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Stachys floridana
''Stachys floridana'' is a species of betony in the mint family, Lamiaceae. It is native to the United States, where its true native range is probably limited to Florida, but today it is known throughout the Southeast as an introduced species and common weed.〔(''Stachys floridana''. ) Germplasm Resources Information Network (GRIN).〕〔Czarnota, M. and T. Murphy. (Controlling Florida Betony in the Landscape. ) C 867-11. College of Agricultural and Environmental Sciences, University of Georgia. 2012.〕 It occurs as far west as Texas,〔 and it has been recorded in California.〔Weaver, R. (Weed of the Month, February, 2010: ''Stachys floridana'', Florida Betony, Rattlesnake Weed. ) Florida Department of Agriculture and Consumer Services, Division of Plant Industry.〕 Its common names include Florida betony,〔 Florida hedgenettle,〔(''Stachys floridana''. ) USDA PLANTS.〕 and rattlesnake weed.〔 It has been called wild artichoke, but it is not closely related to artichoke.〔Burgess, C. (Florida Betony. ) Home and Garden Information Center. Clemson University Cooperative Extension. 2005, revised 2008.〕 The plant was the Florida Department of Agriculture's "Weed of the Month" for February 2010.〔
==Description==
This species is a perennial herb producing a hairy, erect stem up to about half a meter in maximum height. It grows from a network of rhizomes with tubers. The distinctive pale-colored tuber is several centimeters long and about one centimeter wide, and is segmented in such a way that it resembles the rattle on the tail of a rattlesnake,〔Hall, D. W., et al. (Florida Betony, ''Stachys floridana'' Shuttlew. ) Weeds in Florida (SP 37). Florida Cooperative Extension Service, University of Florida IFAS. 1991, revised 2006.〕 the inspiration for the common name "rattlesnake weed".〔 The tuber is also said to resemble "a fat grub".〔(Florida Betony (''Stachys floridana''). ) North Carolina State University Cooperative Extension.〕 The tuber can reportedly grow up to one meter long in sandy soils.〔 The oppositely arranged leaves have blades up to 5.5 centimeters long borne on petioles up to 3.5 centimeters long. Flowers grow in clusters of 3 to 6 from the upper leaf axils. The tubular, hairy calyx of sepals has pointed lobes. The two-lipped corolla is up to 1.3 centimeters long〔 and white to pink with purple spots〔(Florida Betony or Rattlesnake Weed: ''Stachys floridana''. ) Virginia Tech Weed Identification Guide.〕 or darker lines.〔 The fruit is a schizocarp a few centimeters long that splits in half. The seeds are about a millimeter long.〔
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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