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THE PHILIPPINE JOURNAL ‘OF ScIENCE, C. BOTANY. 
Vol. IX, No. 4, August, 1914. 
THE POTAMOGETONS OF THE PHILIPPINE ISLANDS 
By ARTHUR BENNETT 
(Croydon, England) 
Through the kindness of Mr. E. D. Merrill I have been enabled 
to examine the representatives of the genus Potamogeton be- 
longing to the herbarium of the Bureau of Science. This has 
enabled me to add one species to the flora. For the sake of 
convenience I have considered the species in the order that they 
appear in Ascherson and Graebner’s monograph of the family.’ 
I have also noted the species of surrounding countries in the 
hope that they may eventually be found in the Philippines. 
Those species which have actually been found in the Archi- 
pelago I have indicated with an asterisk. 
1. POTAMOGETON JAVANICUS Hassk. in Act. Soc. Ind.-Neerl 5° (1856) 
26. 
Potamogeton heterophyllus Ham. in Wall. Cat. (1831) no. 5181. 
Potamogeton tenuicaulis F. Muell. Frag. Phyt. Austral. 1 (1858) 90 
244; 7 (1865) 217. 
Potamogeton hybridus Hook. f. & Th. (non Michx.). 
Potamogeton parvifolia Buchenau in Abh. Naturw. Ver. Bremen 7 (1880) 
32. 
Java, Forbes 104! Formosa, Oldham 881,637! COREA, Wilford 968! 
CHINA, Maingay 170! 
Inp1A, Khasia Hills, 6,000 ft. alt.! Himalaya, 7,000 ft.! Sikkim 9,000 
ft.! AFrica! AUSTRALIA! 
Although Doctor Schinz and I have considered these all to belong to 
one species, at the present time I am in doubt as to whether or not this 
is true. The figure of the fruit given by Ascherson & Graebner’ certainly 
does not belong to Potamogeton javanicus Hassk. but may have been 
drawn by mistake from P. orientalis Hagst. Hasskarl in his deséription 
says “fructus drupacei viridi subrotunda 3-cristata..........-- cristis lateralibus 
minus promunalis 2 gibbis, intermedia sinuata 3-4 gibba.” Buchenau has 
“Fructus........---- dorso carinati, basi bituberculata”, and Mueller “carpi- 
TS dorso tricarinatus et repando-denticulatis.” 
But in the species of Potamogeton with tubercled fruits, the variation 
in this character is great; for instance the range of variation from P. tri- 
1 Engl. Pflanzenreich 31 (1907) 1-184. 
2L. ¢. 47, fig. 14 C. 
339 
