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''Tragopogon porrifolius'' is a plant cultivated for its ornamental flower, edible root, and herbal properties. It also grows wild in many places and is one of the most widely known species of the salsify genus, ''Tragopogon''. It is commonly known as purple or common salsify, oyster plant, vegetable oyster, Jerusalem star, goatsbeard or simply salsify (although these last two names are also applied to other species, as well). ==Description== ''T. porrifolius'' is a common biennial wildflower, native to Mediterranean regions of Europe but introduced elsewhere, for example, into the British Isles (mainly in central and southern England),〔 p. 707.〕 other parts of northern Europe, North America, and southern Africa and in Australia; in the United States it is now found growing wild in almost every state, including Hawaii, except in the extreme south-east. The plant grows to around 120 cm in height. As with other ''Tragopogon'' species, its stem is largely unbranched, and the leaves are somewhat grasslike. It exudes a milky juice from the stems. In the UK it flowers from June to September, but in warmer areas such as California it can be found in bloom from April. The flower head is about 5 cm across, and each is surrounded by green bracts which are longer than the petals (technically, the ligules of the ray flowers). The flowers are like that of Goatsbeard ''Tragopogon pratensis'', but are larger and dull purple, 30-50mm across. The flowers are hermaphroditic, and pollination is by insects. The fruits are of the clock variety. 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「Tragopogon porrifolius」の詳細全文を読む スポンサード リンク
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