The potamogetons (pond weeds) of the British Isles,
with descriptions of all the species, varieties and hybrids /
by Alfred Fryer, A. L. S., and Arthur Bennett, A. L. S. (The Lucens group ed. from Mr. Fryer's manuscript notes by A. H. Evans, F. Z. S.) Illustrated by Robert Morgan, F. L. S., and others.

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