Allium monanthum is unusual in the genus in being usually dioecious (male and female flowers on separate plants), but rarely hermaphrodite or gynomonoecious. The species produces a single round bulb about  in diameter. Scapes are relatively short for the genus, rarely more than  tall.
Allium monanthum is unusual within its genus in being usually dioecious (male and female flowers on separate plants), but rarely hermaphrodite or gynomonoecious. The species produces a single round bulb approximately 1 inch in diameter. Scapes are relatively short for the genus, rarely more than 6 inches tall.