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Ptilagrostis
''Ptilagrostis'' is a genus of grasses in the family Poaceae. They are distributed in Asia and North America.〔(Flora of China Vol. 22 Page 204 细柄茅属 xi bing mao shu ''Ptilagrostis'' Grisebach in Ledebour, Fl. Ross. 4: 447. 1852. )〕 They are known commonly as false needlegrasses.〔(''Ptilagrostis''. ) Integrated Taxonomic Information System (ITIS).〕
Plants of this genus were originally separated from the genus ''Stipa'',〔Hamasha, H. R., et al. (2012). (''Stipa'' (Poaceae) and allies in the Old World: molecular phylogenetics realigns genus circumscription and gives evidence on the origin of American and Australian lineages. ) ''Plant Systematics and Evolution'' 298(2), 351-67.〕 and their relationship to that genus is still unclear. Some authorities still include them in ''Stipa'',〔(''Ptilagrostis''. ) Germplasm Resources Information Network (GRIN).〕 sometimes classifying ''Ptilagrostis'' as a section of that genus.〔 Some species are difficult to separate, being intermediate in form.〔
Most ''Ptilagrostis'' are variable plants. Many species have several forms and variants.〔 The genus is characterized in part by the papery, toothed lemmas of the spikelets, which have bent, plume-haired awns and do not overlap. This character separates the genus from ''Stipa'' and another close relative, the genus ''Achnatherum''.〔Peterson, P. M., et al. (2005). (''Ptilagrostis luquensis'' (Poaceae: Pooideae: Stipeae: Stipinae), a new species from China. ) ''Sida'' 21, 1355-62.〕 ''Ptilagrostis'' species are generally tufted perennial grasses with erect stems. The spikelets are borne in an open or somewhat open panicle. Each has one flower. The awn is twisted and bent once or twice.〔
;Species〔(Kew World Checklist of Selected Plant Families )〕〔〔〔〔(GRIN Species Records of ''Ptilagrostis''. ) Germplasm Resources Information Network (GRIN).〕
# ''Ptilagrostis alpina'' - Russia (Khabarovsk, Amur Oblast, Zabaykalsky Krai)
# ''Ptilagrostis concinna'' - Gansu, Qinghai, Shaanxi, Sichuan, Xinjiang, Tibet, Yunnan, Sikkim, Kyrgyzstan, Tajikistan, Jammu-Kashmir, Himachal Pradesh, Nepal, Bhutan, Arunachal Pradesh
# ''Ptilagrostis dichotoma'' - Gansu, Inner Mongolia, Qinghai, Shaanxi, Sichuan, Tibet, Yunnan, Bhutan, Sikkim, Nepal, India
# ''Ptilagrostis junatovii'' - Altai Krai, Zabaykalsky Krai, Tuva, Irkutsk Oblast, Kazakhstan, Tibet, Xinjiang, Mongolia
# ''Ptilagrostis kingii'' - Sierra Nevada in California
# ''Ptilagrostis luquensis'' - Gansu, Qinghai, Sichuan, Tibet
# ''Ptilagrostis malyschevii'' - Kyrgyzstan, Tajikistan, Kazakhstan
# ''Ptilagrostis milleri'' - Sikkim, Bhutan〔Nobis, M. and A. Nobis. (2013). (''Ptilagrostis milleri'' comb. nov. (Poaceae: Stipeae). ) ''Nordic Journal of Botany'' 31(5), 623–25.〕
# ''Ptilagrostis mongholica'' - Gansu, Hebei, Heilongjiang, Jilin, Liaoning, Inner Mongolia, Qinghai, Shaanxi, Shanxi, Sichuan, Xinjiang, Yunnan, Bhutan, Jammu-Kashmir, Mongolia, Nepal, Siberia
# ''Ptilagrostis pellioti'' - Gansu, Inner Mongolia, Ningxia, Qinghai, Xinjiang, Mongolia
# ''Ptilagrostis porteri'' - Rocky Mountains of Colorado + New Mexico
# ''Ptilagrostis schischkinii'' - Xinjiang
# ''Ptilagrostis yadongensis'' - Tibet
;formerly included〔
see ''Stipa''
*''Ptilagrostis tianschanica - Stipa tianschanica''
==References==
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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