156. NAIADACER. 195 
Saanatune (Maingay, 170!); Formosa: Tamsui (Oldham, 
381, 638!); Corea: Port Chusan (Wilford, 968!) Mus. 
Brit.; Herb. Kew. 
Japan, Tropical Asia, Africa, Madagascar, and Australia. 
8. Potamogeton limosellifolius, Maxim. ex Korshinsky, in 
Act. Hort. Petrop. xii. (1892) p. 393. 
Corra (Faurie!); Lvcuv ARCHIPELAGO (Wright ex Kor- 
shinsky). 
Amur. 
This may be a small, delicate variety or subspecies of P. Midu- 
hikimo, Makino (Ill. Fl. Jap. t. 54). 
9. Potamogeton lucens, Linn. Sp. Pl. ed. 1, p.126; Kunth, 
Enum. iii. p. 182; Hook. f. Fl. Brit. Ind. vi. p. 567. 
CurwA, without precise locality (Korolkow and Krause !). 
Mus. Brit. 
Dispersed over all the continents, but rare in Australia. 
10. Potamogeton natans, Linn. Sp. Pl. ed. 1, p. 126; Kunth, 
Enum. Pl. ii. p. 127 ; Hook. f. Fl. Brit. Ind. vi. p. 565. 
SHINGKING (James !). Herb. Kew. 
Very widely diffused, especially in temperate regions. 
Abbé David's no. 1949 enumerated by Franchet (Pl. David. i. 
p. 315) as P. natans, Linn., is not that species, and may belong 
to either P. Tepperi, A. Benn., or P. tricarinatus, F. Muell. et 
A. Benn., but in the absence of fruit it cannot be determined 
with certainty. 
11. Potamogeton oxyphyllus, Mig. in Ann. Mus. Bot. Lugd.- 
Bat. ii. p. 161. 
Corra (Faurie !). 
Japan. 
12. Potamogeton pectinatus, Linn. Sp. Pl. ed. l, p. 127; 
Kunth, Enum. iti. p. 137 ; Bunge, Enum. Pl. Chin. Bor. p. 68; 
Hook. f. Fl. Brit. Ind. vi. p. 567. 
Norra Curwa: Tanschan (Bunge!); Cuimir (Potanin !); 
Kansuu (Potanin D: Corra (Faurie!) Herb. Kew. 
Common in the north and south temperate regions; less 
frequent in the tropics. 
