UW Burke Herbarium species comparison

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Euphorbia glyptosperma

Euphorbia cyparissias

rib seed sandmat, corrugate seeded spurge, ridge seeded spurge

cypress spurge
Habit Monoecious, glabrous annuals with prostrate, freely-branching stems 0.5-4 dm. long. Glabrous perennial, the stems 1.5-3 dm. tall, simple below but freely branched above.
Leaves

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

stipules mostly linear, 1 mm. long.

Leaves alternate, the lower ones linear, 1-3 cm. long and 1-3 mm. broad;

leaves of the axillary upper branches more numerous and narrower.
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.

Inflorescence a many-rayed umbel, the floral bracts broadly ovate-cordate, 12-16 mm. long;

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

involucres about 3 mm. long, bearing 4 reddish-green, horned glands.
Fruits

Capsules smooth, 1.5 mm. long;

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

Capsules finely warty, separating into three 1-seeded segments.

Euphorbia glyptosperma

Euphorbia cyparissias
Flowering time June-September May-August
Habitat Dry, sandy soil, from the plains to the lower mountains. Roadsides, fields, ditches, wastelots, and other disturbed areas where often escaped from cultivation.
Distribution
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]
Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to California, east across much of North America to the Atlantic Coast.
[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. 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. 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
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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