Host an Event Volunteer Join Tickets

Support the plant database you love!


Plant Database

Search for native plants by scientific name, common name or family. If you are not sure what you are looking for, try the Combination Search or our Recommended Species lists.

Enter a Plant Name:
Or you can choose a plant family:

Juncus dubius

Juncus dubius Engelm.

Dubius Rush, Mariposa Rush, Little Bamboo

Juncaceae (Rush Family)


USDA Symbol: judu

USDA Native Status: L48 (N)

Creeping rootstocks send up rather close, single, erect, stout stems 1 1/2-3 ft. tall. Grass-like leaves are dark green. The seed head is widely branched with light greenish-brown spikelets.

A member of the family Juncaceae which includes herbs, rarely shrubs, with mostly grass-like leaves, usually in a basal tuft, and small greenish or brownish flower in dense spikes or heads or sometimes in loose clusters or even solitary.


From the Image Gallery

No images of this plant

Plant Characteristics

Duration: Perennial
Habit: Grass/Grass-like
Fruit Type: Capsule
Size Notes: Up to about 3 feet tall.

Bloom Information

Bloom Color: Yellow , Brown
Bloom Time: May , Jun , Jul , Aug , Sep , Oct


Native Distribution: Through CA Coast Ranges to OR
Native Habitat: Wet places

Growing Conditions

Light Requirement: Sun
Soil Moisture: Wet
Soil Description: Wet soils.


Commercially Avail: yes

National Wetland Indicator Status

This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1 (Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here for map of regions.

Web Reference

Webref 30 - Calflora (2018) Calflora
Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

USDA: Find Juncus dubius in USDA Plants
FNA: Find Juncus dubius in the Flora of North America (if available)
Google: Search Google for Juncus dubius


Record Modified: 2023-01-10
Research By: TWC Staff

Go back