Potamogeton crispus L. (Afghanistan; Albania; Algeria; Altay; Argentina Northeast; Assam; Austria; Baleares; Baltic States; Bangladesh; Belarus; Belgium; Botswana; Bulgaria; Buryatiya; Cape Provinces; Central European Rus; Chita; Corse; Costa Rica; Cuba; Czechoslovakia; Denmark; East European Russia; East Himalaya; Egypt; Ethiopia; Fiji; Finland; France; Free State; Germany; Great Britain; Greece; Hungary; Illinois; India; Iran; Iraq; Italy; Japan; Kazakhstan; Kirgizstan; Korea; Krasnoyarsk; Krym; KwaZulu-Natal; Laos; Lebanon-Syria; Libya; Malawi; Mexico Central; Mexico Southwest; Mongolia; Mozambique; Myanmar; Nansei-shoto; Nepal; Netherlands; New Mexico; New Zealand North; New Zealand South; North Caucasus; Northern Provinces; Northwest European R; Norway; Pakistan; Palestine; Poland; Portugal; Romania; Sardegna; Sicilia; Sinai; South European Russi; Spain; Sudan; Sumatera; Swaziland; Sweden; Switzerland; Tadzhikistan; Tennessee; Transcaucasus; Turkey; Turkmenistan; Tuva; Ukraine; Uzbekistan; Vietnam; West Himalaya; West Siberia; Yugoslavia; Zambia; Zimbabwe as per Catalogue of Life)
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Potamogeton lucens L. (Afghanistan; Albania; Algeria; Altay; Amur; Assam; Austria; Azores; Baleares; Baltic States; Belarus; Belgium; Bulgaria; Buryatiya; Central European Rus; Chad; Chita; Corse; Czechoslovakia; Denmark; East European Russia; Egypt; Eritrea; Ethiopia; Finland; France; Germany; Great Britain; Greece; Gulf States; Hungary; India; Iran; Iraq; Ireland; Irkutsk; Italy; Japan; Kazakhstan; Kirgizstan; Krasnoyarsk; Kriti; Krym; Lebanon-Syria; Libya; Madagascar; Marianas; Mongolia; Morocco; Myanmar; Nepal; Netherlands; North Caucasus; North European Russi; Northwest European R; Norway; Pakistan; Palestine; Philippines; Poland; Portugal; Sardegna; Sicilia; Somalia; South European Russi; Spain; Sudan; Sweden; Switzerland; Tadzhikistan; Transcaucasus; Tunisia; Turkey; Turkmenistan; Tuva; Uganda; Ukraine; Uzbekistan; West Himalaya; West Siberia; Yakutskiya; Yugoslavia as per Catalogue of Life)
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Potamogeton natans L. ? (Temp. & Subtropical Northern Hemisphere: Afghanistan, Alaska, Albania, Alberta, Algeria, Altay, Amur, Austria, Baltic States, Belarus, Belgium, Bulgaria, Buryatiya, Central European Rus, Chita, Colorado, Corse, Czechoslovakia, Denmark, East Aegean Is., East European Russia, Finland, France, Føroyar, Germany, Great Britain, Greece, Hungary, Iceland, Illinois, Iran, Ireland, Irkutsk, Italy, Japan, Kamchatka, Kazakhstan, Kirgizstan, Korea, Krasnoyarsk, Krym, Kuril Is., Lebanon-Syria, Libya, Magadan, Mexico Central, Mexico Northwest, Mexico Southwest, Mongolia, Morocco, Myanmar, Nepal, Netherlands, New Mexico, New York, North Caucasus, North European Russi, Northwest European R, Norway, Pakistan, Poland, Portugal, Primorye, Romania, Sakhalin, Sardegna, Sicilia, South European Russi, Spain, Sweden, Switzerland, Tadzhikistan, Transcaucasus, Tunisia, Turkey, Tuva, Ukraine, Uzbekistan, Vermont, West Himalaya, West Siberia, Yakutskiya, Yemen, Yugoslavia, Yukon as per POWO)

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Potamogeton nodosus Poir. (Afghanistan; Albania; Algeria; Amur; Andaman Is.; Angola; Assam; Austria; Azores; Bahamas; Baleares; Baltic States; Bangladesh; Belarus; Belgium; Botswana; Brazil North; British Columbia; Bulgaria; Canary Is.; Cape Provinces; Caprivi Strip; Central European Rus; Chad; China South-Central; Chita; Comoros; Corse; Cuba; Cyprus; Czechoslovakia; Dominican Republic; East Aegean Is.; East European Russia; East Himalaya; Egypt; Ethiopia; France; Germany; Great Britain; Greece; Guatemala; Gulf States; Gulf of Guinea Is.; Haiti; Hawaii; Hungary; Illinois; India; Iran; Iraq; Italy; Jamaica; Jawa; Kazakhstan; Kriti; Krym; KwaZulu-Natal; Lebanon-Syria; Leeward Is.; Lesotho; Lesser Sunda Is.; Libya; Madagascar; Madeira; Marianas; Marion-Prince Edward; Mauritania; Mauritius; Mexican Pacific Is.; Mexico Central; Mexico Gulf; Mexico Northeast; Mexico Northwest; Mexico Southeast; Mexico Southwest; Morocco; Myanmar; Namibia; Nepal; Netherlands; New Caledonia; New Guinea; New Mexico; Niger; North Caucasus; North European Russi; Northern Provinces; Northern Territory; Oman; Pakistan; Palestine; Panam; Philippines; Poland; Portugal; Puerto Rico; Romania; Runion; Saudi Arabia; Senegal; Seychelles; Sicilia; Sinai; Socotra; South European Russi; Spain; Sri Lanka; Sudan; Sulawesi; Sumatera; Switzerland; Tadzhikistan; Taiwan; Tanzania; Tennessee; Thailand; Transcaucasus; Trinidad-Tobago; Tunisia; Turkey; Turkey-in-Europe; Turkmenistan; Ukraine; Uzbekistan; Vanuatu; Venezuela; Vietnam; West Himalaya; Western Australia; Windward Is.; Yemen; Yugoslavia; Zambia; Zimbabwe as per Catalogue of life)
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As per efi thread :

Aponogeton: perianth 1-3, white membranous, stamens 6 or more
Potamogeton: perianth 4, green, herbaceous, stamens 4, opposite

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Species with description & keysfrom Flora of Pakistan (Distribution):

Potamogeton alpinus Balbis (Temperate and arctic regions of Asia, Europe and N. America)

Potamogeton crispus Linn. (Europe, Asia, Africa and Australia)

Potamogeton filiformis Pers. (Temperate and arctic regions of Europe, Asia and N. America)- syn. of Stuckenia filiformis (Pers.) Börner

Potamogeton gramineus Linn. (Temperate and arctic regions of Europe, Asia and N. America)

Potamogeton lucens Linn. (Europe, N. Africa and temperate Asia)

Potamogeton natans Linn. (Temperate and arctic regions of Europe, Asia and N. America)

Potamogeton nodosus Poiret in Lam. (Warmer regions of Europe, N. and Cent. America, Africa and Asia)

Potamogeton octandrus Poir. in Lam. (widely distributed in tropical and N.E. South Africa, Madagascar, S.E. Asia and N.E. Australia)

Potamogeton pectinatus Linn. (A cosmopolitan species, common throughout the hills and plains of Pakistan)- syn. of Stuckenia pectinata (L.) Börner

Potamogeton perfoliatus Linn. (Europe, Asia, Africa, N. America and Australia)

Potamogeton pusillus Linn. (Europe, temperate Asia, Africa and N. America)


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Species with distribution in annotated checklist of Flowering plants of Nepal (Distribution):

Potamogeton crispus L. (600-2000 m; Europe, Africa, Asia and Australia)

Potamogeton filiformis Pers. (2000-4700 m; Temperate and arctic N. Hemisphere)- syn. of Stuckenia filiformis (Pers.) Börner

Potamogeton lucens L. (2950 m; Europe, N. Africa, Temperate Asia)

Potamogeton natans L. (3500-4400 m; Temperate and arctic N. Hemisphere)

Potamogeton nodosus Poir. (600-3000 m; Warm temperate and tropical regions of Europe, Africa, Asia and America)

Potamogeton octandrus Poir. (700-1000 m; Tropical Africa, Asia and Australia)

Potamogeton pectinatus L. (3000 m; Temperate and tropical regions of Europe, Africa, Asia, America and Australia)- syn. of Stuckenia pectinata (L.) Börner

Potamogeton pusillus L. (2100-3000 m; Europe, Afriea, temperate Asia, N. America


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Some species found in Indian Subcontinent with description & keys from Flora of China [Distribution other than China]:

Potamogeton alpinus Balbis [Afghanistan, India (Assam), Japan, Kazakhstan, Korea, Myanmar, Pakistan, Russia, Uzbekistan; Europe, North America].

Potamogeton berchtoldii Fieber in Berchtold & Opiz [Bhutan, Japan, Korea, Russia; SW Asia, Europe, North America].

Potamogeton crispus Linnaeus [Afghanistan, Bangladesh, Bhutan, India, Indonesia (Sumatra), Japan, Kazakhstan, Korea, Kyrgyzstan, Laos, Mongolia, Myanmar, Nepal, Pakistan, Russia, Tajikistan, Thailand, Turkmenistan, Uzbekistan, Vietnam; Africa, SW Asia, Australia, Europe; introduced in North and South America and Pacific islands (New Zealand)].

Potamogeton distinctus A. Bennett [Bhutan, Indonesia, Japan (including Ryukyu Islands), Korea, Malaysia, Nepal, Philippines, Russia, Thailand, Vietnam; Pacific islands].

Potamogeton gramineus Linnaeus [Japan, Kazakhstan, Korea, Mongolia, Pakistan, Russia, Turkmenistan, Uzbekistan; SW Asia (Iran), Europe, North America].

Potamogeton lucens Linnaeus [Afghanistan, India, Kazakhstan, Kyrgyzstan, Myanmar, Nepal, Pakistan, Philippines, Russia, Tajikistan, Turkmenistan, Uzbekistan; N Africa, SW Asia, Europe]. 

Potamogeton natans Linnaeus [Afghanistan, Japan, Kazakhstan, Korea, Kyrgyzstan, Mongolia, Myanmar, Nepal, Russia, Tajikistan, Uzbekistan; temperate and boreal regions of Africa, SW Asia, Europe, and North America].

Potamogeton nodosus Poiret in Lamarck [Bangladesh, India, Indonesia, Japan, Kazakhstan, Myanmar, Nepal, New Guinea, Pakistan, Russia, Sri Lanka, Tajikistan, Thailand, Turkmenistan, Uzbekistan, Vietnam; Africa, SW Asia, Europe, North and South America, Pacific islands].

Potamogeton octandrus Poiret in Lamarck [Bangladesh, India, Indonesia (Java), Japan (including Ryukyu Islands), Korea, Malaysia, Myanmar, Nepal, New Guinea, Russia, Thailand, Vietnam; Africa, Australia].

Potamogeton perfoliatus Linnaeus [Afghanistan, India, Indonesia (Sumatra), Japan, Kazakhstan, Korea, Kyrgyzstan, Mongolia, Pakistan, Russia, Tajikistan, Uzbekistan; Africa, SW Asia, Australia, Central and North America, Europe].

Potamogeton pusillus Linnaeus [Afghanistan, India, Japan (including Ryukyu Islands), Kazakhstan, Korea, Kyrgyzstan, Myanmar, Nepal, New Guinea, Pakistan, Philippines, Russia, Tajikistan, Turkmenistan, Uzbekistan; Africa, SW Asia, Europe, North America].

Potamogeton wrightii Morong [India, Indonesia, Japan, Kazakhstan, Korea, Laos, Malaysia, Myanmar, New Guinea, Pakistan, Philippines, Russia, Thailand, Vietnam; Pacific islands].


 

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