Vascular Plants - Juncaceae - Juncus:
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Juncus uncialis
Page Author: Don Knoke
twelfth rush, inch-high rush 
Image © Florence Caplow
Blooms: May - June
Habit: herb
Duration: annual
Origin: Native
Conservation Status: Under Review

Distribution: Oregon and California, occasional in estern Washington
Habitat: Margins of vernal pools and ponds.
Species Description:

General: Tufted annual, the numerous stems 0.8-3.5 cm. tall and over 0.2 mm. in diameter.
Leaves: Leaves to 2.2 cm. long, ½ to ¾ the height of the plant; leaf bases sheathing.
Flowers: Inflorescence terminal, with solitary flowers; tiny, membranous bract subtending the flower; perianth 0.6-0.9 mm. long, the 6 segments subequal, erect, greenish or tinged with red; stamens usually 3, the anthers 1/3 the length of the filaments.
Fruits: Capsule ovoid to ellipsoid, reddish to maroon, slightly shorter than the tepals.
Accepted Name:
Juncus uncialis Greene
Synonyms:
(none)

Treated in Flora of the PNW as:
?
Additional Resources:

PNW Herbaria Specimens: View list of Juncus uncialis specimens in the Consortium of Pacific Northwest Herbaria database.

WTU Herbarium Specimens: View list of Juncus uncialis specimens in the WTU Herbarium database.

Washington Flora Checklist: Juncus uncialis treatment.

E-Flora BC: Juncus uncialis atlas page.

CalPhotos: Juncus uncialis images.

USDA Plants Database: Juncus uncialis.
Additional photographs of Juncus uncialis:
(click on a thumbnail to view larger photo)

Florence Caplow
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Burke Museum


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Washington Native Plant Society
WA Native Plant Society