For Proboscidea
Bretting, P.K., and S. Nilsson. 1988. Pollen morphology of the Martyniaceae and its systematic implications. Syst. Bot. 13: 51-59. Google Scholar
Thieret, J.W. 1977. The Martyniaceae in the southeastern United States. J. Arnold Arb. 58: 25-39. Google Scholar