340 The Philippine Journal of Science 1914 
choides Cham & Schlecht. to P. condylo carpus Tausch may be quoted, 
and on this Schumann in Flora Brasiliensis 3 5 (1894) 709 very rightly 
puts stress, showing that care is needed and that slight differences must 
be taken into account, not as specific, but as endemic, or edaphic variations, 
and especially this has to be considered in the Australian species of the 
genus. 
2. POTAMOGETON CRISTATUS Regel & Maaek FI. Ussur. (1861) 9, t. 
10, f. 3-6. 
Potamogeton hybridus Makino (non Michx.) 111. FI. Japan 2 (1891) 
t.55. 
China! Mandschuria! Japan! Formosa, Faurie 528! 
The most extraordinary fruited species of the genus. 
*3. POTAMOGETON TEPPERI A. Benn. in Journ. Bot. 25 (1887) 178. 
Luzon, Subprovince of Benguet, Trinidad, Topping J5, January, 1903, 
growing in a small lake; Baguio and vicinity, Bur. Sci. HI 10 Robinson, 
May, 1911, Elmer 5952, April, 1904, common about margins of a small 
pond. China, Province of Yunnan, Abbe Delavay ex M. Franchet! Aus- 
tralia, Cygnet River, at Knicks, O. Tepper! 
The description of Potamogeton Tepperi needs revision: Stem 18 to 24 
inches long, sparingly branched. Leaves, lower, 3 to 4J inches long by 
1 to 11 in. wide; petioles 11 inches long with 7 principal nerves and 10 
secondary ones. Upper leaves suborbicular. Stipules 11 to 2 inches long, 
persistent to time of flowering, acute, with numerous nerves. 
As indicated below there are two species confused, or combined, under 
the name P. Tepperi. The original plant belongs to the Australian series 
of thick leaved species in the floating leaves; some are almost leathery 
in consistence while the others placed under P. Tepperi are like the 
European species, thin leaved and the nerves generally semiexposed. 
4. POTAMOGETON INDICUS Roxb. FI. Ind. ed. Wall. 1 (1820) 471. 
Potamogeton Roxburghianus Roem. & Schult. Syst. Veg. Mant. 3 (1827) 
367. 
Sumatra, Teysmann in herb. Buchenau, Bremen ! Japan, Faurie in 
herb. Boissier 7530 ! India ! Thibet ! Upper Burma ! Assam ! 
*5. POTAMOGETON ANGUSTIFOLiUS Berchtold & Presl Rostlinar 2 
(1821) 19. 
Potamogeton Zizii Mert. & Koch ex Cham. & Schlecht. in Linnaea 2 
(1827) 202. 
Potamogeton heterophyllus Schreb. var. latifolius Mert. & Koch Deutch. 
FI. ed. 3 (1823) 845. 
Potamogeton lucens L., var. heterophyllus Fries Nov. FI. Suec. ed. 2 
(1828) 34. 
Luzon, Subprovince of Benguet, Trinidad, Loher 1597 in herb. Kew. ! 
Kasmir, C. B. Clarke 29139 ! Himalaya, Strachy & Winterbottom ! 
China, Yunnan, Abbe Delaway in herb, Paris ! Upper Burma, Abdul 
Khalil ex Dr. Prain ! Europe ! N. America ! Cuba ! Madagascar ? 
