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Asclepias purpurascens
Purple milkweed (''Asclepias purpurascens'') is a herbaceous plant species. It is in the genus ''Asclepias'', making it a type of milkweed. It is native to the Eastern, Southern and Midwestern United States similar to the range of the Common Milkweed (''Asclepias syriaca''). The plant gets its name from the flowers that first develop a pink color but then turn darker purple as they mature. Unlike Common Milkweed, Purple Milkweed prefers some shade and is considered a plant of partial shade. It is also considered an indicator of Oak savanna, especially in Wisconsin.〔http://pleasantvalleyconservancy.org/pdf/Purple%20milkweed%20paper.pdf〕 The species rarely produces seed pods which are smooth instead of the rough warty ones produced by Common Milkweed.〔http://www.newfs.org/docs/pdf/Asclepiaspurpurascens.pdf〕 Purple Milkweed is declining in some areas and listed as endangered in Wisconsin and Threatened in Massachusetts 〔http://www.fs.usda.gov/Internet/FSE_DOCUMENTS/fsm91_054165.pdf〕
==Uses==
Like other members of the milkweeds, several insects live off the plant, including the Monarch Butterfly (''Danaus plexippus''), the Milkweed beetle (''Tetraopes tetraophtalmus''), Large milkweed bug (''Oncopeltus fasciatus''), Small Milkweed Bug (''Lygaeus kalmii'') and Milkweed Leaf Beetle (''Labidomera clivicollis''). Other insects and pollinators feed off the flower's nectar.
This species is sometimes cultivated in gardens designed to attract butterflies, but is less common than the light purple Swamp milkweed (''Asclepias incarnata'') or the orange Butterfly weed (''Asclepias tuberosa''). The nectar of the plant attracts many other species of butterflies and insects as well.
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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