''Sium'' is a genus of

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly called angiosperms. The term "angiosperm" is derived from the Greek words ('container, vessel') and ('seed'), and refers to those plants th ...

s in the family

Apiaceae Apiaceae or Umbelliferae is a family of mostly aromatic flowering plants named after the type genus '' Apium'' and commonly known as the celery, carrot or parsley family, or simply as umbellifers. It is the 16th-largest family of flowering plan ...

. 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 An inflorescence is a group or cluster of flowers arranged on a Plant stem, stem that is composed of a main branch or a complicated arrangement of branches. Morphology (biology), Morphologically, it is the modified part of the shoot of sperma ...

is a compound

umbel In botany, an umbel is an inflorescence that consists of a number of short flower stalks (called pedicels) that spread from a common point, somewhat like umbrella ribs. The word was coined in botanical usage in the 1590s, from Latin ''umbella'' "p ...

of flowers with white petals. siummete 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 *'' Sium burchellii'' – dwarf jellico * '' 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

External links

GRIN Species Records of ''Sium''.
Germplasm Resources Information Network (GRIN).
''Sium''.
The Jepson eFlora 2013. Apioideae genera Taxonomy articles created by Polbot {{Apiaceae-stub