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- Potamogeton pusillus subsp. tenuissimus (category Potamogeton pusillus)berchtoldii Fieber Potamogeton berchtoldii var. colpophilus (Fernald) Fernald Potamogeton berchtoldii var. lacunatus (Hagström) Fernald Potamogeton berchtoldii var.4 KB (358 words) - 20:31, 5 November 2020