Euphorbia antisyphilitica (Candelilla, Wax plant). Full sun. Hardy to 25°F. Evergreen shrub to 3' tall, mostly leafless stems. Little water. Native to Chihuahuan desert, west Texas, Mexico.
Euphorbia resinifera (Moroccan mound); USDA: 9-11. Full sun to light shade. Hardy to 22°F. Spiny shrub to 4' tall; 6' wide. Moderate water summer. Native to Morocco.
Euphorbia tirucalli (Pencil bush). Sunset: 13, 23, 24, USDA: 10-12 Full sun to light shade. Hardy to 28°F. Succulent bush to 20' tall; Moderate water summer for fast growth. Milky corrosive sap. Origin: Africa.
Pedilanthus macrocarpus (Lady slipper) USDA: 9-10. Full sun to light shade. Little to moderate water. Hardy to 25°F. Evergreen bush to 5' tall; 6' + wide. Origin: Mexico (Sonora, Baja California).