Cactus (Cactaceae) family

Carnegiea

saguaro cactus (Carnegiea giganteus) -- in March -- Organ Pipe Cactus National Monument, AZ          white & cream       AZ-SRN

cylindropuntia

jumping cholla (Cylindropuntia fulgida) -- in March -- Sonoran Desert National Monument, AZ      green & brown ​    AZ-S

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

tree cholla (Cylindropuntia imbricata) -- in April -- Mills Canyon, Kiowa National Grassland, NM   red & pink ​   NM-N

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

echinocactus

cottontop cactus (Echinocactus polycephalus) -- in March -- Death Valley National Park, CA     yellow & orange 

echinocereus

scarlet hedgehog cactus (Echinocereus coccineus var. coccineus) -- in March -- San Xavier Mission, AZ     red & pink ​

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

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

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 ​

hen-and-chickens (Echinocereus viridiflorus) -- in June -- South Valley Loop Trail, Lory State Park, CO     green & brown       CO-LSP

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 ​ 

Escobaria

Hester's pincushion cactus (Escobaria hesteri) -- in April -- Chihuahuan Desert Nature Center, TX    red & pink   TX-W

nipple cactus (Escobaria missouriensis) -- in May -- Mill Creek Link Trail, Lory State Park, CO           green & brown     CO-LSP

silverlace cactus (Escobaria sneedii) -- in April -- Big Bend Ranch State Park, TX   red & pink   

spinystar (Escobaria vivipara) -- in June -- Mt. Margaret, Red Feather Lakes Area, CO       red & pink ​       CO-M  ​

ferocactus

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

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

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

fishhook barrel cactus (Ferocactus wislizenii) -- in April -- Chihuahuan Desert Nature Center, TX    yellow & orange  TX-W

glandulicactus

 eagle-claw cactus (Glandulicactus uncinatus) -- in April -- Chihuahuan Desert Nature Center, TX    red & pink    TX-W

grusonia

cholla organillo (Grusonia bradtiana) -- in April -- Big Bend Ranch State Park, TX    yellow & orange  TX-BBR

Mammillaria

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

neolloydia

Chihuahuan beehive (Neolloydia conoidea) -- in April -- Chihuahuan Desert Nature Center, TX    red & pink ​   TX-W

opuntia

buckhorn cholla (Opuntia acanthocarpa) -- in March -- Organ Pipe Cactus National Monument, AZ              red & pink   AZ-SRN

Big Bend pricklypear (Opuntia aggeria) -- in April -- River Road East, Big Bend National Park, TX    yellow & orange   TX-BB

Big Bend purplish pricklypear (Opuntia azurea var. parva) -- in April -- Big Bend National Park, TX     yellow & orange    TX-BB

beavertail pricklypear (Opuntia basilaris) -- in March -- Palo Verde, CA         red & pink    CA-S

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

sweet prickly pear (Opuntia dulcis) -- in April -- River Road East, Big Bend National Park, Texas    yellow & orange  TX-BB

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

bigroot pricklypear (Opuntia macrorhiza) -- in June -- Bellvue, CO (near the entrance to Lory State Park)  yellow & orange

bigroot pricklypear (Opuntia macrorhiza) -- in July -- Orchard Cove Trail, Lory State Park, Co         yellow & orange       CO-LSP

bigroot pricklypear (Opuntia macrorhiza) -- in July -- National Center for Atmospheric Research, Boulder, CO

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

starvation pricklypear (Opuntia polyacantha var. polyacantha) -- in June, Wray, Yuma County, CO

blind pricklypear (Opuntia rufida) -- in April -- Big Bend National Park, Texas      yellow & orange     TX-BB

spiny-fruited pricklypear (Opuntia spinosibacca) -- in April -- Big Bend National Park, TX    red & pink    TX-BB

pediocactus

mountain ball cactus (Pediocactus simpsonii) -- in May -- Lory State Park, CO          red & pink      CO-LSP

mountain ball cactus (Pediocactus simpsonii) -- in May -- Sand Creek National Landmark       WY-SC

Stenocereus

organ pipe cactus (Stenocereus thurberi) -- in March --  Organ Pipe Cactus National Monument, AZ           white & cream     AZ-SRN ​