Alan Cressler:
Acanthocereus tetragonus, Snake Bight Trail, Cape Sable, Everglades National Park, Monroe County, Florida 1
Alan Cressler:
Agave Xglomeruliflora, Cattail Canyon, Chisos Mountains, Big Bend National Park, Brewster County, Texas 1
Alan Cressler:
Agave Xglomeruliflora, Cattail Canyon, Chisos Mountains, Big Bend National Park, Brewster County, Texas 4
Alan Cressler:
Agave decipiens, Turner River Shell Middens, Turner River, Everglades National Park, Collier County, Florida 2
Alan Cressler:
Agave palmeri, Sarah Deming Canyon, Chiricahua Mountains, Chiricahua National Monument, Cochise County, Arizona 1
Alan Cressler:
Agave parryi, Heart of Rocks, Chiricahua Mountains, Chiricahua National Monument, Cochise County, Arizona 1
Alan Cressler:
Agave scabra (Agave asperrima), Amistad National Recreation Area, Val Verde County, Texas 1
Alan Cressler:
Ariocarpus fissuratus, Terlingua Sinkhole, Brewster County, Texas 4
Alan Cressler:
Carnegiea gigantea (Crested), Sonoran Desert, Ironwood Forest National Monument, Pima County, Arizona 1
Alan Cressler:
Carnegiea gigantea (Crested), Sonoran Desert, Ironwood Forest National Monument, Pima County, Arizona 2
Alan Cressler:
Carnegiea gigantea (crested), Martinez Hill, Pima County, Arizona 1
Alan Cressler:
Carnegiea gigantea (crested), Paige Creek Canyon, Cochise County, Arizona 1
Alan Cressler:
Carnegiea gigantea (normal left and crested right), Martinez Hill, Pima County, Arizona 1
Alan Cressler:
Carnegiea gigantea, Diablo Mountains, Organ Pipe Cactus National Monument, Pima County, Arizona 1
Alan Cressler:
Carnegiea gigantea, King Canyon, Saguaro National Park, Tucson Mountains Section, Pima County, Arizona 1
Alan Cressler:
Carnegiea gigantea, Saguaro National Park (east), Pima County, Arizona 1
Alan Cressler:
Carnegiea gigantea, Saguaro National Park (east), Pima County, Arizona 1
Alan Cressler:
Carnegiea gigantea, Saguaro National Park, Pima County, Arizona 1
Alan Cressler:
Carnegiea gigantea, Saguaro National Park, Pima County, Arizona 2
Alan Cressler:
Carnegiea gigantea, Senita Basin, Organ Pipe Cactus National Monument, Pima County, Arizona 1
Alan Cressler:
Cephalocereus royenii, Bosque Estatal de Quanica, Municipio de Guayanilla, Puerto Rico 1
Alan Cressler:
Chihuahuan Desert, and Chisos Mountains, Ernst Wash, Big Bend National Park, Brewster County, Texas 1
Alan Cressler:
Corynopuntia aggeria, Indian Head, Big Bend National Park, Brewster County, Texas 1
Alan Cressler:
Corynopuntia aggeria, Indian Head, Big Bend National Park, Brewster County, Texas 2
Alan Cressler:
Corynopuntia aggeria, Indian Head, Big Bend National Park, Brewster County, Texas 3
Alan Cressler:
Corynopuntia schottii, Chihuahuan Desert, Chimneys Trail, Big Bend National Park, Brewster County, Texas 1
Alan Cressler:
Cylindropuntia acanthocarpa, Kuakatch Wash, Organ Pipe Cactus National Monument, Pima County, Arizona 1
Alan Cressler:
Cylindropuntia acanthocarpa, Saguaro National Park, Tuscon Mountains District, Red Hills Area, Pima County, Arizona 1
Alan Cressler:
Cylindropuntia acanthocarpa, Saguaro National Park, Tuscon Mountains District, Red Hills Area, Pima County, Arizona 2
Alan Cressler:
Cylindropuntia bigelovii, Senita Basin, Organ Pipe Cactus National Monument, Pima County, Arizona 2
