Fennel Leaved Pondweed

plant drying after being out of water for 1/2 hour

Filsø, Mellemsø, Henne, SV-Jylland, Danmark

Filsø, Mellemsø, Henne, SV-Jylland, Danmark

Filsø, Mellemsø, Henne, SV-Jylland, Danmark

Filsø, Mellemsø, Henne, SV-Jylland, Danmark

Filsø, Mellemsø, Henne, SV-Jylland, Danmark

Gudenåen ved Brestenbro, Jylland

Hærup Sø, Klejtrup, Jylland, Danmark

Hærup Sø, Klejtrup, Jylland, Danmark

Fennel-leaved pondweed (Potamogeton pectinatus). Found in fresh, brackish, or salt water, Cape Breton to British Columbia, south to Florida, Texas, and California. Also in Europe (After Britton & Brown)

Potamogeton pectinatus, gigantic form of Dudley, portion of leafy spray showing tubers. November.

Potamogeton pectinatus. 45, plant developed in aquarium, suspended in water; 46, sprouting seed; 47, same, later stage; 48, seedling about 10 days old, outer testa of seed removed; 49, seedling three weeks old

Potamogeton pectinatus. 54, gigantic form of Dudley; 55, gigantic form of Dudley; 56, spray, showing cases of chironomids; 57, characteristic vegetative structure, rooting at nodes, May

Potamogeton pectinatus, cross section through stem, showing numerous air spaces.

Potamogeton pectinatus. 50, Gigantic form of Dudley; 51, Gigantic form of Dudley; 52, gigantic form of Dudley; 53, gigantic form of Dudley

Potamogeton pectinatus, gigantic form of Dudley, erect axis of plant, 5 feet 2 inches tall, bearing runner at base of stem. November.

Potamogeton pectinatus. 41, Tubers of two successive seasons; 42, terminal portion of subterranean stem; 43, mature portion of rootstock; 44, spray showing fruiting spike and tuberous runners