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''Hieracium horridum'', known as the prickly hawkweed〔 or shaggy hawkweed, gets its name from the long, dense, shaggy white to brown hairs (trichomes) which cover all of the plant parts〔 〕 of this plant species.〔 〕 The species is native to Oregon, California, and Nevada in the western United States.〔(Calflora taxon report, University of California, ''Hieracium horridum'' Fries Shaggy Hawkweed, prickly hawkweed )〕〔(Biota of North America Program 2014 county distribution map )〕 ''Hieracium horridum'' possesses oblong leaves along the stems of this to tall hairy plant with 11-12 bright yellow flower heads at the top〔 of each flower head, which is to in diameter. It flowers between late June and August. Like all members of the Asteraceae family, the flowers are actually florets made up of many ray corolla, each ray its own stamen. As with other plants of the tribe Cichorieae, the stems and leaves produce a milky substance when broken.〔 〕 ==Distribution== ''Hieracium horridums habitat is in dry rocky places within mountainous coniferous forests〔 in Oregon, California and Nevada〔〔 at elevations between and .〔 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「Hieracium horridum」の詳細全文を読む スポンサード リンク
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