Euphorbia carunculata

Waterfall

Rhodora 50: 63. 1948.

Common names: Sand-dune sandmat or spurge
Synonyms: Chamaesyce carunculata (Waterfall) Shinners
Treatment appears in FNA Volume 12. Treatment on page 262. Mentioned on page 252, 257, 263.
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Herbs, annual, with taproot. Stems prostrate, spreading and lanky or occasionally mat-forming, ± succulent, 70–150 cm, glabrous. Leaves opposite; stipules usually distinct, occasionally connate basally (primarily at distal nodes), usually divided into 2–5 subulate to subulate-filiform segments, occasionally forming narrow deltate segments (primarily at distal nodes), 0.8–1.8 mm, glabrous; petiole 3.1–6.3 mm, glabrous; blade ovate to elliptic-oblong, 5–26 × 4–12 mm, base subsymmetric to symmetric, rounded to cuneate, margins entire, apex usually mucronate, rarely acute or obtuse, surfaces glabrous; pinnately veined. Cyathia solitary at distal nodes; peduncle 1.4–3.6 mm. Involucre campanulate, 1.1–1.8 × 1.5–2.5 mm, glabrous; glands 4, yellowish, sessile or short stipitate, circular to oblong, 0.5–0.7 × 0.5–0.8 mm; appendages white to yellowish, ovate to oblong, occasionally rudimentary, (0–)0.8–1.2 × 0.8–1.5 mm, distal margin entire. Staminate flowers 15–25. Pistillate flowers: ovary glabrous; styles 0.7–1 mm, 2-fid 1/2 length. Capsules ovoid, 4.7–5.5(–6) × 3.6–5.1 mm, glabrous; columella 4.3–5.1 mm. Seeds grayish white to reddish brown mottled, bottle-shaped, strongly dorsiventrally compressed and weakly 3-angled in cross section, (2.8–)4.1–5.2 × 1.2–2(–3.4) mm, smooth; carunclelike structure linear, 0.4–0.5 × 0.1–0.2 mm.


Phenology: Flowering and fruiting summer–fall.
Habitat: Sand dunes.
Elevation: 400–1300 m.

Distribution

V12 1054-distribution-map.jpg

Kans., N.Mex., Okla., Tex., Mexico (Chihuahua).

Discussion

Euphorbia carunculata has a highly localized and scattered distribution. The species is restricted to sand dunes and known from only a handful of localities throughout its relatively wide range. The seeds are unique in being bottle-shaped and strongly laterally compressed, and unlike other members of sect. Anisophyllum, there is a minute, linear, carunclelike protuberance at the hilum.

Selected References

None.

Lower Taxa

None.
... more about "Euphorbia carunculata"
Victor W. Steinmann +, Jeffery J. Morawetz +, Paul E. Berry +, Jess A. Peirson +  and Ya Yang +
Waterfall +
Anisophyllum +
Sand-dune sandmat or spurge +
Kans. +, N.Mex. +, Okla. +, Tex. +  and Mexico (Chihuahua). +
400–1300 m. +
Sand dunes. +
Flowering and fruiting summer–fall. +
Chamaesyce carunculata +
Euphorbia carunculata +
Euphorbia sect. Anisophyllum +
species +