Spotted spurge is a weed of lawns. It has red spots on the leaf and is prostrate. The sap is milky and is said to be irritating. An annual, it germinates later than most broadleaf annuals. Two related species do not have the spot but are prostrate and have the milky sap.
Photo by Dr. John Meade, weed scientist emeritus
Rutgers NJAES Cooperative Extension