Potamogeton nodosus

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Potamogeton nodosus

Description

Fruits variable in shape and colour, 2.7-4.1 mm long, dorsally and ventrally keeled, sometimes carinate.

Distribution

Afghanistan present, Alor present, Andaman Islands present, Asia-Temperate: China South-Central (Yunnan present); Taiwan (Taiwan present), Asia-Tropical: India present; Lesser Sunda Is. present; New Guinea present; Pakistan (Pakistan present); Philippines (Philippines present); Sri Lanka (Sri Lanka present); Sulawesi (Sulawesi present); Sumatera (Sumatera present); Thailand (Thailand present); Vietnam (Vietnam present), Australasia: Northern Territory (Northern Territory present); Western Australia (Western Australia present), Burma present, C and S Asia present, Europe present, Flores present, Kashmir present, Luzon present, Madagascar present, Marianne Islands present, Mascarene Islands present, N and C America present, N and W Africa present, Nepal present, New Caledonia present, New Hebrides present, Pacific area present, Timor present, W Siberia present, northern hemisphere and the tropics present
Widely distributed in the northern hemisphere and the tropics, occurring in N and C America, Europe, N and W Africa, Madagascar, the Mascarene Islands, W Siberia, C and S Asia: Pakistan, Afghanistan, Kashmir, Nepal, India, Sri Lanka, Burma, Thailand, Andaman Islands, China (Yunnan), Taiwan, Vietnam, Pacific area (Marianne Islands, New Caledonia, New Hebrides); Australia (Western Australia, Northern Territory); in Malesia: Sumatra, Philippines (Luzon), Celebes, Lesser Sunda Islands (Alor, Flores, Timor?), New Guinea.

Taxonomy

The distinction between P. nodosus and P. distinctus is difficult, as it depends on various characters that show a wide overlap. Several P. nodosus-like plants cannot exactly be assigned to either of these species. The following specimens are examples for such forms. Alor: Jaag 1014 (ZT); Flores: Jaag 1619 (ZT); Timor: van Steenis 18113, plants with cordate leaf bases in floating leaves; New Guinea: Jermy 3940 (BM, K), plants with short petioled submersed leaves and abruptly long petioled floating leaves; Raynal 16697 (L) is the same form, but is lacking floating leaves.

Citation

Hook.f. 1894: Fl. Brit. India: 656
Graebn. 1907 – In: Engl., Pflanzenr. 31: 64
Mendoza & Del Rosario 1967: Philipp. Aquat. Flow. Pl. Ferns: 42
Hagstr. 1916 – In: Kungl. Svenska Vetenskapsakad. Handl.: 183