Euphorbia jejuna

M. C. Johnston & Warnock

SouthW. Naturalist 5: 97, fig. [p. 98]. 1960.

Common names: Dwarf broomspurge
Conservation concern
Synonyms: Chamaesyce jejuna (M. C. Johnston & Warnock) Shinners
Treatment appears in FNA Volume 12. Treatment on page 274. Mentioned on page 255, 261.

Herbs, perennial, with woody or fibrous-fleshy, napiform, branched or tuberous taproot, 3–15 mm thick. Stems ascending to erect, densely emerging from woody crown, 5–15 cm, glabrous. Leaves opposite; stipules connate into lacerate or 2-fid, lanceolate or deltate scale, 0.5–0.9 mm, glabrous; petiole 0.3–0.9 mm, glabrous; blade orbiculate-obovate, ovate, or elliptic, 3–6(–8) × 1.8–5 mm, base moderately asymmetric, rounded to truncate, margins entire, apex blunt to acute, surfaces glabrous; 2–3-veined from base but usually only midvein conspicuous. Cyathia solitary at distal nodes; peduncle 0.8–1.5 mm. Involucre broadly campanulate, 1.2–1.5 × 0.8–1.2 mm, glabrous; glands 4, yellowish to green or purplish, oblong, 0.2–0.4 × 0.5–1 mm; appendages erect or spreading, white, 0.3–0.6 × 0.8–1.2 mm, usually deeply dissected into 4–5 acuminate lobes, rarely undivided, when divided distal margin rarely entire or crenate. Staminate flowers 12–35. Pistillate flowers: ovary glabrous; styles 0.4–0.5 mm, unbranched thickened-clavate. Capsules ovoid and broadly triangular, 1.8–2.2(–2.7) × 1.5–2.1 mm, glabrous; columella 1.5–2.2 mm. Seeds whitish, oblong, 4-angled in cross section, adaxial faces concave, with long raphe between, 1.5–2(–2.3) × 0.6–0.8 mm, dimpled with faint irregular transverse wrinkles or with up to 10 low, rounded transverse ridges.

Phenology: Flowering and fruiting early spring–summer.
Habitat: Thin calcareous soils (caliche) on limestone hills.
Elevation: 500–900 m.


V12 381-distribution-map.jpg

Tex., Mexico (Chihuahua, Coahuila).


Euphorbia jejuna is known in the flora area from only a few collections in Mitchell, Nolan, Terrell, and Val Verde counties. The species is very similar to E. astyla, but differs in its more deeply divided involucral gland appendages and more definitely petiolate, rounder leaves.

Selected References


Lower Taxa

... more about "Euphorbia jejuna"
Victor W. Steinmann +, Jeffery J. Morawetz +, Paul E. Berry +, Jess A. Peirson +  and Ya Yang +
M. C. Johnston & Warnock +
Anisophyllum +
Dwarf broomspurge +
Tex. +, Mexico (Chihuahua +  and Coahuila). +
500–900 m. +
Thin calcareous soils (caliche) on limestone hills. +
Flowering and fruiting early spring–summer. +
SouthW. Naturalist +
Conservation concern +
Chamaesyce jejuna +
Euphorbia jejuna +
Euphorbia sect. Anisophyllum +
species +