Juncus marginatus

grassleaf rush
Family

Juncaceae

Leaf Arrangement

alternate, basal (rosulate)

Leaf Margin

entire

Leaf Type

simple

Leaf Shape

linear

Growth Form

graminoid

Flower Color

brown, green

Flower Month

April - September

Height (meters)

0.2 - 1.2

Milky Sap

No

Armed/Unarmed

Unarmed

Origin

native

Lifespan

perennial

Growing Season

Cool season


Wetland Class

FACW

Wetland Coefficient of Conservatism

5

Prairie Coefficient of Conservatism

3

Field Characters

Similar to J. dicotomus but has many flowers per subtending stalk and its capsules are reddish brown, while J. dicotomus has only one flower per stalk and its capsules are straw colored at maturity. It is sometime separated from Juncus biflorus by authors who consider J. marginatus to be smaller (to 3') and without rhizomes while J. biflorus grows to over 4' and is rhizomatous. No septa. Stem somewhat flattened, closely resembles a grass, leaves very shiny, without obvious veins. (Look-a-likes – grasses with flat stems at base – Echinochloas, Panicum rigidulum, Setaria glauca)

Cultural Information

The seeds of most species of Juncus may be planted fresh or after cold/moist stratification, and require light for germination (Steffen 1997).

Natural History

Found in moist soils throughout Louisiana and most of Texas, especially the eastern half. Ranges throughout the eastern half of North American.

Habitat

Moist, sandy, or peaty soil, stream and lake margins, wet prairies, ditches, at margin or in open woods.