Plant: Erect annual forb to 20 cm; herbage with milky sap Leaves: leaves opposite,inequilateral at base, linear, 3-5 cm long Flowers: flowers monoecious borne in cyathia; petaloid appendages white aging pink, conspicuous; ovary and capsule glabrous, ~3mm long; seeds with 2(3) low transverse ridges. Notes: Petaloid appendages large.Flowers borne on a cyanthia. References: Kearney & Peebles; Arizona Flora. ASU specimans