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Hemizonella
''Hemizonella '' is a genus of North American plants in the tarweed tribe within the sunflower family.〔(Gray, Asa. 1874. Proceedings of the American Academy of Arts and Sciences 9: 189 )〕〔(Flora of North America Vol. 21 Page 296, ''Hemizonella'' (A. Gray) A. Gray )〕
The only known species is ''Hemizonella minima'' (opposite-leaved tarweed), native to British Columbia, Washington, Oregon, California, Montana, Idaho, Nevada〔(Flann, C (ed) 2009+ Global Compositae Checklist )〕〔Hemizonella bonap〕
The plant grows in many types of forest, scrub, and chaparral habitats, from mountains to deserts. It is found in the Sierra Nevada and Cascade Range, and Mojave Desert.〔
''Hemizonella minima'' is a small annual herb producing a thin, fuzzy stem up to about in maximum height. The pointed, hairy leaves are no more than long. The inflorescence produces one or more tiny flower heads which are oblong or shaped like tops on close inspection. Each is a few millimeters wide, enclosed in phyllaries studded with stalked resin glands, and tipped with minute yellowish florets. The fruit is an achene a few millimeters long with no pappus.〔
== 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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