Machaerocereus Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 2: 114, 1920

Machaerocereus eruca (Brandegee) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 2: 115-116, f. 171-172, 1920

Machaerocereus gummosus (Engelmann) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 2: 116-117, f. 173-175, 1920