ferocactus genus --- cactus family
California barrel cactus (Ferocactus cylindraceus) -- in March -- Organ Pipe Cactus National Monument, AZ yellow & orange AZ-SRN
glaucous barrel cactus (Ferocactus glauescens) -- in April -- Chihuahuan Desert Nature Center, TX yellow & orange TX-W
Mexican lime cactus (Ferocactus pilosus) -- in April -- Chihuahuan Desert Nature Center, TX yellow & orange TX-W
fishhook barrel cactus (Ferocactus wislizenii) -- in July -- Bosque del Apache National Wildlife Refuge, NM yellow & orange NM-S