Burke: Eleocharis erythropoda vs. Eleocharis engelmannii

	Eleocharis erythropoda	Eleocharis engelmannii
	bald spike-rush, redfoot spike-rush	Engelman spikerush
Habit		Tufted annual, 0.5-5 dm. tall, the culms 0.5-2 mm. thick, with many ribs.
Leaves		Leaves all basal and reduced to sheaths.
Flowers		Spikelet terminal and solitary, 5-13 mm. long, ovoid, many-flowered, usually over 40; scales spirally arranged, 1.7-2.5 mm. long, purplish or brownish, with greenish mid-strip and paler, translucent margins, the lowest one sometimes empty; perianth bristles 6-7, brownish, about equal to the achene, or wanting; stamens 3; style usually bifid, thickened at the base.
Fruits		Achenes lenticular, 1.0-1.5 mm. long, including the flattened tubercle, which is appressed to the summit of the brown, smooth and shining body of the achene.

	Eleocharis erythropoda	Eleocharis engelmannii
Flowering time	June-September	June-September
Habitat	Tidal flats, shores, and limy fens.	Marshes and other wet places, from sea level to moderate elevations in the mountains.
Distribution	Occurring east of the Cascades crest in Washington; Alaska to Oregon, east from the Rocky Mountains to the Atlantic Coast. [WildflowerSearch map]	Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast. [WildflowerSearch map] [BONAP county map]
Origin	Native	Native
Conservation status	Not of concern	Not of concern
Sibling taxa	E. acicularis, E. bella, E. bolanderi, E. coloradoensis, E. engelmannii, E. geniculata, E. macrostachya, E. mamillata, E. obtusa, E. ovata, E. palustris, E. parvula, E. quinqueflora, E. rostellata, E. suksdorfiana, E. uniglumis	E. acicularis, E. bella, E. bolanderi, E. coloradoensis, E. erythropoda, E. geniculata, E. macrostachya, E. mamillata, E. obtusa, E. ovata, E. palustris, E. parvula, E. quinqueflora, E. rostellata, E. suksdorfiana, E. uniglumis
Web links	Local floras: BC, OR, WA Local Web sites: Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Eleocharis erythropoda

Eleocharis engelmannii

bald spike-rush, redfoot spike-rush

Engelman spikerush

Habit

Tufted annual, 0.5-5 dm. tall, the culms 0.5-2 mm. thick, with many ribs.

Leaves

Leaves all basal and reduced to sheaths.

Flowers

Spikelet terminal and solitary, 5-13 mm. long, ovoid, many-flowered, usually over 40;

scales spirally arranged, 1.7-2.5 mm. long, purplish or brownish, with greenish mid-strip and paler, translucent margins, the lowest one sometimes empty;

perianth bristles 6-7, brownish, about equal to the achene, or wanting;

stamens 3;

style usually bifid, thickened at the base.

Fruits

Achenes lenticular, 1.0-1.5 mm. long, including the flattened tubercle, which is appressed to the summit of the brown, smooth and shining body of the achene.