Echinocereus Online - An electronic magazine about the genus, in German and English. Includes many images. Echinocereus blankii - image Echinocereus pentalophus - image Echinocereus stoloniferus ssp. tayopensis - Photographs and information on this species. Echinocereus triglochidiatus - Photographs and description of the Hedgehog or Claret Cup Cactus and information on its habitat and range. Echinocereus subinermis - Photographs and information on this species. Echinocereus websterianus - Photographs and information on this species. Echinocereus pentalophus - General information and classification.