Eleocharis obtusa

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Monocots
Cladus: Commelinids
Ordo: Poales

Familia: Cyperaceae
Subfamilia: Cyperoideae
Tribus: Eleocharideae
Genus: Eleocharis
Species: Eleocharis obtusa
Name

Eleocharis obtusa (Willd.) Schult., Mant. 2: 89 (1824).
Synonyms

Basionym
Scirpus obtusus Willd., Enum. Pl.: 76 (1809).
Homotypic
Trichophyllum obtusum (Willd.) House, Amer. Midl. Naturalist 6: 205 (1920).
Heterotypic
Eleocharis obtusa var. gigantea Fernald, Proc. Amer. Acad. Arts 34: 493 (1899).
Eleocharis obtusa var. jejuna Fernald, Proc. Amer. Acad. Arts 34: 492 (1899).
Eleocharis obtusa var. ellipsoidalis Fernald ex Svenson, Rhodora 31: 216 (1929).
Eleocharis obtusa var. peasei Svenson, Rhodora 31: 217 (1929).

Distribution
Native distribution areas:

Continental: Northern America
Alabama; Arkansas; British Columbia; California; Colorado; Connecticut; Delaware; District of Columbia; Florida; Georgia; Idaho; Illinois; Indiana; Iowa; Kentucky; Louisiana; Maine; Maryland; Masachusettes; Michigan; Minnesota; Mississippi; Missouri; Nebraska; Nevada; New Hampshire; New Jersey; New Mexico; New York; North Carolina; Nova Scotia; Ohio; Oklahoma; Ontario; Oregon; Pennsylvania; Prince Edward I.; Qubec; Rhode I.; South Carolina; South Dakota; Tennessee; Texas; Vermont; Virginia; Washington; West Virginia; Wisconsin; Wyoming
Continental: Southern America
Regional: Southern South America
Argentina Northeast

References: Brummitt, R.K. 2001. TDWG – World Geographical Scheme for Recording Plant Distributions, 2nd Edition
References
Primary references

Schultes, J.A. 1824. Mantissa in Volumen Secundum. Systematis Vegetabilium Caroli a Linne ex Editione Joan. Jac. Roemer.... BHL Reference page. : 2: 89.

Links

Govaerts, R. et al. 2020. Eleocharis obtusa in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2020 Feb 16. Reference page.
International Plant Names Index. 2020. Eleocharis obtusa. Published online. Accessed: Feb 16 2020.
Govaerts, R. et al. 2020. Eleocharis obtusa in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2020 Feb 16. Reference page.
Tropicos.org 2020. Eleocharis obtusa. Missouri Botanical Garden. Published online. Accessed: 16 Feb 2020.
USDA, ARS, National Genetic Resources Program. Germplasm Resources Information Network - (GRIN) [Online Database]. [1]

Vernacular names
English: blunt spikerush, Blunt spikerush
français: Eléocharide obtuse

Eleocharis obtusa is a species of spikesedge known by the common name blunt spikerush. This plant is widely distributed across Canada and the United States, where it grows in wet areas such as riverbanks and moist forest floors. It is also a weed of rice paddies, especially when the rice plants are young sprouts. This is an annual spikesedge approaching half a meter in maximum height. It has many green cylindrical stems which are erect but weak and spongy. There may be thin, grasslike leaves toward the base of the plant, which are generally straw-colored. Atop each stem is a rounded or oblong spikelet containing at least ten flowers, each covered by an oval-shaped brown bract.