''Sium'' is a genus of

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (). The term angiosperm is derived from the Ancient Greek, Greek words (; 'container, vessel') and (; 'seed'), meaning that the seeds are enclosed with ...

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 p ...

. 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, also referred to as hydrophytes, are vascular plants and Non-vascular plant, non-vascular plants that have adapted to live in aquatic ecosystem, aquatic environments (marine ecosystem, saltwater or freshwater ecosystem, freshwater ...

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 In botany, an inflorescence is a group or cluster of flowers arranged on a plant's Plant stem, stem that is composed of a main branch or a system of branches. An inflorescence is categorized on the basis of the arrangement of flowers on a mai ...

is a compound

umbel UMBEL (Upper Mapping and Binding Exchange Layer) is a logically organized knowledge graph of 34,000 concepts and entity types that can be used in information science for relating information from disparate sources to one another. It was retired ...

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 *'' Sium burchellii'' – dwarf jellico * '' Sium frigidum'' *'' Sium latifolium'' – wideleaf water parsnip, great water parsnip *''

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

'' *'' Sium ninsi'' *'' Sium repandum'' *'' Sium serra'' *''

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'' – skirret *''

Sium suave ''Sium suave'', the water parsnip or hemlock waterparsnip, is a Perennial plant, 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 par ...

'' – 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