1. Axsmith BJ, Taylor TN, Taylor EL (1998) The limitation of molecular systematics: a palaeobotanical perspective. Taxon 47:105–108
2. Brenner GJ (1976) Middle Cretaceous floral province and early migrations of angiosperms. In: Beck CB (ed) Origin and early evolution of angiosperms. Columbia University Press, New York, pp 23–47
3. Cornet B (1986) The leaf venation and reproductive structures of a late Triassic angiosperm, Sanmiguelia lewisii. Evol Theory 7:231–308
4. Cornet B (1989a) Late Triassic angiosperm-like pollen from the Richmond rift basin of Virginia, USA. Paläontographica B 213:37–87
5. Cornet B (1989b) The reproductive morphology and biology of Sanmiguelia lewisii, and its bearing on angiosperm evolution in the late Triassic. Evol Trends Plants 3:25–51