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''Deinandra conjugens'' (syn. ''Hemizonia conjugens'') is a rare species of flowering plant in the aster family known by the common names Otay tarplant and Otay tarweed. It is native to a small section of far northern Baja California in Mexico, its range extending north into San Diego County, California, in the United States. One isolated population has been reported from the hills east of Cayucos in San Luis Obispo County.〔(Calflora taxon report, University of California, ''Deinandra conjugens'' (Keck) B.G. Baldwin, Otay tarplant )〕 ''Deinandra conjugens'' is threatened by habitat destruction and degradation.〔USFWS. (''Deinandra conjugens'' Five-year Review. ) June 2009.〕 It was federally listed as a threatened species in 1998.〔(''Deinandra conjugens''. ) The Nature Conservancy.〕 ==Description== ''Deinandra conjugens'' is an annual herb growing up to about in height with a solid, bristly, gland-dotted stem. The lower leaves are hairy and lobed or toothed, and measure up to about 4.5 centimeters long.〔 The inflorescence is made up of one or more flower heads, sometimes with many heads in clusters. The underside of the head is covered in phyllaries with many glands. Each head has 7 to 10 yellow ray florets no more than 6 millimeters long. Most ray florets have three tiny lobes at the tips. The center of the head is filled with yellow disc florets tipped with black, dark purple or red anthers. The flowers are most often pollinated by bees.〔〔 The fruit is an achene. The achenes arising from the disc florets have pappi of white scales.〔(''Deinandra conjugens''. ) Flora of North America.〕〔(''Hemizonia conjugens''. ) Jepson Manual.〕 Disc achenes germinate sooner than those from ray florets. Many achenes drop into the soil seed bank.〔 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「Deinandra conjugens」の詳細全文を読む スポンサード リンク
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