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Grindelia microcephala : ウィキペディア英語版 | Grindelia microcephala
''Grindelia microcephala'', the littlehead gumweed, is a North American species of flowering plants in the daisy family. It is native to the south-central United States, having been found only in the State of Texas.〔(Biota of North America Program 2014 county distribution map )〕〔(Nesom, G.L. 1990. Studies in the systematics of Mexican and Texan ''Grindelia'' (Asteraceae: Astereae. Phytologia 68(4): 303–332 ) distribution map on page 307〕 ''Grindelia microcephala'' grows in rich bottom lands along streams. It is an annual herb up to tall. The plant usually produces numerous flower heads in open, flat-topped arrays. Each head has 16-27 ray flowers, surrounding a large number of tiny disc flowers.〔(Flora of North America ''Grindelia microcephala'' de Candolle 1836 )〕 ==References==
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