UW Burke Herbarium species comparison

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Euphorbia hypericifolia

Euphorbia cyparissias

cypress spurge
Habit Glabrous perennial, the stems 1.5-3 dm. tall, simple below but freely branched above.
Leaves

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

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 finely warty, separating into three 1-seeded segments.

Euphorbia hypericifolia

Euphorbia cyparissias
Flowering time May-August
Habitat Roadsides, fields, ditches, wastelots, and other disturbed areas where often escaped from cultivation.
Distribution
[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 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. 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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