UW Burke Herbarium species comparison

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Euphorbia spathulata

Euphorbia helioscopia

reticulate seeded spurge, spatulate leaved spurge, warty spurge

mad woman's milk, summer spurge, sun spurge, wart spurge, wartweed
Habit Somewhat fleshy annual, the upright stem 2-5 dm. tall, simple or occasionally branched below, umbellately branched near the top, nearly glabrous below but with dense, soft hairs above.
Leaves

Lower cauline leaves alternate, oblanceolate, narrowed to the base, 1-3 cm. long, finely serrate-dentate; floral leaves opposite or whorled, finely toothed.
Flowers

Flowers naked in obconic involucres, these bearing 4 greenish-yellow glands alternate with horn-less lobes; staminate flowers numerous, included in the involucre, represented by a single stamen; pistillate flower single, protruded from the involucre.
Fruits

Capsule 3-celled, smooth.

Euphorbia spathulata

Euphorbia helioscopia
Flowering time May-July April-July
Habitat Moist open areas, prairies, and woodlands. Weed of cultivated areas and abondoned gardens.
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 west of the Cascades crest in Washington; British Columbia to California, east to the northern Rocky Mountains and northern Great Plains, Texas, and eastern North America.
[WildflowerSearch map]
[BONAP county map]
Origin Native Introduced from Eurasia
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. lathyris, E. maculata, E. myrsinites, E. oblongata, E. peplus, E. platyphyllos, E. segetalis, E. serpillifolia, E. serrulata, E. spathulata, E. virgata
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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