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Potamogeton filiformis (36-37); Potamogeton peclinatus (38-40). 36, habit sketch; 37, detail of tuberous rootstock; 38, young plant developing from tuber; 39, series of tubers; 40, tubers, showing details of early growth
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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)
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Potamogeton pectinatus, gigantic form of Dudley, portion of leafy spray showing tubers. November.
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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
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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
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Potamogeton pectinatus, cross section through stem, showing numerous air spaces.
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Potamogeton pectinatus. 50, Gigantic form of Dudley; 51, Gigantic form of Dudley; 52, gigantic form of Dudley; 53, gigantic form of Dudley
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Potamogeton pectinatus, gigantic form of Dudley, erect axis of plant, 5 feet 2 inches tall, bearing runner at base of stem. November.
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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
