Family: Spurge (Euphorbiaceae)
Size: 0.25 in.
Notes: Ovaries are heart-shaped (bilobed); leaves are toothed. More than 3 dozen species of Euphorbia in Arizona.
This plant is found on the Appleton-Whittell Research Ranch Working Check list of flora.
Squareseed Spurge plant profile on the USDA Plants server.