UW Burke Herbarium species comparison

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Eleocharis uniglumis

Eleocharis parvula

slender spike-rush

little-head spikerush
Habit Diminutive, very slender perennial from slender rhizomes, forming dense mats; culms filiform, 2-6 cm. tall.
Leaves

Leaves all basal and reduced to sheaths.
Flowers

Spikelet terminal and solitary, 2-4.5 mm. long with 2-9 flowers;

scales of the spikelets spirally arranged, 1.5-2 mm. long, the lowest one empty;

perianth of 3-6 bristles, or none;

stamens 3;

style trifid, thickened at the base.
Fruits

Achenes straw-colored, triangular 0.9-1.3 mm. long including the inconspicuous tubercle, which is confluent with the body of the achene.

Eleocharis uniglumis

Eleocharis parvula
Flowering time June-August June-September
Habitat Shores, dunes, alkaline marshes, and peatlands. Wet, saline or alkaline soils.
Distribution
Occurring east of the Cascades crest in Washington, where known only from a historic collection (1935); British Columbia to Washington, also Nevada, scattered east across North America to the Atlantic Coast; circumboreal.
[WildflowerSearch map]
Occurring on both sides of the Cascades crest in Washington; British Columbia to California, and from Kansas east and north to the Atlantic Coast.
[WildflowerSearch map]
[BONAP county map]
Origin Native Native
Conservation status Review Group 1 in Washington (WANHP) Not of concern
Sibling taxa
E. acicularis, E. bella, E. bolanderi, E. coloradoensis, E. engelmannii, E. erythropoda, E. geniculata, E. macrostachya, E. mamillata, E. obtusa, E. ovata, E. palustris, E. parvula, E. quinqueflora, E. rostellata, E. suksdorfiana
E. acicularis, E. bella, E. bolanderi, E. coloradoensis, E. engelmannii, E. erythropoda, E. geniculata, E. macrostachya, E. mamillata, E. obtusa, E. ovata, E. palustris, E. quinqueflora, E. rostellata, E. suksdorfiana, E. uniglumis
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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