|
''Machaeranthera'' is a genus of North American flowering plants in the daisy family which are known by the common name tansyaster.〔Nees von Esenbeck, Christian Gottfried Daniel. 1832. Genera et Species Asterearum 13, 224–225〕〔(Flora of North America Vol. 20 Page 394 ''Machaeranthera'' Nees, Gen. Sp. Aster. 13, 224. 1832. )〕 Tansyasters are variable in appearance. Some are small singular wildflowers while others are sprawling shrubs. Several species easily hybridize with each other as well, making identification difficult. In general, members of the genus may be identified by the sharp-pointed, dagger-shaped anthers in the disc florets at the center of the flower. The flower heads are usually daisylike and are usually a shade of purple or blue, but may be pink, yellow, or white. Tansyasters are native to western North America.〔 The genus ''Machaeranthera'' is distinguished from the genus ''Dieteria'' by having once or twice pinnate leaves, whereas ''Dieteria'' has entire to toothed leaves.〔Mojave Desert Wildflowers, Pam MacKay, 2nd Ed. 2013, p. 39〕 "Machaeranthera" means "swordlike anthers".〔Great Basin Wildflowers, Laird R. Blackwell, 2006, p. 26〕 ;Species〔〔(Biota of North America Program 2013 county distribution maps )〕 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Machaeranthera」の詳細全文を読む スポンサード リンク
|