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stipa
''Stipa'' is a genus of around 300 large perennial hermaphroditic grasses collectively known as feather grass, needle grass, and spear grass. They are placed in the subfamily Pooideae and the tribe Stipeae.
Many species are important forage crops. Several species such as ''Stipa brachytricha'', ''S. arundinacea'', ''S. splendens'', ''S. calamagrostis'', ''S. gigantea'' and ''S. pulchra'' are used as ornamental plants. One species, esparto grass (''Stipa tenacissima''), is used for crafts and extensively in paper making.
==Ecology==
Species of the genus ''Stipa'' can occur in grasslands〔Elgaily Osman Ahmed, 1983〕 or in savanna habitats. Certain specific prairie plant associations are dominated by grasses of the genus ''Stipa'', which genus often lends its name to the terminology of some prairie types.〔Ecological Society of America, 1921〕 In some areas of the western USA grasses of the genus ''Stipa'' form a significant part of the understory of Blue Oak savannas, and were even a more important element prehistorically before the invasion of many European grasses.〔
*C. Michael Hogan, 2008〕
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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