Saunders, R.M.K.; Fowler, K. 1993: The supraspecific taxonomy and evolution of the fern genus Azolla (Azollaceae). Plant Systematics and Evolution 184: 175–193.

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Saunders, R.M.K.; Fowler, K. 1993: The supraspecific taxonomy and evolution of the fern genus Azolla (Azollaceae). Plant Systematics and Evolution 184: 175–193.