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Year
Total: 3
infragenus
valid
Azolla
Section
Filifera
J.W. Hall
Amer. Fern J., 58(2):
79.
24 Jun 1968
infragenus
valid
Azolla
Section
Kremastospora
R.K. Jain, J.W. Hall
Amer. J. Bot., 56(5):
538.
29 May 1969
infragenus
valid
Azolla
Section
Simplicispora
J.W. Hall
Taxon, 19(2):
303.
29 Apr 1970
