Euphorbia ocellata |
Euphorbia ocellata subsp. ocellata |
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Contura Creek sandmat, Contura Creek spurge, valley spurge |
valley spurge |
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Habit | Herbs, annual, with taproot. | |||||
Stems | prostrate, 10–35 cm, glabrous or pilose. |
10–35 cm, glabrous. |
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Leaves | opposite; stipules distinct, subulate, 0.5–1.6 mm, glabrous or pilose; petiole 0.3–2 mm, glabrous or pilose; blade ovate to deltate or falcate, 2.3–13 × 1.5–6 mm, base asymmetric, usually cordate, rarely rounded, margins occasionally reddish, entire, often revolute, apex acute to obtuse, occasionally mucronate, surfaces glabrous or pilose; midvein conspicuous, lateral veins frequently visible abaxially. |
stipules 0.5–1.6 mm, glabrous; petiole 0.3–1.2 mm, glabrous; blade 2.3–13 × 1.5–6 mm, apex acute, occasionally mucronate, surfaces glabrous; lateral veins frequently visible abaxially. |
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Peduncle | 0.9–2 mm. |
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Involucre | campanulate, 1–2.5 × 1.3–2.4 mm, glabrous or pilose; glands 4, yellow becoming deep red, elliptic or oblong to orbiculate, 0.4–0.6 × 0.5–0.7 mm; appendages absent or whitish, orbiculate, 0.1–0.2 × 0.3–0.5 mm, distal margin entire. |
1–1.8 × 1.3–2.4 mm, glabrous; gland appendages absent. |
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Staminate flowers | 30–70. |
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Pistillate flowers | ovary glabrous or pilose; styles 0.4–0.5 mm, 2-fid at apex. |
ovary glabrous. |
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Capsules | subglobose to broadly ovoid, 1.4–2.7 × 1.9–3.1 mm, glabrous or pilose; columella 1.4–2 mm. |
1.4–2.7 × 1.9–2.6 mm, glabrous; columella 1.4–2 mm. |
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Seeds | whitish gray to black, ovoid to oblong, terete to bluntly subangled in cross section, 1.1–1.7 × 0.8–1.3 mm, rugose or smooth. |
whitish gray, ovoid, 1.1–1.6 × 0.9–1.3 mm, rugose or smooth. |
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Cyathia | solitary at distal nodes; peduncle 0.9–2.2 mm. |
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Euphorbia ocellata |
Euphorbia ocellata subsp. ocellata |
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Phenology | Flowering and fruiting early spring–fall. | |||||
Habitat | Sandy soils, dunes, river washes, hard clay soils, roadsides. | |||||
Elevation | 80–1000 m. (300–3300 ft.) | |||||
Distribution |
AZ; CA; ID; NV; UT
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AZ; CA; ID; NV; UT |
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Discussion | Subspecies 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Plants with smooth, round seeds and larger, ovate to lanceolate (and not usually falcate) leaves have been segregated as E. ocellata subsp. arenicola. Leaf size and shape and seed surface sculpturing, however, vary considerably across the species range, and most individuals appear intermediate. Therefore a variable and more broadly defined subsp. ocellata is recognized here. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 12, p. 279. | FNA vol. 12, p. 279. | ||||
Parent taxa | Euphorbiaceae > Euphorbia > sect. Anisophyllum | Euphorbiaceae > Euphorbia > sect. Anisophyllum > Euphorbia ocellata | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Chamaesyce ocellata | Chamaesyce arenicola, C. ocelleta subsp. arenicola, E. arenicola, E. ocellata subsp. arenicola, E. ocelleta var. arenicola, E. ocelleta var. kirbyi | ||||
Name authority | Durand & Hilgard: Pl. Heermann., 46. (1854) | unknown | ||||
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