Reference citation:
P. G. Howes, The Giant Cactus Forest and Its World: A Brief Biology of the Giant Cactus Forest of Our American Southwest (Duell, Sloan, and Pearce, New York

Reference URL:
1954), from pp. 222-239, from p. 227.

Source archive URL:
Semantic Prototypes in Research Ecoinformatics (SPIRE). Data provided by Joel Sachs. See also http://ebiquity.umbc.edu/get/a/publication/297.pdf .

Source DOI:
globalbioticinteractions/spire