UW Burke Herbarium species comparison

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Euphorbia polycarpa

Euphorbia glyptosperma

rib seed sandmat, corrugate seeded spurge, ridge seeded spurge
Habit Monoecious, glabrous annuals with prostrate, freely-branching stems 0.5-4 dm. long.
Leaves

Leaves opposite, obliquely lanceolate to oblong, 5-15 mm. long, entire or with fine, rounded serrations;

stipules mostly linear, 1 mm. long.
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 pinkish glands with whitish appendages, a fifth gland represented by a short, fringed lobe.
Fruits

Capsules smooth, 1.5 mm. long;

seeds 1.2 mm. long, grayish, prismatic, coarsely wrinkled.

Euphorbia polycarpa

Euphorbia glyptosperma
Flowering time June-September
Habitat Dry, sandy soil, from the plains to the lower mountains.
Distribution
[WildflowerSearch map]
[BONAP county map]
Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to across most of North America to the Atlantic Coast.
[WildflowerSearch map]
[BONAP county map]
Origin Native
Conservation status 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. spathulata, E. virgata
E. agraria, E. amygdaloides, E. characias, E. cyparissias, E. epithymoides, E. helioscopia, 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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