J. S. Conn, E. K. Snyder-Conn, The Relationship of the Rock Outcrop Microhabitat to Germination, Water Relations, and Phenology of Erythrina flabelliformis (Fabaceae) in Southern Arizona, The Southwestern Naturalist, Vol. 25, No. 4 (Feb. 16, 1981), pp. 443-451
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Conn et al. (1981) studied this question.
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