Euphorbia exigua


Sp. Pl. 1: 456. 1753.

Common names: Dwarf or small spurge
Synonyms: Tithymalus exiguus (Linnaeus) Hill
Treatment appears in FNA Volume 12. Treatment on page 302. Mentioned on page 296, 297, 299.

Herbs, annual, with taproot. Stems erect, unbranched or branched, 3–30 cm, glabrous. Leaves: petiole 0–0.5 mm; blade linear, linear-oblong, or linear-spatulate, 2–30 × 1–5 mm, base cuneate or truncate, margins entire, apex acute, obtuse, or emarginate, surfaces glabrous; venation inconspicuous, only midvein prominent. Cyathial arrangement: terminal pleiochasial branches 3–5, each 1–3 times 2-branched; pleiochasial bracts similar in shape and size to or sometimes slightly longer and wider than distal leaves; dichasial bracts distinct, linear, or linear-lanceolate, or lanceolate-ovate, base rounded to subcordate, margins entire, apex acute; axillary cymose branches 0–5. Cyathia: peduncle 0–2 mm. Involucre cupulate, 0.3–0.5 × 0.6–0.8 mm, glabrous; glands 4, elliptic to crescent-shaped, 0.2–0.4 × 0.3–0.6 mm; horns divergent, 0.2–0.5 mm. Staminate flowers 5–8. Pistillate flowers: ovary glabrous; styles 0.5–0.7 mm, 2-fid. Capsules subglobose, 1–1.8 × 1.3–2 mm, slightly lobed; cocci rounded, smooth, puncticulate toward abaxial line, glabrous; columella 1.1–1.4 mm. Seeds blackish to grayish, 4-angled-ovoid, 1–1.5 × 0.5–0.7 mm, white, tuberculate; caruncle conic or subconic, 0.1–0.3 × 0.1–0.3 mm.

Phenology: Flowering and fruiting summer–fall.
Habitat: Edges of gardens, roadsides, waste places.
Elevation: 0–1500 m.


V12 555-distribution-map.jpg

Introduced; B.C., N.S., Ont., Calif., N.Y., W.Va., Europe, w Asia, n Africa, Atlantic Islands (Macaronesia).


Euphorbia exigua can be easily distinguished from other annual species of the genus in the flora area by its tuberculate seeds.

Selected References


Lower Taxa

... more about "Euphorbia exigua"
Ricarda Riina +, Dmitry V. Geltman +, Jess A. Peirson +  and Paul E. Berry +
Linnaeus +
Dwarf or small spurge +
B.C. +, N.S. +, Ont. +, Calif. +, N.Y. +, W.Va. +, Europe +, w Asia +, n Africa +  and Atlantic Islands (Macaronesia). +
0–1500 m. +
Edges of gardens, roadsides, waste places. +
Flowering and fruiting summer–fall. +
Introduced +
Tithymalus exiguus +
Euphorbia exigua +
Euphorbia subg. Esula +
species +