Pondweeds

O Opposite-leaved pondweed Groenlandia densa P Pondweed Potamogeton S Sharp-leaved pondweed Potamogeton acutifolius R Red pondweed Potamogeton alpinus L Large-leaved pondweed Potamogeton amplifolius B Berchtold's pondweed Potamogeton berchtoldii F Fen pondweed Potamogeton coloratus G Grass-wrack pondweed Potamogeton compressus C Curly-leaf pondweed Potamogeton crispus D Distinct pondweed Potamogeton distinctus D Diverse-leaved pondweed Potamogeton diversifolius R Ribbon-leaf pondweed Potamogeton epihydrus L Leafy pondweed Potamogeton foliosus F Fries's pondweed Potamogeton friesii V Various-leaved pondweed Potamogeton gramineus I Illinois pondweed Potamogeton illinoensis S Shining pondweed Potamogeton lucens M Maack's pondweed Potamogeton maackianus F Floating pondweed Potamogeton natans L Longleaf pondweed Potamogeton nodosus B Blunt-leaved pondweed Potamogeton obtusifolius E Eight-stamen pondweed Potamogeton octandrus P Perfoliate pondweed Potamogeton perfoliatus B Bog pondweed Potamogeton polygonifolius L Long-stalked pondweed Potamogeton praelongus L Lesser pondweed Potamogeton pusillus R Richardson's pondweed Potamogeton richardsonii R Robbins' pondweed Potamogeton robbinsii R Reddish pondweed Potamogeton rutilus S Schweinfurth's pondweed Potamogeton schweinfurthii S Straight-leaf pondweed Potamogeton strictifolius T Thunberg's pondweed Potamogeton thunbergii T Tricarinate pondweed Potamogeton tricarinatus H Hairlike pondweed Potamogeton trichoides F Flatstem pondweed Potamogeton zosteriformis S Slender-leaved pondweed Stuckenia filiformis S Sago pondweed Stuckenia pectinata S Sheathed pondweed Stuckenia vaginata H Horned pondweed Zannichellia palustris