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Helianthus exilis : ウィキペディア英語版 | Helianthus exilis
''Helianthus exilis'' is a species of sunflower〔(The Plant List, ''Helianthus exilis'' A.Gray )〕 known by the common name serpentine sunflower. It is native to northern California (from Siskiyou County south to Napa County and Nevada County), where it grows mainly in mountainous areas, often in serpentine soils.〔(Calflora taxon report, University of California, ''Helianthus exilis'' Gray serpentine sunflower )〕 ''Helianthus exilis'' is an erect annual reaching heights over a meter (40 inches)). It has a hairy, rough stem with leaves lance- or oval-shaped, usually pointed, sometimes serrated along the edges, and 3 to 15 centimeters (1.2-6.0 inches) long. The inflorescence holds one or more flower heads, and each plant may have many inflorescences growing along the full length of the stem. The flower head has a cup of long, pointed phyllaries holding an array of bright yellow ray florets each one to two centimeters (0.4-0.8 inches) long around a center of yellow to dark purple or reddish disc florets. The achene is 3 to 5 millimeters (0.12-0.20 inches) long.〔(Flora of North America, ''Helianthus exilis'' A. Gray, 1865. Serpentine sunflower )〕 ==References==
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「Helianthus exilis」の詳細全文を読む
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