Carnegie Institution of Washington publication. . Figs. 182 and 183.—Echinocactus grusonii. Fifi. 184.—Flower of Echino- cactus grusonii. X0.8. Echinocereus grusonii azureus is a form incidentally mentioned by Von Zeisold (Monats- schr.
х Echinoferocactus (E. grusonii x F. schwarzii) f. variegata
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