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

Common name(s): spurge, Mexican fire plant, wild pointsettia
General Information
DistributionNative from eastern and southern United States to northern South America and the West Indies, naturalized in parts of the Old World.In the Hawaiian Islands, naturalized on Midway, Kaua`i, O`ahu, Moloka`i, Maui, Hawai`i.

Glabrous annual herbs; stems green, ascending, somewhat glaucous, 1-5 dm long.
Leaves green, floral leaves usually red at least at base, alternate toward base of stems, opposite above, linear, ovate, or panduriform, 2-15 cm long, 0.1-4 cm wide, margins entire to coarsely dentate, apex acute or rarely short-acuminate, base cuneate.
Cyathia in dense terminal cymes; involucre ca. 3 mm high, glabrous, gland 1, bilabiate, flattened, without an appendage.
Capsules broadly ovoid, 3-4 mm long.
Seeds ovoid-cylindrical, the ends truncate or rounded, 2.5-3 mm long, the surface finely and sharply tuberculate, ecarunculate.