Euphorbia agraria |
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urban spurge |
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Habit | Herbs, perennial, with slender, spreading rootstock. |
Stems | erect or ascending, unbranched or branched, 30–90 cm, glabrous. |
Leaves | petiole absent; blade oblong-elliptic, 20–65 × 9–20 mm, base truncate to auriculate, margins entire, apex obtuse to rounded, surfaces glabrous; venation conspicuously pinnate, midvein prominent. |
Involucre | campanulate, 2.2–3 × 1.8–2 mm, glabrous; glands 4, crescent-shaped; 0.6–1 × 1–2 mm; horns slightly divergent to convergent, 0.1–0.2 mm. |
Staminate flowers | 15–20. |
Pistillate flowers | ovary glabrous; styles 1.2–2 mm, 2-fid. |
Capsules | globose, 2–2.8 × 2.2–2.7 mm, 3-lobed; cocci rounded, smooth except finely granulate toward abaxial line, glabrous; columella 2.1–2.7 mm. |
Seeds | gray or whitish, ovoid-oblong, 2–2.1 × 1.2–1.3 mm, smooth; caruncle ± rounded and flattened, 0.8 × 0.6 mm. |
Cyathial | arrangement: terminal pleiochasial branches 8–15, 1–2 times 2-branched; pleiochasial bracts similar in shape but shorter and narrower than distal leaves; dichasial bracts distinct, rhombic to reniform, base obtuse, margins entire, apex obtuse, mucronate; axillary cymose branches 12–23. |
Cyathia | peduncle 0–2 mm. |
Euphorbia agraria |
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Phenology | Flowering and fruiting spring–summer. |
Habitat | Grasslands, roadside banks, pastures. |
Elevation | 200–1600 m. (700–5200 ft.) |
Distribution |
KS; MT; NE; NY; PA; WA; WY; AB; SK; Europe [Introduced in North America]
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Source | FNA vol. 12, p. 298. |
Parent taxa | Euphorbiaceae > Euphorbia > subg. Esula |
Sibling taxa | |
Synonyms | Tithymalus agrarius |
Name authority | M. Bieberstein: Fl. Taur.-Caucas. 1: 375. (1808) |
Web links |