Euphorbia lata |
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broadleaf spurge, hoary sandmat |
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Habit | Herbs, perennial, with moderately thickened to robust rootstock. |
Stems | ascending to erect, or prostrate, 10–25 cm, strigose to short-sericeous or ± villous. |
Leaves | opposite; stipules distinct, filiform, 0.8–1.3 mm, strigose to short-sericeous or ± villous; petiole 0.5–2 mm, densely strigose to short-sericeous or ± villous; blade narrowly to broadly ovate-deltate, older ones often falcate, 4–12 × 3–7 mm, base asymmetric, obliquely rounded to obtuse, noticeably wider on one side, margins entire, often ± revolute, apex broadly acute, surfaces strigose to short-sericeous or ± villous; obscurely 3–5-veined from base, midvein prominent abaxially. |
Involucre | broadly campanulate, 2–2.5 × 2.2–2.6, strigose; glands 4, greenish, oblong to semilunate, 0.2–0.7 × 0.6–1 mm; appendages rudimentary or white, forming narrow band, (0–)0.1–0.2 × (0–)0.6–1 mm, distal margin entire or crenate. |
Staminate flowers | 25–35. |
Pistillate flowers | ovary densely strigose to short-sericeous or ± villous; styles dark purplish, 0.8–1.2 mm, 2-fid 1/2 to nearly entire length. |
Capsules | ovoid, 1.9–2.3 × 2–2.4 mm, strigose to short-sericeous or ± villous; columella 1.7–2.2 mm. |
Seeds | whitish, oblong, 4-angled in cross section, faces concave, 1.5–1.8(–2) × 0.6–0.9 mm, smooth. |
Cyathia | solitary at distal nodes; peduncle 1–3 mm. |
2n | = 28, 56. |
Euphorbia lata |
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Phenology | Flowering and fruiting spring–fall. |
Habitat | Mountain slopes, canyons, basins, rocky prairies, roadsides, disturbed sites, usually in calcareous soils, sometimes in igneous-derived, sandy or rocky soils. |
Elevation | 600–2200 m. (2000–7200 ft.) |
Distribution |
CO; KS; NM; OK; TX; Mexico (Chihuahua, Coahuila)
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Source | FNA vol. 12, p. 275. |
Parent taxa | Euphorbiaceae > Euphorbia > sect. Anisophyllum |
Sibling taxa | |
Synonyms | E. dilatata, Chamaesyce lata, E. rinconis |
Name authority | Engelmann: in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 188. (1859) |
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