UW Burke Herbarium species comparison

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Euphorbia thymifolia

Euphorbia virgata

wolf's milk, leafy spurge
Habit Perennial from sturdy rhizomes, the stems 2-9 dm. tall, erect, simple below but freely and umbellately branched above, glaucous and usually glabrous.
Leaves

The main cauline leaves alternate, oblong to linear-oblanceolate, entire, 2-6 cm. long and 2-8 mm. broad, sessile; lower leaves scale-like; floral leaves very broadly cordate-ovate, 12-16 mm. long.
Flowers

Inflorescence of terminal cymes on the branches;

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 2-3 mm. long, bearing 4 brownish-green glands with short, divergent horns.
Fruit

Capsule nearly smooth, separating into three 1-seeded segments.

Euphorbia thymifolia

Euphorbia virgata
Flowering time May-June
Habitat Noxious weed of disturbed soils
Distribution
[BONAP county map]
Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
[BONAP county map]
Origin Introduced from Eurasia
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. glyptosperma, E. helioscopia, E. lathyris, E. maculata, E. myrsinites, E. oblongata, E. peplus, E. platyphyllos, E. segetalis, E. serpillifolia, E. serrulata, E. spathulata
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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