Allium rhizomatum is a species of plant native to southern Arizona (Cochise and Santa Cruz Counties), southern New Mexico (Catron, Grant, Hidalgo, Socorro, Sierra and Eddy Counties) and western Texas (Brewster and Jeff Davis Counties) in the United States, and Chihuahua in Mexico. It is generally found in dry, grassy areas at elevations of 1200–2200 m. Its common names include spreading wild onion and red flower onion.