ferocactus genus --- cactus family

California barrel cactus (Ferocactus cylindraceus) -- in March --  Organ Pipe Cactus National Monument, AZ       yellow & orange  

glaucous barrel cactus (Ferocactus glauescens) -- in April -- Chihuahuan Desert Nature Center, TX   yellow & orange   

Mexican lime cactus (Ferocactus pilosus) -- in April -- Chihuahuan Desert Nature Center, TX    yellow & orange 

fishhook barrel cactus (Ferocactus wislizenii) -- in July -- Bosque del Apache National Wildlife Refuge, NM      yellow & orange