J. A.  Doyle, Bygrave, P. C., and Le Thomas, A., ?Implications of molecular data for pollen evolution in Annonaceae?, in Pollen & Spores: Morphology and Biology, M. M.  Harley, Morton, C. M., and Blackmore, S., Eds. Kew: Royal Botanic Gardens, 2000, pp. 259-284.

J. A.  Doyle, Bygrave, P. C., and Le Thomas, A., ?Implications of molecular data for pollen evolution in Annonaceae?, in Pollen & Spores: Morphology and Biology, M. M.  Harley, Morton, C. M., and Blackmore, S., Eds. Kew: Royal Botanic Gardens, 2000, pp. 259-284.