VoK x POTAMOGETONACEAE 23 



Luzon (Benguet), Loher 1597. In shallow water, altitude about 1,400 

 m. Europe, Asia, and North America. 



POTAMOGETON M AACKI AN US A. Benn. in Journ. Bot. 42 (1904) 74, 

 Philip. Journ. iSci. 9 (1914) Bot. 342. 



Mindanao (Lanao), Clemens 216. In shallow water of Lake Lanao, 

 altitude about 650 m. Northern Asia, Korea, China, Japan, and Formosa. 



POTAMOGETON MALAINUS Miq. 111. Fl. Archlp. Ind. (1871) 46 (mala- 



ina); Aschers. & Graebn. in Engl. Pflanzenreich 31 (1907) 83; A. 



Benn. in Philip. Journ. Sci. 9 (1914) Bot. 341; Merr. Fl. Manila 



(1912) 67. 



Potamogeton mucronatus Presl Epim. (1851) 245; Walp. Ann. 3 



(1852-53) 504, non Schrad. 

 Potamogeton lucens Naves Novis. App. (1882) 297; Vidal Phan. 

 Cuming. Philip. (1885) 155, Rev. PI. Vase. Filip. (1886) 282, non 

 Linn. 

 Luzon (Rizal, Laguna, Sorsogon), Mindanao (Lanao), Merrill 5107, 

 Williams 2041, Elmer 18113, B. S. 22797 McGregor, 11892 Robinson & 

 Ramos. In shallow water of lakes at low and medium altitudes. India 

 to Korea and Japan southward to Borneo, Java, and Celebes. The Phil- 

 ippine form has been somewhat confused with Potamogeton gaudichaudii 

 C. & S. which is a form of P. lucens Linn. 

 Local name: Damung-kulut (Tag.). 



POTAMOGETON PERVERSUS A. Benn. in Philip. Journ. Sci. 9 (1914) 

 Bot. 343. 



Luzon (Bontoc), Vanoverbergh 249, 2684. In shallow slow streams and 

 in rice paddies, altitudes about 1,300 m. India to China, Manchuria, Korea, 

 and Formosa. 



Local name: fbas (Bon.). 



POTAMOGETON PHILI PPIN ENSIS A. Benn. in Philip. Journ. Sci. 9 

 (1914) Bot. 342, hybr. P. malainus X P. maackianus. 

 Potamogeton nipponicus Ostenfeld in Philip. Journ. Sci. 9 (1914) 

 Bot. 260, non Makino. 

 Mindanao (Lanao), Clemens. In shallow water of Lake Lanao, altitude 

 about 650 m. Endemic. 



POTAMOGETON PUSILLUS Linn. Sp. PL (1753) 127; A. Benn. in Philip. 

 Journ. Sci. 9 (1914) Bot. 342. 

 Luzon (Benguet), Elmer 5951. In shallow water, altitude about 1,300 

 m. Widely distributed in Europe, Asia, Africa, and North America. 



POTAMOGETON TEPPERI A. Benn. in Journ. Bot. 25 (1887) 178; Philip. 

 Journ. Sci. 9 (1914) Bot. 340. 



Luzon (Benguet), Merrill Phil. PI. 1722, Elmer 5952, Topping 45, B. S. 

 14110 Robinson. In shallow water, altitude about 1,300 m. Yunnan and 

 Australia. 



EXCLUDED SPECIES 



Potamogeton ceispus Linn,; Naves Novis. App. (1882) 297. 

 Potamogeton natans Linn.; Naves 1. c. 

 Potamogeton javanicus Linn.; Naves 1. c. 



