Windsor Tableland to Blackdown Tableland). *''Acianthus collinus'' Inland Mosquito Orchid (NSW slopes of Great Darling Range between Taree and Crowther; ACT Black Mountains). *''Acianthus exiguus'' Tiny Mosquito Orchid (NSW Repton to Wardell). *''Acianthus exsertus'' Gnat orchid (E. & SE. Australia). (type species). *''Acianthus fornicatus'' Pixie-caps (E. Australia). *''Acianthus ledwardii'' Ledward's Mosquito Orchid (SE. Queensland) (Extinct). *''Acianthus pusillus'' Small Mosquito Orchid (Qld. n. to Eungella, NSW, Victoria, Tasmania). *''Acianthus sinclairii'' (New Zealand - incl. Stewart I.), Chatman Is., Kermadec Is.) 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「Acianthus」の詳細全文を読む スポンサード リンク
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