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

Common name(s): spurge, graceful spurge
General Information
DistributionNative from southern United States to Argentina and the West Indies, widely naturalized in the Paleotropics.In the Hawaiian Islands, naturalized on Kure, Midway, French Frigate Shoals, Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Hawai`i.

Glabrous annual herbs; stems erect or ascending, 0.1-0.5 m long.
Leaves oblong to oblong-lanceolate, 6-35 mm long, 4-12 mm wide, conspicuously veined, margins serrate, apex rounded or obtuse, base obtuse to cordate, petioles 1-1.5 mm long, stipules connate, deltate, membranous, 1-2 mm long, sometimes ciliate on the inner edge.
Cyathia in lateral, terminal, nearly leafless, few-flowered cymes; involucre 0.5-1 mm high, glabrous, glands 5, elliptic to suborbicular, 0.05-0.2 mm long, appendages white to pink, rotund and usually ca. 3 times as wide as the larger glands, sometimes absent; male flowers 2-20 per cyathium.
Capsules subglobose, 3-angled, the angles rounded, 1-1.5 mm long, 1.2-1.5 mm in diameter, usually broadest at middle, glabrous.
Seeds brown, ovoid, obtusely 4-angled, ca. 0.8 mm long, the faces wrinkled.
2n = 16, 28, 56