Fuad M. Safwat, The Floral Morphology of Secamone and the Evolution of the Pollinating Apparatus in Asclepiadaceae, Annals of the Missouri Botanical Garden, Vol. 49, No. 1/2 (Feb. - May, 1962), pp. 95-129
No takes yet. Share an insight, caveat, or question.
Fuad M. Safwat (1962) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: