Corrugate-seeded Spurge, Ribseed Sandmat, Rib-seed Sandmat, Ridge-seeded Spurge: Chamaesyce glyptosperma (Synonym: Euphorbia glyptosperma) - (Note: This is considered Euphorbi glyptosperma in Washington.)
Milk Spurge, Spotted Sandmat, Spotted Spurge: Chamaesyce maculata (Synonyms: Chamaesyce maculata, Chamaesyce mathewsii, Chamaesyce supina, Chamaesyce tracyi, Euphorbia maculata, Euphorbia supina) - (Note: This is considered Euphorbi maculata in Washington.)
Thymeleaf Sandmat, Thyme-leaf Spurge, Thyme-leaved Spurge: Chamaesyce serpyllifolia (Synonyms: Chamaesyce albicaulis, Chamaesyce neomexicana, Chamaesyce serpyllifolia ssp. serpyllifolia, Euphorbia neomexicana, Euphorbia serpyllifolia) - (Note: This is considered Euphorbi serpyllifolia in Washington.)
Urban Spurge: Euphorbia agraria -
Cypress Spurge: Euphorbia cyparissias (Synonyms: Galarhoeus cyparissias, Tithymalus cyparissias) -
Toothed Spurge: Euphorbia dentata -
Cushion Spurge: Euphorbia epityhymoides -
Esula Spurge, Leafy Spurge, Wolf's Milk: Euphorbia esula (Synonyms: Euphorbia esula var. esula, Euphorbia intercedens, Euphorbia podperae, Euphorbia pseudovirgata, Euphorbia virgata, Galarhoeus esula, Tithymalus esula) - (Note: This is considered Euphorbi virgata in Washington.)
Caper Spurge, Gopher Plant, Mole Plant: Euphorbia lathyris -
Broad-leaved Glaucous Spurge, Myrtle Spurge, : Euphorbia myrsinites (Synonym: Tithymalus myrsinites) -
Petty Spurge: Euphorbia peplus (Synonyms: Galarhoeus peplus, Tithymalus peplus) -
Prairie Spurge, Reticulate-seeded Spurge, Spathulate-seeded Spurge, Warty Spurge: Euphorbia spathulata (Synonyms: Euphorbia alta, Euphorbia arkansana, Euphorbia dictyosperma, Euphorbia obtusata, Galarhoeus arkansanus, Galarhoeus obtusatus, Tithymalus arkansanus, Tithymalus missouriensis, Tithymalus obtusatus, Tithymalus spathulatus) -
Leafy Spurge, Wolf's Milk: Euphorbia virgata (Note: This is considered Euphorbia esula in Oregon.)