Eleocharis geniculata

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 geniculata
Name

Eleocharis geniculata (L.) Roem. & Schult.
References

Syst. veg. 2:150. 1817
USDA, ARS, Germplasm Resources Information Network. Eleocharis geniculata in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 08-Apr-12.ac

Eleocharis geniculata is a species of spikesedge known by several common names, including bent spikerush and Canada spikesedge. This is a widespread plant of wet areas in the Americas, Asia, Africa, Australia, Madagascar, and some Pacific Islands.[1][2][3] It is an annual spikesedge growing to a maximum height of about 40 centimeters. It has a few straw-colored leaves and many thin erect stems. The stems hold inflorescences of rounded spikelets each containing at least 10 tiny flowers. The flowers are covered with dark greenish-brown bracts. The fruit is a shiny purple-brown achene not more than a millimeter long.[4]
References

Kew World Checklist of Selected Plant Families
Flora of China, Vol. 23 Page 196, 黑籽荸荠 hei zi bi qi, Eleocharis geniculata (Linnaeus) Roemer & Schultes, Syst. Veg. 2: 150. 1817.
Biota of North America Program 2013 county distribution map
Flora of North America, Eleocharis geniculata (Linnaeus) Roemer & Schultes in J. J. Roemer et al., Syst. Veg. 2: 150. 1817.