Children (80 direct children, 165 direct and indirect children):
Ferocactus cylindraceus
(tree size 9)
California barrel cactus
Ferocactus pilosus
Ferocactus histrix
Ferocactus hamatacanthus
(tree size 4)
Turk's head
Ferocactus wislizeni
(tree size 9)
Southwestern barrel cactus
Ferocactus viridescens
(tree size 6)
San diego barrel cactus
Ferocactus latispinus
(tree size 7)
Ferocactus gracilis
(tree size 5)
Ferocactus herrerae
Cactus
Ferocactus pottsii
(tree size 1)
Ferocactus pottsi
Ferocactus emoryi
(tree size 3)
Emory's barrel cactus
Ferocactus flavovirens
Ferocactus schwarzii
Ferocactus alamosanus
(tree size 3)
Ferocactus robustus
Cactus
Ferocactus chrysacanthus
(tree size 2)
Ferocactus echidne
(tree size 3)
Ferocactus diguetii
(tree size 2)
Ferocactus glaucescens
Ferocactus eastwoodiae
California barrel cactus
Ferocactus fordii
(tree size 3)
Cactus
Ferocactus haematacanthus
Ferocactus johnstonianus
Ferocactus lindsayi
Ferocactus peninsulae
(tree size 7)
Ferocactus macrodiscus
(tree size 3)
Cactus
Ferocactus santa-maria
Ferocactus tiburonensis
Cactus
Ferocactus townsendianus
Ferocactus rectispinus
Ferocactus acanthodes
(tree size 10)
Ferocactus recurvus
(tree size 3)
Ferocactus tortulispinus
Ferocactus lecontei
Ferocactus scheeri
Ferocactus uncinatus
Ferocactus sect. bisnaga
Ferocactus sect. ferocactus
Ferocactus stainesii
(tree size 3)
Ferocactus pringlei
Ferocactus horridus
Ferocactus covillei
Ferocactus orcuttii
Ferocactus melocactiformis
Ferocactus johnsonii
Ferocactus nobilis
Ferocactus crassihamatus
Ferocactus rostii
Ferocactus coloratus
Ferocactus viscainensis
Ferocactus tobuschii
Ferocactus glaucus
Ferocactus mesae-verdae
Ferocactus pubispinus
Ferocactus gatesii
Ferocactus setispinus
Ferocactus subg. ferocarpus
Ferocactus reppenhagenii
Ferocactus mathssonii
Ferocactus arizonicus
Ferocactus bicolor
(tree size 1)
Ferocactus californicus
Ferocactus coptonogonus
Ferocactus crispatus
Ferocactus falconeri
Ferocactus ×grandiflorus
Ferocactus hastifer
Ferocactus heterochromus
Ferocactus leucacanthus
Ferocactus parviflorus
Ferocactus phoeniceus
Ferocactus phyllacanthus
Ferocactus piliferus
(tree size 1)
Ferocactus polyancistrus
Ferocactus rafaelensis
Ferocactus spinosior
Ferocactus vaupelianus
Ferocactus victoriensis
Ferocactus whipplei
Ferocactus wrightiae