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The Philippine Journal of Science 
3602 ! Hokiang, Faber 314 ! Formosa, Oldham 636 ! Mandschuria 
Litwinow 2445 ! 3351 ! India, Khasia, Hooker & Thomson ! Kasmir, 
C. B. Clarke ! Siberia “ad ostium fl. Lena” Maack ! Japan, Aomori, 
Faurie ! Hitroyoshi, Faurie US 05 ! (Many other Japanese specimens 
which are too poor to name may belong to this species.) Corean Archipel- 
ago, Oldham 824! Philippine Islands, Luzon, Subprovince of Bontoc, 
Vanoverbergh 209, 2684, eight specimens on three sheets, altitude 1,290 me- 
ters, the Igorot name ibas. 
Potamogeton polygonifolius Pourr. Act. Toul. 3 (1788) 325. 
Java, Zollinger 3784, teste Graebner in Pflanzenreich 1907. 
This is the only record I have of it from Malaya and I should not be 
surprised if it were P. perversus. I have not seen the specimens. Hooker 
Fl. Brit. Ind. 6 (1893) 566 gives for this “Singapore ? Wallich.” Speci- 
mens of P. polygonifolius under the name of P. elegans Wall. No. 5178 are 
labelled “Singapur?” in Wallich’s herbarium! 
Of the species of restricted distribution P. Maackianus extends north to 
46°; P. malainus, north to 46°; and P. Tepperi, to 17° 30'. 
