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Spurwort : ウィキペディア英語版
Sherardia

''Sherardia'' is a monotypic genus of flowering plants in the Rubiaceae family. The genus contains only one species, viz. ''Sherardia arvensis'' or (blue) field madder, which is widespread across most of Europe and northern Africa as well as southwest and central Asia (from Turkey to Saudi Arabia to Kazakhstan) and Macaronesia (Canary Islands, Azores, Madeira, Savage Islands).〔(【引用サイトリンク】title=''Sherardia'' in the World Checklist of Rubiaceae )〕 It is also reportedly naturalized in Australia, New Zealand, Taiwan, Kerguelen, Ethiopia, Sudan, southern Africa, Mexico, Costa Rica, South America, Bermuda, Cuba, Haiti and much of Canada and the United States (especially the Pacific States and the lower Mississippi Valley).〔(Kew World Checklist of Selected Plant Families, ''Sherardia arvensis'' )〕〔(Altervista Flora Italiana, ''Sherardia arvensis'' )〕〔(Biota of North America Program, ''Galium sherardia'' (synonym of ''Sherardia arvensis'') )〕
==Description==
''Sherardia arvensis'' is an annual plant with trailing and upright stems growing up to 40 cm long, having a square cross-section. The rough pointed bristly leaves of about 1 cm in length are in whorls of four to six (normally six at the ends of the shoots, but four nearer the root).
The tiny pale lilac or pink flowers are approximately 3 mm in diameter and have a long tube, with only the end part of the four petals free. The flowers grow in clusters of two or three together in an involucral structure formed out of a ring of six bracts.
The fruit are dry and about 3 mm long with two lobes giving rise to the two seeds (nutlets).
The four-angled stems with whorls of bristly leaves and tiny flowers are reminiscent of the Bedstraws and other related Rubiaceae, but ''Sherardia'' is distinguished by its mauve/pink flowers that are organized in clusters and having a long corolla tube.

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「Sherardia」の詳細全文を読む



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