Cactus family (Cactaceae)

Carnegiea

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

cylindropuntia

Wiggins' cholla (Cylindropuntia echinocarpa) -- in March -- U.S. 95 in southern Nevada   red & pink ​  

Wiggins' cholla (Cylindropuntia echinocarpa) -- in March -- Cabeza Prieta National Wildlife Refuge, southern Arizona​

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

jumping cholla (Cylindropuntia fulgida) -- in March -- Organ Pipe Cactus National Monument, AZ

tree cholla (Cylindropuntia imbricata) -- in March -- near Walsenberg, Colorado grasslands     red & pink        

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

walkingstick cactus (Cylindropuntia spinosior) -- in April --  Villanueva State Park, NM   red & pink   

whipple cactus (Cylindropuntia whipplei) -- in March -- Four Corners, northern New Mexico       green & brown      

echinocactus

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

echinocereus

Texas claret-cup cactus (Echinocereus coccineus var. paucispinus) -- 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   

​spiny hedgehog cactus (Echinocereus dasyacanthus) -- in April -- Big Bend Ranch State Park, TX   red & pink ​  

Englemann's hedgehog cactus (Echinocereus englemannii) -- in March -- Organ Pipe Cactus National Monument, AZ  red & pink ​ 

pitaya (Echinocereus enneacanthus) -- in April -- Big Bend National Park, Texas   red & pink    

​Mojave kingcup cactus (Echinocereus mojavensis) -- in May -- Canyons of the Ancients National Monument, CO   ​red & pink

​Mojave kingcup cactus (Echinocereus mojavensis) -- in May -- Yampa Bench Road, Dinosaur National Monument, CO    red & pink ​

strawberry cactus (Echinocereus stramineus var. stramineus) -- in April -- Big Bend Ranch State Park, TX   red & pink ​  

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

hen-and-chickens (Echinocereus viridiflorus) -- in May -- Pawnee National Grassland, CO

nylon hedgehog cactus (Echinocereus viridiflorus var. chloranthus) -- in April -- Chihuahuan Desert Nature Center, TX   green & brown ​   

Correll's hedgehog (Echinocereus viridiflorus var. correllii) -- in April -- Chihuahuan Desert Nature Center, TX      green & brown ​   

small-flowered hedgehog (Echinocereus viridiflorus var. cylindricus) -- in April -- Chihuahuan Desert Nature Center     green & brown ​   

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   

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

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

ferocactus

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   

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

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

glandulicactus

 Wright's fishhook cactus (Glandulicactus wrightii) -- in April -- Chihuahuan Desert Nature Center, TX    red & pink   

grusonia

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

Mammillaria

little nipple cactus (Mammillaria meiacantha) -- in April -- Chihuahuan Desert Nature Center, TX     green & brown  

corkseed cactus (Mammillaria tetrancistra) -- in April -- Palm Canyon, Kofa National Wildlife Refuge, AZ  red & pink   

neolloydia

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

opuntia

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

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

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

purple pricklypear (Opuntia azurea) -- in April -- Big Bend National Park, Texas     yellow & orange  ​

beavertail pricklypear (Opuntia basilaris) -- in March -- Palo Verde, southern California        red & pink    

beavertail pricklypear (Opuntia basilaris) -- in March -- Death Valley National Park, CA   

teddy-bear cholla (Opuntia bigelovii) -- in January -- Joshua Tree National Park, CA              green & brown ​    

Big Bend devil cholla (Opuntia densispina) -- in April -- River Road East, Big Bend National Park, Texas  yellow & orange 

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

Christmas cholla (Opuntia leptocaulis) -- in April -- Big Bend Ranch State Park, TX   yellow & orange  

​bigroot pricklypear (Opuntia macrorhiza) -- in June -- Horsetooth Reservoir, Larimer County Open Space, CO

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

​bigroot pricklypear (Opuntia macrorhiza) -- in November -- Gateway Natural Area, Fort Collins, Larimer County, CO

                                                                                                                                      glochids at 20 x magnification

​bigroot pricklypear (Opuntia macrorhiza) -- in December -- Bellvue, Larimer County Foothills, CO

​tulip pricklypear (Opuntia phaeacantha) -- in May -- Canyons of the Ancients National Monument, CO     ​yellow & orange

tulip pricklypear (Opuntia phaeacantha) -- in April -- Big Bend Ranch State Park, TX    yellow & orange

​plains pricklypear (Opuntia polyacantha) -- in June -- Hall Ranch Open Space, Boulder County, CO

​plains pricklypear (Opuntia polyacantha) -- in July -- Young Gulch, Poudre Canyon, Larimer County, CO

plains pricklypear (Opuntia polyacantha) -- in June -- Cherokee Park State Wildlife Area, CO   yellow & orange 

plains pricklypear (Opuntia polyacantha) -- in June -- Pawnee National Grassland, CO      red & pink ​    

starvation pricklypear (Opuntia polyacantha var. polyacantha) -- in May -- Overlook Trail, Lory State Park, CO    yellow & orange  

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

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

pediocactus

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

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

Stenocereus

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