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''Rudbeckia hirta'', commonly called black-eyed-susan, is a North American species of flowering plants in the sunflower family, native to the Eastern and Central North America and naturalized in the Western part of the continent as well as in China. It has now been found in all 10 Canadian Provinces and all 48 of the states in the contiguous United States.〔(Biota of North America Program 2014 county distribution map )〕〔〔(Flora of China, 黑心菊 hei xin ju, ''Rudbeckia hirta'' Linnaeus )〕 ''Rudbeckia hirta'' is one of a number of plants with the common name black-eyed susan. Other common names for this plant include: brown-eyed susan, brown betty, gloriosa daisy, golden Jerusalem,〔Dolgopolov, Y. (2004). ''A collection of confusable phrases: False 'friends' and 'enemies' in idioms and collocations.'' Coral Springs, FL: Llumina Press.〕〔http://www.collinsdictionary.com/dictionary/english/niggerhead〕 English bull's eye, poor-land daisy, yellow daisy, and yellow ox-eye daisy. ''Rudbeckia hirta'' is the state flower of Maryland.〔("MARYLAND AT A GLANCE: STATE SYMBOLS, Maryland State Flower - Black-Eyed Susan", Maryland State Archives, Maryland Manual Online )〕 The plant also is a traditional Native American medicinal herb in several tribal nations;〔Moerman. D. (1998). ''Native American Ethnobotany.'' Timber Press. Oregon. ISBN 0-88192-453-9.〕 believed in those cultures to be a remedy, among other things, for colds, flu, infection, swelling and (topically, by poultice) for snake bite (although not all parts of the plant are edible)〔 Parts of the plant have nutritional value. Other parts are not edible. ==Description== ''Rudbeckia hirta'' is an upright annual (sometimes biennial or perennial) growing tall by wide. It has alternate, mostly basal leaves 10–18 cm long, covered by coarse hair, with stout branching stems and daisy-like, composite flower heads appearing in late summer and early autumn. In the species, the flowers are up to in diameter, with yellow ray florets circling conspicuous brown or black, dome-shaped cone of many small disc florets.〔(Floridata: ''Rudbeckia hirta''. )〕 However, extensive breeding has produced a range of sizes and colours, including oranges, reds and browns.〔 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「Rudbeckia hirta」の詳細全文を読む スポンサード リンク
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