Cactus (Cactaceae) family
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saguaro cactus (Carnegiea giganteus) -- in March -- Organ Pipe Cactus National Monument, AZ white & cream AZ-SRN
jumping cholla (Cylindropuntia fulgida) -- in March -- Sonoran Desert National Monument, AZ green & brown AZ-S
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jumping cholla (Cylindropuntia fulgida) -- in March -- Organ Pipe Cactus National Monument, AZ
tree cholla (Cylindropuntia imbricata) -- in March -- near Walsenberg, CO red & pink CO-G
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tree cholla (Cylindropuntia imbricata) -- in April -- Mills Canyon, Kiowa National Grassland, NM red & pink NM-N
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walkingstick cactus (Cylindropuntia spinosior) -- in April -- Villanueva State Park, NM red & pink NM-N
whipple cactus (Cylindropuntia whipplei) -- in March -- Four Corners, NM green & brown NM-N
cottontop cactus (Echinocactus polycephalus) -- in March -- Death Valley National Park, CA yellow & orange
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scarlet hedgehog cactus (Echinocereus coccineus var. coccineus) -- in March -- San Xavier Mission, AZ red & pink
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Texas claret-cup cactus (Echinocereus coccineus var. paucispinus -- in April -- Big Bend Ranch State Park, TX red & pink
Engelmann's hedgehog cactus (Echinocereus engelmannii) -- in March -- U.S. 95 in southern Nevada red & pink NV-S
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strawberry hedgehog cactus (Echinocereus enneacanthus) -- in April -- Big Bend National Park, Texas red & pink
Boyce-Thompson hedgehog cactus (Echinocereus fendleri) -- in March -- Organ Pipe Cactus National Monument, AZ red & pink AZ-SRN
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strawberry cactus (Echinocereus stramineus var. stramineus) -- in April -- Big Bend Ranch State Park, TX red & pink
kingcup cactus (Echinocereus triglochidiatus) -- in May -- Yampa Bench Road, Dinosaur National Monument, CO red & pink
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hen-and-chickens (Echinocereus viridiflorus) -- in June -- South Valley Loop Trail, Lory State Park, CO green & brown CO-LSP
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hen-and-chickens (Echinocereus viridiflorus) -- in May -- Pawnee National Grassland, CO
nylon hedgehog cactus (Echinocereus viridiflorus var. chloranthus) -- in April -- Chihuahuan Desert NC green & brown TX-W
Correll's hedgehog (Echinocereus viridiflorus var. correllii) -- in April -- Chihuahuan Desert NC, TX green & brown TX-W
small-flowered hedgehog (Echinocereus viridiflorus var. cylindricus) -- in April -- Chihuahuan Desert NC green & brown TX-W
rusty hedgehog cactus (Echinocereus viridiflorus var. russanthus) -- in April -- Chisos Mts., Big Bend National Park, TX red & pink
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Hester's pincushion cactus (Escobaria hesteri) -- in April -- Chihuahuan Desert Nature Center, TX red & pink TX-W
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nipple cactus (Escobaria missouriensis) -- in May -- Mill Creek Link Trail, Lory State Park, CO green & brown CO-LSP
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silverlace cactus (Escobaria sneedii) -- in April -- Big Bend Ranch State Park, TX red & pink
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spinystar (Escobaria vivipara) -- in June -- Mt. Margaret, Red Feather Lakes Area, CO red & pink CO-M
California barrel cactus (Ferocactus cylindraceus) -- in March -- Organ Pipe Cactus National Monument, AZ yellow & orange AZ-S
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glaucous barrel cactus (Ferocactus glauescens) -- in April -- Chihuahuan Desert Nature Center, TX yellow & orange TX-W
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fishhook barrel cactus (Ferocactus wislizenii) -- in July -- Bosque del Apache National Wildlife Refuge, AZ yellow & orange NM-S
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fishhook barrel cactus (Ferocactus wislizenii) -- in April -- Chihuahuan Desert Nature Center, TX yellow & orange TX-W
eagle-claw cactus (Glandulicactus uncinatus) -- in April -- Chihuahuan Desert Nature Center, TX red & pink TX-W
cholla organillo (Grusonia bradtiana) -- in April -- Big Bend Ranch State Park, TX yellow & orange TX-BBR
Graham's nipple cactus (Mammillaria grahamii) -- in April -- Palm Canyon, Kofa NWR, AZ red & pink AZ-S
little nipple cactus (Mammillaria meiacantha) -- in April -- Chihuahuan Desert Nature Center, TX green & brown TX-W
Chihuahuan beehive (Neolloydia conoidea) -- in April -- Chihuahuan Desert Nature Center, TX red & pink TX-W
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buckhorn cholla (Opuntia acanthocarpa) -- in March -- Organ Pipe Cactus National Monument, AZ red & pink AZ-SRN
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Big Bend pricklypear (Opuntia aggeria) -- in April -- River Road East, Big Bend National Park, TX yellow & orange TX-BB
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Big Bend purplish pricklypear (Opuntia azurea var. parva) -- in April -- Big Bend National Park, TX yellow & orange TX-BB
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beavertail pricklypear (Opuntia basilaris) -- in March -- Palo Verde, CA red & pink CA-S
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beavertail pricklypear (Opuntia basilaris) -- in March -- Death Valley National Park, CA CA-DVNP
teddy-bear cholla (Opuntia bigelovii) -- in January -- Joshua Tree National Park, CA green & brown CA-S
teddy-bear cholla (Opuntia bigelovii) -- in March -- Cabeza Prieta National Wildlife Refuge, southern Arizona
Big Bend devil cholla (Opuntia densispina) -- in April -- River Road East, Big Bend National Park, Texas yellow & orange TX-BB
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sweet prickly pear (Opuntia dulcis) -- in April -- River Road East, Big Bend National Park, Texas yellow & orange TX-BB
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cactus apple (Opuntia engelmannii var. engelmannii) -- in April -- Big Bend Ranch State Park, TX yellow & orange TX-BBR
Christmas cholla (Opuntia leptocaulis) -- in April -- Big Bend Ranch State Park, TX yellow & orange TX-BBR
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bigroot pricklypear (Opuntia macrorhiza) -- in June -- Bellvue, CO (near the entrance to Lory State Park) yellow & orange
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bigroot pricklypear (Opuntia macrorhiza) -- in July -- Orchard Cove Trail, Lory State Park, Co yellow & orange CO-LSP
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bigroot pricklypear (Opuntia macrorhiza) -- in July -- National Center for Atmospheric Research, Boulder, CO
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plains pricklypear (Opuntia polyacantha) -- in June -- Cherokee Park State Wildlife Area, CO yellow & orange CHER
plains pricklypear (Opuntia polyacantha) -- in June -- Pawnee National Grassland, CO red & pink CO-G
starvation pricklypear (Opuntia polyacantha var. polyacantha) -- in May -- Overlook Trail, Lory State Park, CO yellow & orange OT-LSP
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starvation pricklypear (Opuntia polyacantha var. polyacantha) -- in June, Wray, Yuma County, CO
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blind pricklypear (Opuntia rufida) -- in April -- Big Bend National Park, Texas yellow & orange TX-BB
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spiny-fruited pricklypear (Opuntia spinosibacca) -- in April -- Big Bend National Park, TX red & pink TX-BB
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mountain ball cactus (Pediocactus simpsonii) -- in May -- Lory State Park, CO red & pink CO-LSP
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mountain ball cactus (Pediocactus simpsonii) -- in May -- Sand Creek National Landmark WY-SC
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organ pipe cactus (Stenocereus thurberi) -- in March -- Organ Pipe Cactus National Monument, AZ white & cream AZ-SRN
