Euphorbia cordifolia |
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heartleaf sandmat |
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Habit | Herbs, annual, with taproot. |
Stems | prostrate, occasionally mat-forming, 10–43 cm, glabrous. |
Leaves | opposite; stipules usually distinct, occasionally connate at base, filiform, 1–1.2(–2.8) mm, usually glabrous, rarely pilose; petiole 0.4–1 mm, usually glabrous; blade ovate to oblong, 4.4–12 × 2.6–7.6 mm, base asymmetric, cordate to rounded, margins entire, apex rounded to mucronulate, surfaces glabrous; only midvein conspicuous. |
Involucre | campanulate, 1–1.3 × 1–1.3 mm, glabrous; glands 4, yellowish to pink, elliptic, 0.3–0.5 × 0.5–1 mm; appendages whitish to pink, sometimes drying red, elliptic to ovoid, 1.1–1.5 × 1.2–1.9 mm, distal margin entire, retuse, or erose. |
Staminate flowers | 5–40. |
Pistillate flowers | ovary glabrous; styles 0.5–0.8 mm, 2-fid nearly entire length. |
Capsules | ovoid, 2–3 mm diam., glabrous; columella 1.2–2.7 mm. |
Seeds | gray or tan with dark brown mottling, ovoid, bluntly 3–4-angled in cross section, 1.8–2.1 × 1.2–1.4 mm, smooth to rugose. |
Cyathia | solitary at distal nodes; peduncle 0.9–3 mm. |
Euphorbia cordifolia |
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Phenology | Flowering and fruiting summer–fall. |
Habitat | Xeric oak-pine scrub, pine-barrens, sand barrens, sandy stream banks. |
Elevation | 0–200 m. (0–700 ft.) |
Distribution |
AL; AR; FL; GA; LA; MS; NC; OK; SC; TX
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Discussion | Euphorbia cordifolia is easily identified by its cordate to rounded leaf base and distinctive filiform stipules. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 12, p. 265. |
Parent taxa | Euphorbiaceae > Euphorbia > sect. Anisophyllum |
Sibling taxa | |
Synonyms | Chamaesyce cordifolia |
Name authority | Elliott: Sketch. Bot. S. Carolina 2: 656. (1824) |
Web links |