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Stenarmen ved Mariager, Danmark
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Potamogeton americanus. 1, seed; 2, seedling 5 days old; 3, seedling 14 days old; 4, seedling of four months; A, winter buds; 5, germinating winter bud, natural size; the last two winter buds belated in development. Aquarium specimen, January 24, 1914; 6, rootstock with winter bud A, natural size. September
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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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Potamogeton Robbinsii, branch, showing points where dismemberment occurs.
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Potamogeton heterophyllus.
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Potamogeton amplifolius (7) rootstock; Potamogeton heterophyllus (8); Potamogeton heterophyllus (9-12). 7, rootstock; 8, submerged plant; 9, rootstock not tuberous; 10, tuberous rootstock; 11, tuberous rootstock
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Subbæk Vandmølle ved Viborg, Danmark
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Soldaterskov ved Tønder, Danmark
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Harboslette, Hjardemål Klit, Thy, Danmark
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Stenarmen ved Mariager, Danmark
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Long-leaved pondweed (Potamogeton lonchites). Found in ponds and slow streams, New Brunswick to Washington, south to Florida and California (After Britton & Brown)
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Curled-leaved Pondweed (Potamogeton crispus). Found in fresh, brackish or even salt water, Massachusetts to Pennsylvania and Virginia. Also in Europe (After Britton & Brown)
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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 amplifolius, rooted tip of branch, a propagative structure.
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Subbæk Vandmølle ved Viborg, Danmark
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Soldaterskov ved Tønder, Danmark
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Harboslette, Hjardemål Klit, Thy, Danmark
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Stenarmen ved Mariager, Danmark
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Potamogeton crispus, germinating burs. October.
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Potamogeton pectinatus, gigantic form of Dudley, portion of leafy spray showing tubers. November.
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Subbæk Vandmølle ved Viborg, Danmark
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Soldaterskov ved Tønder, Danmark
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Harboslette, Hjardemål Klit, Thy, Danmark
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Stenarmen ved Mariager, Danmark
