Euphorbia cuphosperma |
Euphorbia helioscopia |
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mad woman's milk, wartweed |
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Habit | Herbs annual, 1–5 dm; stems,erect, glabrous to sparsely hairy. | |
Leaves | alternate (upper leaves may be opposite), obovate to spatulate, 10–30 × 5–15 mm; margins toothed in at least upper 25%; entire below; tips rounded; surfaces glabrous, sessile. |
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Inflorescences | involucres cone-shaped, 1–1.5 mm; glands not horned. |
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Flowers | styles divided less than halfway to base. |
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Fruits | round, 2.5–3 mm. |
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Seeds | ovoid, 1.5–2.5 mm, with reticulate pitting. |
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Euphorbia cuphosperma |
Euphorbia helioscopia |
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Distribution | ||
Discussion | Disturbed areas. Flowering Apr–Jul. 0–200 m. CR, WV. CA, WA; scattered throughout North America; Asia, Europe. Exotic. Euphorbia helioscopia is easily confused with E. spathulata. The former is an exotic species introduced from Eurasia, while E. spathulata is considered native. The most reliable characteristic separating these taxa is the size of the involucres. |
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Source | Flora of Oregon, volume 2, page 645 Stephen Meyers |
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Sibling taxa | ||
Web links |
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