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''Chloracantha'' is a monotypic genus of flowering plants in the aster family, containing the single species ''Chloracantha spinosa''. It is distributed in the southwestern and south-central United States (CA NV AZ UT NM TX OK LA),〔(Biota of North America Program 2013 county distribution map )〕 most of Mexico, and much of Central America.〔(''Chloracantha spinosa''. ) Germplasm Resources Information Network (GRIN).〕 Its English language common names include spiny chloracantha, spiny aster, devilweed aster, and Mexican devilweed.〔(''Chloracantha spinosa''. ) Integrated Taxonomic Information System (ITIS).〕 In Spanish it is known as ''espina de agua'', ''espinaza'', and ''espinosilla''.〔(''Chloracantha spinosa''. ) Tropicos. Missouri Botanical Garden.〕 This species is a perennial herb or subshrub; its green stems look more herbaceous than woody, "but it behaves more like a subshrub",〔(''Chloracantha''. ) Flora of North America.〕 with its tough stems living for several years and rapidly developing vascular cambia. The stems are hairless and sometimes waxy in texture, and some of the lateral branches may be sharply angled and reduced in size, becoming thorns. The alternately arranged leaves persist for only a short time and then fall away. Large colonies of these bare stems proliferate from a robust rhizomes. The stems usually reach a maximum height around 1.5 meters, but can well exceed 2 meters at times. They bear loose arrays of many flower heads each roughly half a centimeter long and wide. The head is lined with layers of hairless phyllaries. It contains up to 33 coiling white ray florets and many yellow disc florets. The fruit is a cypsela with a pappus of many barbed bristles.〔 This plant is known from dry habitat and moist spots, such as streambanks and seeps. It tolerates some saline habitat types.〔(''Chloracantha spinosa'' var. ''spinosa''. ) The Jepson eFlora 2013.〕 ;varieties〔 # ''Chloracantha spinosa'' var. ''spinosa'' # ''Chloracantha spinosa'' var. ''jaliscensis'' (McVaugh) S.D. Sundb. 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「Chloracantha」の詳細全文を読む スポンサード リンク
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