Euphorbia indivisa

(Royal Sandmat)


Euphorbia indivisa, Davis Mountains State Park, Jeff Davis Co. 5938-2


Euphorbia indivisa, Davis Mountains State Park, Jeff Davis Co. 5938-1

Scientific Name Euphorbia indivisa (Chamaesyce dioica, Euphorbia dioica var. indivisa) USDA PLANTS Symbol EUIN3
Common Name Royal Sandmat ITIS Taxonomic Serial No. 28086
Family Euphorbiaceae (Spurge) SEINet
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Description Habitat: Dry rocky or sandy soils, especialy igneous soils, in creekbeds, grasslands and woodlands; 4,000-6,000 ft.
Plant: Inconspicous, weedy-looking prostrate annual with pubescent stems branching from central point, 2 to 10 inches long; herbage with milky sap.
Leaves: Opposite, oblong, ovate or narrowly obovate, up to nearly 1/2-inch long and less than 1/4-inch wide; bases very unsymmetrical; serrulate, especially near the tip; upper surface smooth with occational hairs, lower surface hairier.
Inflorescence: Very small flowers (called cyathia in spurges) in small congested clusters on branches; 4 pink to reddish, unequal petals (called appendages), two larger and two much smaller; male (staminate) and female (pistillate) flowers are separate, 5 to 15 staminate flowers and 3 pistillate flowers in each cyathium.
Fruit: Female flower becoming a very small, somewhat pear-shaped, hairy capsule less than 0.1-inch long.
Bloom Period: July to September.
References: "Manual of the Vascular Plants of Texas" by Correll and Johnston, Vascular Plants of the Gila Wilderness, SEINet, Flora of North America and The New Mexico Botanist.
BONAP Distribution Map

Map Color Key
Texas Status:

Banner photo of Castilleja indivisa and Lupinus ssp. taken along FM 1323 north of Johnson City, Blanco County

© Tom Lebsack 2024