''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. 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 plant Aquatic plants are plants that have adapted to living in aquatic environments (saltwater or freshwater). They are also referred to as hydrophytes or macrophytes to distinguish them from algae and other microphytes. A macrophyte is a plant that ...

s 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 stem that is composed of a main branch or a complicated arrangement of branches. Morphologically, it is the modified part of the shoot of seed plants where flowers are formed o ...

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 ''Sium bracteatum'' (known commonly as jellico and large jellico) is a species of flowering plant in the family Apiaceae. It is endemic to Saint Helena. It is protected in Diana's Peak National Park, but proper management practices have not yet ...

'' jellico, large jellico *''

Sium burchellii ''Sium burchellii'', known commonly as dwarf jellico, is a species of flowering plant in the family Apiaceae. It is endemic to Saint Helena. It grows on steep island cliffs. It is threatened by the fragmentation of its small populations, introduc ...

'' – dwarf jellico * '' Sium frigidum'' *''

Sium latifolium ''Sium latifolium'' is a species of flowering plant in the family Apiaceae known by the common names great water-parsnip, greater water-parsnip, and wideleaf waterparsnip. It is native to much of Europe, Kazakhstan, and Siberia. This plant grows ...

'' – wideleaf water parsnip, great water parsnip *'' Sium medium'' *'' Sium ninsi'' *'' Sium repandum'' *''

Sium serra ''Sium'' is a genus of flowering plants in the family Apiaceae. It is widely distributed across Europe, Asia, Africa, and North America.

'' *''

Sium sisaroideum ''Sium'' is a genus of flowering plants in the family Apiaceae. It is widely distributed across Europe, Asia, Africa, and North America.

'' *''

Sium sisarum ''Sium sisarum'', commonly known as skirret, is a perennial plant of the family Apiaceae sometimes grown as a root vegetable. The English name skirret is derived from the Middle English 'skirwhit' or 'skirwort', meaning 'white root'. In Scotlan ...

'' – skirret *''

Sium suave ''Sium suave'', the water parsnip or hemlock waterparsnip, is a perennial wildflower in the family Apiaceae. It is native to many areas of both Asia and North America. The common name water parsnip is due to its similarity to parsnip (''Pastinaca ...

'' – common water parsnip, hemlock water parsnip *''

Sium tenue ''Sium'' is a genus of flowering plants in the family Apiaceae. It is widely distributed across Europe, Asia, Africa, and North America.

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