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prairie spurge

cypress spurge

Habit Herbs annual, 1–5(6) dm; stems, erect, glabrous. Herbs or subshrubs perennial, 1.5–3(4) dm; stems erect, glabrous.
Leaves

alternate (upper leaves may be opposite), obovate to spatulate, 10–30 × 5–15 mm;

margins toothed at least in upper 25%; entire below;

tips rounded;

surfaces glabrous, sessile.

lower leaves alternate, sometimes appearing whorled, linear, 10–30 × 1–3 mm;

margins entire;

tips obtuse to acuminate;

surfaces glabrous, sessile; floral leaves opposite or whorled, broadly ovate, 0.4–1 cm;

margins entire to slightly crenate, sessile.

Inflorescences

involucres cone- to bell-shaped, 2–3 mm;

glands not horned.

involucres bell-shaped, 1–3 mm;

glands 2-horned.

Flowers

styles divided nearly to base.

Fruits

round, 2–2.5 mm.

oblong, 2.5–3 mm.

Seeds

ovoid to ellipsoid, 1–2 mm, with reticulate pitting.

ellipsoid, 1.5–2 mm; smooth.

2n

=20, 36, 42.

Euphorbia spathulata

Euphorbia cyparissias

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Discussion

Disturbed areas. Flowering Apr–Aug. 100–1000 m. BW, Sisk, WV. CA, ID, WA; throughout most of US, Ontario, Mexico. Native.

See also E. helioscopia.

Disturbed areas. Flowering May–Aug. 0–1600 m. BW, CR, ECas, WV. CA, ID, WA; throughout North America; Asia, Europe. Exotic.

Source Flora of Oregon, volume 2, page 646
Stephen Meyers
Flora of Oregon, volume 2, page 645
Stephen Meyers
Sibling taxa
E. crenulata, E. cyparissias, E. dentata, E. esula, E. helioscopia, E. lathyris, E. myrsinites, E. oblongata, E. peplus
E. crenulata, E. dentata, E. esula, E. helioscopia, E. lathyris, E. myrsinites, E. oblongata, E. peplus, E. spathulata
Synonyms Euphorbia dictyosperma
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