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''Agnorhiza reticulata'' (syn. ''Wyethia reticulata''), known by the common name El Dorado County mule's ears, is a rare species of flowering plant found only in a small region of north-central California.〔 ''Agnorhiza reticulata'' grows in the California interior chaparral and woodlands habitats of the Sierra Nevada foothills.〔(The Nature Conservancy )〕 It has been found in El Dorado, Sacramento, and Yuba Counties.〔(Biota of North America Program, 2014 county distribution map, ''Agnorhiza reticulata'' )〕〔(Calflora taxon report, University of California @ Berkeley, ''Wyethia reticulata'' E. Greene El Dorado County mule ears, El Dorado mule ears, Eldorado wyethia )〕 The genetic diversity of the populations is probably low because they are often clonal, spreading via vegetative reproduction with rhizomes rather than sexual reproduction by seed.〔 Some populations are also threatened by development of their habitat.〔〔Ayres, D. R. and F. J. Ryan. (1999). (Genetic diversity and structure of the narrow endemic ''Wyethia reticulata'' and its congener ''W. bolanderi'' (Asteraceae) using RAPD and allozyme techniques. ) American Journal of Botany 86 344-53.〕 ==Description== ''Agnorhiza reticulata'' is a perennial herb producing a hairy, glandular, sticky-textured stem growing 40 to 70 centimeters tall, at times reaching 1 meter (3 ft.). The leaves have triangular or lance-shaped blades up to 15 centimeters long.〔(Flora of North America, ''Agnorhiza reticulata'' )〕 The inflorescence is a usually solitary sunflowerlike flower head with up to 21 yellow ray florets measuring up to 2.5 centimeters long. At the center are yellow disc florets. The flowers are pollinated by native bees.〔〔(Jepson Manual Treatment of ''Agnorhiza reticulata'' )〕 The fruit is an achene a few millimeters long which usually lacks a pappus. 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「Agnorhiza reticulata」の詳細全文を読む スポンサード リンク
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