Part 1, 1909] ZANNICHELLIACEAE 27 
Potamogeton coloratus Vahl, F1. Dan. p/. 1449 (1820), occurs in the Bahamas according 
to Ascherson and Graebner (in Engler, Pflanzenreich 4": 69). Eggers 4080 from Hog 
Island and Brace (not Bruce) 395 are cited. The species is otherwise known from Asia, 
Africa, and Australia, 
Potamogeton Leschenaultit Cham. & Schlecht. Linnaea 2: 223 (1827), may occur in 
Porto Rico according to Urban (Symb. Ant. 4: 72). Szntents 6670, from Manati, is cited, 
This lacks fruit, but resembles P. occidentalis Sieber. The species is otherwise known from 
Teneriffe. 
Potamogeton longifolius Gay; Poir. in Lam. Encyc. Suppl. 4: 535 (1816), occurs in 
Oregon according to A, Bennett (Ann. Hofmus. Wien 7: 290.) A single specimen is cited. 
The species is otherwise known from Africa and Australia. 
Potamogeton nitens Weber, in Wigg. Prim. Fl. Holsat. Suppl. no. 11 (1787), occurs in 
New York, Massachusetts, and Michigan, according to A. Bennett (Jour. Bot. 39: 199). 
No fruiting material has ever been found in America. The species is otherwise exclusively 
Scandinavian. 
Potamogeton strictus Philippi, Fl, Atacam. 50 (1860), is given by Ascherson and Graebner 
(in Engler, Pflanzenreich 4: 129) as occurring in Nicaragua. ‘‘ Bolandier’’ (Ber- 
landier ?) 111 is cited. The species is otherwise known only from South America, 
Potamogeton vaginatus Turcz, Bull. Soc. Nat. Mosc. 1837: 102 (1837), occurs in Sas- 
katchewan and Northwest Territory, Canada, according to Macoun (Cat. Can. Pl. 4: 371). 
The specimen cited is 70. 3189, The species is otherwise known from Europe and Asia. 
EXCLUDED SPECIES 
Potamogeton densus Beck, Bot. 386 (1833), is a Philotria. 
Potamogeton pinnatum Walt. Fl. Car. 90 (1788), is Myriophyllum pinnatum (Walt.) 
B.S. P. 
Potamogeton Liebmanni Buch. Abh. Nat. Ver. Bremen 3: 349 (1872), is Heteranthera 
dubia (Jacq.) MacM. 
