|Scientific Name||Euphorbia capitellata (Chamaesyce capitellata, Chamaesyce pycnanthema)||USDA PLANTS Symbol||CHCA29|
|Common Name||Head Sandmat||ITIS Taxonomic Serial No.||28050|
|Description||Habitat: Dry areas in gravelly washes, rocky slopes, basaltic talus, disturbed roadsides, desert scrub and grasslands; 1,500 to 5,000 ft.
Plant: Decumbent to erect annual or short-lived perennial a few inches tall with many (5 to 50) slightly hairy to smooth, somewhat branched, stems up to 14 inches long.
Leaves: Opposite,ovate to narrowly ovate, 3/16 to 1 inch long, with asymmetrical bases and acute to obtuse tips; lower margins are serrate, upper are entire, or sometimes both are the same; surfaces are gray-green, smooth or sparsely covered with short hairs.
Inflorescence: Dense, ball-shaped clusters of very small (appearing to be about 1/8-inch across or less) cyathia at the upper leaf axils; cyathia have a reddish, bell-shaped involucre ringed by white "petals" (actually called "appendages") surrounding 4 yellow-green to reddish nectar glands at thei bases; each cyathium with many staminate flowers (stamens and anthers) and one pistillate flower (the ovary) that is smooth or fuzzy with a protruding stigma with 3 styles, each with 2 whitish lobes.
Fruit: Smooth to hairy, tiny, broadly oval-shaped, ~1/16-inch long and as wide.
Bloom Period: April to November.
References: Flora of North America and SEINet; Euphorbia pycnanthema in "Manual of the Vascular Plants of Texas" by Correll and Johnston.
|BONAP Distribution Map
Map Color Key
Banner photo of Lupinus ssp. by Rick Capozza, Austin TX
© Tom Lebsack 2023