DESCRIPTION: Annual or perennial, mostly forming low mats. Flowers white with dark center, shaped like a butterfly to 1/8" wide. Flowers lack sepals or petals and are contained in the dark center of the flowerlike cup. Leaves simple, smooth-edged, oblong to 3/8" long. Euphorbiaceae (Spurge) Family.
NATURAL HISTORY: Flowers bloom spring and summer. Fifteen species of Euphorbia were found in the Tucson Mountains by Rondeau et al. (1996).