Carex viridula

Carex viridula
Carex viridula var. viridula
Conservation status
Secure  (NatureServe)[1]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Monocots
Clade:	Commelinids
Order:	Poales
Family:	Cyperaceae
Genus:	Carex
Section:	Carex sect. Ceratocystis
Species:	C. viridula
Binomial name
Carex viridula Michx.

Carex viridula, known as little green sedge, green sedge, or greenish sedge, is a small flowering plant native to North America, Europe, Asia, and Morocco.^[2]

Taxonomy

Carex viridula is in the section Carex sect. Ceratocystis, a circumboreal group with around six other species, although the taxonomy of this group is controversial, and up to 19 species have been recognized.^[3][4]

Flora of North America accepts the following three subspecies and two varieties of Carex viridula:^[2][5]

• Carex viridula subsp. brachyrrhyncha
  • Carex viridula var. elatior
  • Carex viridula var. saxilittoralis
• Carex viridula subsp. oedocarpa
• Carex viridula subsp. viridula

As of December 2019^[update], Kew's Plants of the World Online lists Carex viridula as a synonym of Carex oederi.^[6]

There is also variety Carex viridula var. bergrothii (Palmgr.) B.Schmid (synonym Carex bergrothii Palmgr.).^[7]

Conservation status

It is listed as endangered in Connecticut^[8] and Pennsylvania.^[9] It is listed as threatened in Illinois.^[9]

References

1. NatureServe (3 December 2022). "Carex viridula Little Green Sedge". NatureServe Explorer (explorer.natureserve.org). NatureServe. Retrieved 29 December 2022.
2. Crins, William J. (2002). "Carex viridula". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). Vol. 23. New York and Oxford: Oxford University Press. Retrieved 20 December 2019 – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
3. Crins, William J. (2002). "Carex sect. Ceratocystis". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). Vol. 23. New York and Oxford: Oxford University Press. Retrieved 20 December 2019 – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
4. Jiménez-Mejías, Pedro; Luceño, Modesto; Martín-Bravo, Santiago (1 May 2014). "Species boundaries within the southwest Old World populations of the Carex flava group (Cyperaceae)". Systematic Botany. 39 (1): 117–131. doi:10.1600/036364414X677973. JSTOR 24546124. S2CID 85265989 – via ResearchGate.
5. • i. Crins, William J.; Ball, Peter W. (January 1988). "Sectional limits and phylogenetic considerations in Carex section Ceratocystis (Cyperaceae)". Brittonia. 40 (1): 38–47. doi:10.2307/2806873. JSTOR 2806873. S2CID 39085479 – via ResearchGate.
   • ii. Crins, William J.; Ball, Peter W. (April 1989). "Taxonomy of the Carex flava complex (Cyperaceae) in North America and northern Eurasia. II. Taxonomic treatment". Canadian Journal of Botany. 67 (4): 1048–1065. doi:10.1139/b89-138 – via ResearchGate.
6. "Carex viridula". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 20 December 2019.
7. "Carex bergrothii Palmgr". www.worldfloraonline.org. Retrieved 6 February 2021.
8. "Connecticut's Endangered, Threatened and Special Concern Species 2015" (PDF). State of Connecticut Department of Energy and Environmental Protection Bureau of Natural Resources. Retrieved 19 December 2019.
9. NRCS (2014). "Carex viridula". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 19 December 2019.