Echinocactus williamsii Lemaire
      
no HD illustration available (m3)
2 369738 Echinocactus williamsii Lemaire Cactaceae
L.K.G. Pfeiffer, F. Otto, Abbild. Beschr. Cact. (Coloured version), vol. 2 : p. 21, t. 21 (1839)