The genus
Thelocactus
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argenteus
aurantiacus
bicolor
bolaensis
buekii
conothelos
flavidispinus
flavus
freudenbergeri
garciae
hastifer
heterochromus
hexaedrophorus
hintonii
lausseri
leucacanthus
macdowellii
multicephalus
nidulans
rinconensis
schmollii
schwarzii
tepelmemensis
tulensis