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Juncus marginatus
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Monocots
Clade:	Commelinids
Order:	Poales
Family:	Juncaceae
Genus:	Juncus
Species:	J. marginatus
Binomial name
	Juncus marginatus; Rostk.
Synonyms
	List Juncus aristulatus Michx.; Juncus aristulatus var. pinetorum Coville; Juncus buchenaui Sved.; Juncus canaliculatus Liebm.; Juncus cylindricus M.A.Curtis; Juncus heteranthos Nutt.; Juncus marginatus var. aristulatus (Michx.) Coville; Juncus marginatus var. biflorus (Elliott) Engelm.; Juncus marginatus var. marginatus; Juncus marginatus var. odoratus Torr.; Juncus marginatus var. paucicapitatus Engelm.; Juncus marginatus var. setosus Coville; Juncus odoratus (Torr.) Steud.; Juncus setosus (Coville) Small ; Luzula angustifolia Poir.; Luzula juncoides Poir.; Tristemon laxum Raf.; ;

Juncus marginatus is a species of flowering plant, it is a type of rush with the common names of margined rush and grass-leaf rush.^[2]

Description

Juncus marginatus is a grass-like, herbaceous, short-lived perennial growing from short rhizomes.^[3] Plants produce dense tufts or clumps growing 30-130 cm tall.^[4] The plants are sometimes rhizomatous. The leaf blades are flat. The flowers are grouped together into a terminal inflorescence called a glomerulus.^[5] Each flower has three stamens and three sharply acute sepals that are reddish-brown in color. The plump and ribbed seeds are produced in a rounded and beakless capsule. The small yellow to light brown seeds are spindle-shaped, and around 0.5mm in length and lack a tail but have sharp points on either end (apiculate).^[3]^[4] The diploid chromosome count is 38.^[4]

Distribution and habitat

Juncus marginatus grows in North America in the Eastern and Southeastern US, ranging to Texas and South Dakota.^[5] It is also found Ontario Canada, California, Colorado, New Mexico, Oregon, New Mexico, the West Indies (Cuba), and Central America; where is found growing in moist to wet bogs, on shorelines, in marshes and ditches - with sandy, peaty, or clayey soils.^[4] One historic population existed in Minnesota until 1999 when other small populations were found in Anoka County; because of its rarity it was listed as an endangered specie in the state.^[3] In Minnesota the species is found growing in shallow wetlands/prairies of the Anoka Sand Plain where the normally dry sandy ground dips below the water table.^[3]