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''Sium'' is a genus of flowering plants in the family Apiaceae. It is widely distributed across Europe, Asia, Africa, and North America.〔(''Sium''. ) Flora of China.〕 Plants of this genus are commonly called water parsnips.〔(''Sium''. ) Integrated Taxonomic Information System (ITIS).〕 These are perennial herbs, including some fully aquatic plants and some species that grow near water. The branching stem roots at the nodes. The lower leaves are pinnate, divided into leaflets. They are borne on petioles that sheath the stem at their bases. The inflorescence is a compound umbel of flowers with white petals.〔 There are about 12 species in the genus.〔Spalik, K., et al. (2009). (Generic delimitations within the ''Sium'' alliance (Apiaceae tribe Oenantheae) inferred from cpDNA rps16-5'trnk (UUU) and nrDNA ITS sequences. ) ''Taxon'' 58(3), 735-48.〕〔Spalik, K. and S. R. Downie. (2006). (The evolutionary history of ''Sium'' sensu lato (Apiaceae): dispersal, vicariance, and domestication as inferred from ITS rDNA phylogeny. ) ''American Journal of Botany'' 93(5), 747-61.〕 Species include:〔 *''Sium bracteatum'' jellico, large jellico〔Cairns-Wicks, R. 2003. (''Sium bracteatum''. ) In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.1. Downloaded on 22 August 2013.〕 *''Sium burchellii'' – dwarf jellico〔Cairns-Wicks, R. 2003. (''Sium burchellii''. ) In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.1. Downloaded on 22 August 2013.〕 * ''Sium frigidum'' *''Sium latifolium'' – wideleaf water parsnip, great water parsnip *''Sium medium'' *''Sium ninsi'' *''Sium repandum'' *''Sium serra'' *''Sium sisaroideum'' *''Sium sisarum'' – skirret *''Sium suave'' – common water parsnip, hemlock water parsnip *''Sium tenue'' ==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「Sium」の詳細全文を読む スポンサード リンク
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