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Holocarpha obconica : ウィキペディア英語版 | Holocarpha obconica
''Holocarpha obconica'', commonly known as the San Joaquin tarweed, is a North American plant species in the sunflower family. It is endemic to (found only in) California, primarily in the Central Valley and adjacent regions. 〔(CalFlora taxon report, University of California, ''Holocarpha obconica'' (J. Clausen & Keck) Keck, San Joaquin tarweed ) . accessed 11.14.2011.〕 The epithet ''"obconica"'' means "obconical," in other words, shaped like a cone but with the widest part farthest from the base. Achenes of ''H. obconica'' are obconical. The plant is a resin-containing herb up to 120 cm (4 feet) tall. It peroduces numerous flower heads, each head containing 4–9 yellow ray flowers surrounding 11–21 small yellow disc flowers, the disc flowers having yellow or brown anthers.〔(Flora of North America, ''Holocarpha obconica'' (J. C. Clausen & D. D. Keck) D. D. Keck, 1958. )〕〔Clausen, Jens Christian & Keck, David Daniels. 1935. Madroño 3(1): 7, ''Hemizonia obconica'' 〕 ==References==
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