Flora of the Hawaiian Islands
Dicotyledon Literature for Euphorbia peplus
Wagner et al., 1990, 1999.
   Euphorbiaceae -- The Spurge Family Bibliography
      Euphorbia peplus

Common name(s): spurge, petty spurge
General Information
DistributionNative to temperate Eurasia, now a cosmopolitan weed.In the Hawaiian Islands, naturalized on Kure, Midway, Kaua`i, Maui, Hawai`i.

Annual herbs; stems 1.5-3.5 dm long, glabrous.
Leaves bright green, caducous below, alternate below, becoming opposite or ternate above, membranous, floral leaves smaller, often congested and reflexed, spatulate, 1-1.4 cm long, 0.8-1.2 cm wide, margins entire, apex rounded, base acute or cuneate, petioles 0-0.6 cm long, stipules absent.
Cyathia solitary in the forks of the upper branches, peduncles 0.6-1 mm long; involucre pale green, ca. 1 mm high, glabrous, glands 4, green, crescent-shaped, ca. 0.5 mm long, with slender or filiform horns 0.5-0.7 mm long.
Capsules broadly ovoid, shallowly 3-lobed, 1.8-2 mm long, 2-2.2 mm in diameter.
Seeds gray, ovoid-oblong, weakly 6-angled, ca. 1.5 mm long, ca. 0.8 mm wide, coarsely pitted and minutely white tuberculate, carunculate.
2n = 16