Alan Cressler:
Anisacanthus thurberi, Sycamore Canyon, Pajarita Wilderness, Coronado National Forest, Santa Cruz County, Arizona 1
Alan Cressler:
Aquilegia chrysantha, Hanging Garden, Sycamore Canyon, Pajarita Wilderness, Coronado National Forest, Santa Cruz County, Arizona 1
Alan Cressler:
Aquilegia chrysantha, Madera Canyon, Santa Rita Mountains, Coronado National Forest, Santa Cruz County, Arizona 1
Alan Cressler:
Aquilegia chrysantha, Madera Canyon, Santa Rita Mountains, Coronado National Forest, Santa Cruz County, Arizona 2
Alan Cressler:
Aquilegia chrysantha, Sycamore Canyon, Pajarita Wilderness, Coronado National Forest, Santa Cruz County, Arizona 1
Alan Cressler:
Argemone polyanthemos, Calabaas Canyon, Coronado National Forest, Santa Cruz County, Arizona 1
Alan Cressler:
Argemone polyanthemos, Calabaas Canyon, Coronado National Forest, Santa Cruz County, Arizona 2
Alan Cressler:
Asclepias angustifolia, Sycamore Canyon, Pajarita Wilderness, Coronado National Forest, Santa Cruz County, Arizona 1
Alan Cressler:
Asclepias angustifolia, Sycamore Canyon, Pajarita Wilderness, Coronado National Forest, Santa Cruz County, Arizona 2
Alan Cressler:
Asclepias asperula, Rain Valley, Cochise County, Arizona 1
Alan Cressler:
Asclepias asperula, Rain Valley, Cochise County, Arizona 2
Alan Cressler:
Asclepias linaria, Sycamore Canyon, Pajarita Wilderness, Coronado National Forest, Santa Cruz County, Arizona 1
Alan Cressler:
Asplenium palmeri, Sycamore Canyon, Pajarita Wilderness, Coronado National Forest, Santa Cruz County, Arizona 1
Alan Cressler:
Asterocampa clyton, Desert Ecology Trail, Saguaro National Park, Rincon Mountain District, Pima County, Arizona 1
Alan Cressler:
Battus philenor, Caterpillar, Millville Historic Townsite, San Pedro River Riparian National Conservation Area, Cochise County, Arizona 1
Alan Cressler:
Callisaurus draconoides subsp. ventralis, Honey Bee Canyon, Honey Bee Canyon Park, Oro Valley, Pima County, Arizona 1
Alan Cressler:
Calochortus ambiguus, Mustang Mountains, State Trust Lands, Santa Cruz County, Arizona 1
Alan Cressler:
Calochortus ambiguus, Mustang Mountains, State Trust Lands, Santa Cruz County, Arizona 2
Alan Cressler:
Carnegiea gigantea, Cactus Forest Loop, Saguaro National Park, Rincon Mountain District, Pima County, Arizona 1
Alan Cressler:
Carnegiea gigantea, Cactus Forest Loop, Saguaro National Park, Rincon Mountain District, Pima County, Arizona 2
Alan Cressler:
Carnegiea gigantea, Cactus Forest Loop, Saguaro National Park, Rincon Mountain District, Pima County, Arizona 3
Alan Cressler:
Carnegiea gigantea, Crested, Cactus Forest Loop, Saguaro National Park, Rincon Mountain District, Pima County, Arizona 1
Alan Cressler:
Carnegiea gigantea, Tucson Mountains, Tucson Mountain Park, Pima County, Arizona 1
Alan Cressler:
Carnegiea gigantea, Tucson Mountains, Tucson Mountain Park, Pima County, Arizona 2
Alan Cressler:
Carnegiea gigantea, Tucson Mountains, Tucson Mountain Park, Pima County, Arizona 3
Alan Cressler:
Carnegiea gigantea, Tucson Mountains, Tucson Mountain Park, Pima County, Arizona 4
Alan Cressler:
Carnegiea gigantea, Tucson Mountains, Tucson Mountain Park, Pima County, Arizona 5
Alan Cressler:
Carnegiea gigantea, Tucson Mountains, Tucson Mountain Park, Pima County, Arizona 6
Alan Cressler:
Carnegiea gigantea, Tucson Mountains, Tucson Mountain Park, Pima County, Arizona 7
Alan Cressler:
Carnegiea gigantea, Tucson Mountains, Tucson Mountain Park, Pima County, Arizona 8
