Azolla mexicana
- Citations total:
- 4
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| details | Recent | Canada(British Columbia) | Hills,L.V. et al. Azolla primaeva and its phylogenetic significance. | 1967 | |
| details | Nd | Minnesota | Hall,J.W. Cretaceous Salviniaceae. | 1974 | |
| details | Maastrichtian | North Dakota | Bergad,R.D. Palynology of the Hell Creek Formation (Maastrichtian) in South-Central North Dakota. | 1974 | |
| details | Early Miocene | Czechoslovakia(Bohemia) | Buzek,C. et al. Azolla remains from the Lower Miocene of the North-Bohemian Bas Czechoslovakia | 1988 |