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A. J. Hemsley, I. K. Ferguson, Pollen Morphology of the Genus Erythrina (Leguminosae: Papilionoideae) in Relation to Floral Structure and Pollinators, Annals of the Missouri Botanical Garden, Vol. 72, No. 3 (1985), pp. 570-590
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Hemsley et al. (1985) studied this question.
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