Aslan C. E., Pollination of the Endangered Arizona Hedgehog Cactus (Echinocereus arizonicus), The American Midland Naturalist, 2015, 173(1):61-72, doi: 10.1674/0003-0031-173.1.61
A comparison of flower visitation at five wild sites and at Boyce Thompson Arboretum. Experiments involving flower isolation, bird exclusion and pollen supplementation assess the contributions of insects and hummingbirds to seed production in the studied Echinocereus arizonicus material.