Echinomastus johnstonii (Parry ex Engelm.) E.M.Baxter, Calif. Cactus: 75. 1935
Echinomastus johnstonii, Calif. Cactus: 75. 1935
is new combination for Echinocactus johnsonii, Botany (Fortieth Parallel): 117. 1871
Echinomastus johnstonii, Calif. Cactus: 75. 1935
Taxon for this name