UW Burke Herbarium species comparison

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Euphorbia oblongata

Euphorbia serpillifolia

balkan spurge, egg-leaf 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 oblongata

Euphorbia serpillifolia
Flowering time May-July May-September
Habitat Roadsides, fields, ditches, wastelots, and other disturbed, open areas. Dry ground from the plains to the lower mountains.
Distribution
Occurring west of the Cascades crest in lowland western Washington; southwestern British Columbia to California.
[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 Introduced from Europe 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. peplus, E. platyphyllos, E. segetalis, E. serpillifolia, E. serrulata, E. spathulata, 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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