21 
161. Potamogeton filiformis Pers. Syn. 1: 152 (1805). 
162. Potamogeton foliosus Raf. Med. Rep. (II.) 5: 354 (1808). 
Potamogeton paucifiorus Pursh, Fl. Am. Sept. 121 (1814) 
163. Potamogeton foliosus Niagarensis (Tuckerm.) Morong, 
Mem. Torr. Club, 3: Part 2, 39 (1893). 
Potamogeton Niagarensis Tuckerm. Am. Journ. Sci. CII.) 7: 
354 (1849). 
164. Potamogeton gemmiparus (Robbins) Morong, Coult. Bot. 
Gaz. 5: 51 (1880). 
LPotamogeton pusillus var. (?) gemmiparus Robbins in A. Gray, 
Man. Ed. 5, 489 (1867). 
165. Potamogeton heterophyllus Schreb. Spicileg. Fl. Lips. 21 
(1771). 
Potamogeton gramineus Fries, Novit. Ed. 2, 36 (1828), not L. 
Lotamogeton gramineus var. heterophyllus Fries, Novit. Ed. 2, 
35 (1828). 
166. Potamogeton heterophyllus graminifolius (Fries) Morong, 
Mem. Torr. Club, 3: Part 2, 24 (1893). 
Potamogeton gramineus var. graminifolius Fries, Novit. Ed. 2, 
36 (1828). 
166a. Potamogeton heterophyllus longipedunculatus (Merat) 
Morong, Mem. Torr. Club, 3. Part 2, 24 (1893). 
Potamogeton longipedunculatus Merat. Fl. Paris (according to 
A. Bennett). 
16;. Potamogeton heterophyllus maximus Morong, Mem. Torr. 
Club, 3: Part 2, 25 (1893). 
168. Potamogeton heterophyllus minimus Morong, Mem. Torr. 
Club, 3: Part 2, 25°(1893). 
169. Potamogeton heterophyllus myriophyllus (Robbins) Mo- 
rong, Mem. Torr. Club, 3: Part 2, 24 (1893). 
Potamogeton gramineus var. myrtophyllus Robbins in A. Gray, 
Man. Ed. 5, 487 (1867). 
170. Potamogeton Hillii Morong, Coult. Bot. Gaz. 6: 290 (1881). 
171. Potamogeton Illinoensis Morong, Coult. Bot. Gaz. 5: 50 
(1880). . 
172. Potamogeton interruptus Kitaibel in Schultes, Oest. Fl. Ed. 
2, 328 (1814). 
Potamogeton flabellatus Bab. Man. Bot. Ed. 3, 324 (1851). 
173. Potamogeton lateralis Morong, Coult. Bot. Gaz. 5: 51 (1880). 
174. Potamogeton lonchites Tuckerm. Am. Journ. Sci. CII.) 6: 226 
(1848). 
