Euphorbia spathulata |
Euphorbia cyparissias |
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prairie spurge |
cypress spurge |
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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. |
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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. |
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Euphorbia spathulata |
Euphorbia cyparissias |
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Distribution | ||
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 | ||
Synonyms | Euphorbia dictyosperma | |
Web links |
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