UW Burke Herbarium species comparison

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Euphorbia spathulata

Euphorbia serpillifolia

reticulate seeded spurge, spatulate leaved spurge, warty spurge

thyme leaved spurge
Habit Monoecious, glabrous annuals with freely-branched, prostrate stems 0.5-3 dm. long.
Leaves

: Leaves opposite, 5-15 mm. long, obliquely oblanceolate to oblong-ovate, serrulate near the tips;

stipules lanceolate, 0.5-1.5 mm. long, usually lacerate.
Flowers

Flowers tiny, monoecious, borne in axillary involucres; staminate flowers numerous, naked, each consisting of a single stamen; pistillate flower single and terminal in the involucre;

involucre bearing 4 glands with sunken centers, separated by lobed, whitish appendages.
Fruits

Capsules smooth, 1.5-2 mm. long;

seeds 1.2 mm. long, grayish-brown, prismatic.

Euphorbia spathulata

Euphorbia serpillifolia
Flowering time May-July May-September
Habitat Moist open areas, prairies, and woodlands. Dry ground from the plains to the lower mountains.
Distribution
Occurring east of the Cascades crest in Washington; eastern Washington to California, east across North America to the Atlantic Coast.
[WildflowerSearch map]
[BONAP county map]
Occurring chiefly east of the Cascades crest in Washington; British Columbia to Baja California, east to the Great Plains, Great Lakes region, and eastern North America.
Origin Native Native
Conservation status Not of concern Not of concern
Sibling taxa
E. agraria, E. amygdaloides, E. characias, E. cyparissias, E. epithymoides, E. glyptosperma, E. helioscopia, E. lathyris, E. maculata, E. myrsinites, E. oblongata, E. peplus, E. platyphyllos, E. segetalis, E. serpillifolia, E. serrulata, E. virgata
E. agraria, E. amygdaloides, E. characias, E. cyparissias, E. epithymoides, E. glyptosperma, E. helioscopia, E. lathyris, E. maculata, E. myrsinites, E. oblongata, E. peplus, E. platyphyllos, E. segetalis, E. serrulata, E. spathulata, E. virgata
Subordinate taxa
E. serpillifolia ssp. hirtula, E. serpillifolia ssp. serpillifolia
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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