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Asclepias sullivantii
''Asclepias sullivantii'' is a species of flowering plant in the milkweed genus, ''Asclepias''. Common names include prairie milkweed, Sullivant's milkweed, and smooth milkweed.〔(''Asclepias sullivantii''. ) Missouri Botanical Garden.〕〔(''Asclepias sullivantii''. ) Lady Bird Johnson Wildflower Center. University of Texas, Austin.〕 It is native to North America, where it occurs in the central United States and Ontario in Canada.〔Penskar, M. R. and P. J. Higman. (Special plant abstract for ''Asclepias sullivantii''. ) Michigan Natural Features Inventory. Michigan State University Extension. 2000. Accessed 3 July 2012.〕
==Description==
This is a perennial herb growing from deep rhizomes. The stem is 40 centimeters to just over one meter tall. The ovate, pointed leaves are oppositely arranged. The blades have wavy margins, reddish midveins, and hairless undersides. They curve up on the stem. Pale to deep pinkish purple flowers are borne in rounded clusters from the leaf axils. The fruit is a greenish follicle. The flowers are insect-pollinated, but the plant often reproduces vegetatively via the rhizome.〔
This species is very similar to ''Asclepias syriaca'', the common milkweed, and the two easily hybridize. Common milkweed can be distinguished by several characters. Its blunt-tipped leaf blades have a coating of hairs on the undersides and are straight on the stem, not curving up. The flowers are smaller and more numerous, and the surface of the follicle is rougher.〔
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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