Flora of the Hawaiian Islands
Dicotyledon Literature for Euphorbia prostrata
Wagner et al., 1990, 1999; Lorence & Wagner, 2020.
   Euphorbiaceae -- The Spurge Family Bibliography
      Euphorbia prostrata
General Information
DistributionNative from southern United States to South America, the West Indies, and the Paleotropics.In the Hawaiian Islands, naturalized on Midway, Ni`ihau, Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Kaho`olawe, Hawai`i.
















Habit
Mat-forming annual herb; stems 7–20 cm, often purplish, prostrate, crisp pubescent to pilose or sometimes glabrate.
Leaves
Leaves distichous, slightly unequal; blade oblong to ovate-oblong, 3–9 mm long, 1.5–5 mm wide, sparsely pubescent or sometimes glabrate, margin serrate, apex rounded or obtuse, base rounded; petiole 0.5–1 mm long; stipules ± distinct, linear lanceolate, 1–2 mm long, ciliate.
Flowers
Cyathia solitary at nodes of short, congested, leafy, lateral shoots; involucre purple, 0.4–0.7 mm high, sparsely villous or glabrous, glands 4, maroon, suborbicular, 0.05–0.15 mm long, appendages minute, pinkish white, shorter than the gland is wide. Staminate flowers 2–5 per cyathium.
Fruit
Fruit ovoid, 3-angled, 1–1.4 mm long, pilose on the angles, otherwise glabrous.
Seeds
Seeds gray to tan, narrowly ovoid, strongly 4-angled, ca. 1 mm long, faces strongly ridged.
Chromosomes
2n = 18, 20.
Contributor
Nancy Khan