A: Isoetaceae : Isoetes lacustre B-C: Isoetaceae : Isoetes duriei
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A. Engler and K. Prantl. 1902. Die naturlichen Pflanzenfamilien, I. vol 4. Fig. 455
Copyright 2005 by L.H. Bailey Hortorium (image, not necessarily source) [ref. DOL15373]
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