Tumbuhan zaman perm. Spesiesnya Peltaspermum martinsii

Bacaan lanjut
DiMichele, W.A., Kerp, H., Krings, M. & Chaney, D.H. (2005): The Permian Peltasperm radiation: evidence from the southwestern United States. - New Mexico Mus. Nat. Hist Sci. Bull., 30: 67-79.
Kerp, H., Broutin, J., Lausberg, S. & Aassoumi, H. (2001): Discovery of Latest Carboniferous-Early Permian radially symmetrical peltaspermaceous megasporophylls from Europe and North Africa. - C.R. Acad. Sci., Paris. Sér. II, 332: 513-519.
Naugolnykh, S. & Kerp, H. (1996): Aspects of Permian Palaeobotany and Palynology. XV. On the oldest known peltasperms with radially symmetrical ovuliferous discs from the Kungurian (uppermost Lower Permian) of the Fore-Urals (Russia). - Rev. Palaeobot. Palynol., 91: 35-62

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