38 METASPERMAE OF THE MINNESOTA VALLEY. 
P, acuminatus ScHuUM. Enum. Sill. I, 49 (1801). 
P. volhynicus BrEss., R. and 8. Syst. III, 509 (1818). 
P. cornutus Pr. FI. Cech. 37 (1819). 
P. caudatus SEID. Op. Béhm. Gew. 23 (1823). 
P. proteus f. lucens CHAM. and ScHLEcHT. Linn. II, 197 (1827). 
Wats. and Coult., Gray’s Man. 6 ed. 562; Upham, Fl. Minn. 136; Mac., 
Fl. Can. II. 85; Chap., Fl. So. St. 446?; Wats., Fl. Calif. II. 196; Coult., Fl. 
Colo. 363; Hook., Fl. Gt. Brit. 482; Nym., Fl. Eur.: Led., Fl. Ross. IV. 26; 
Richt., Pl. Eur. 14; Herd., Fl. Eur. Russ. 124; Hart., Fl. Scand. I 433. 
Europe; Asia; N. Africa; Australia; W. Indies. 
North America: N. S., Q., Ont. to Keewatin; S. to 
Minn., Ark., N. Mex.; E. to N. Eng. and Fla?.; also California. 
Minn. valley: Throughout; infrequent; ponds and lakes. 
HERB.: Taylor 1002, Glenwood; Oestlund 184, Minne- 
haha; Herrick 282, Minnetonka; Ballard 600, Prior’s Lake, 
Scott Co. 
Potamogeton praelongus WuLr. Roem. Arch. III, 331 
(1803-5). 
P. lucens WEBB. Prim. Holst. 15 (1780) not Linn. 
P. flexicaule DETH. Strel. Anz. n 50 (1809). 
P. flecuosus (SCHL. and) WRED. Meckl. Fl. I (1811). 
P. acuminatus WAHL. Fl. Ups. 116 (1820). 
Wats. and Coult., Gray’s Man. 6 ed. 562; Britt., Fl. N. J. 258; Richt., 
Pl. Eur. 14; Mac., Fl. Can. II. 85; Hook., Fl. Gt. Brit. 433; Nym., Fl. Eur., 
Wats., FI. Calif. II. 197. 
Europe. 
North America: N. S. to Vancouver; S. to Mass., 
Minn., Iowa. 
Minn. valley: Forest district; ponds and lakes or 
sluggish streams. 
HERB.: Sheldon 319, Madison Lake; Bailey 404, Burnt- 
side Lake. 
Potamogeton lanceolatus Sm. Engl. Bot. 1985 (1808). 
P. perfoliatus var. lanceolatus ROBBINS, Gray’s Man. 5 ed. (1868). 
P. perfoliatus var. richardsonii BENNETT, Mac. Fl. Can. II, 370 
(1890) in part? 
Wats. and Coult., Gray’s Man. 6 ed. 562; Coult., Fl. Colo. 363; Wats., 
Fi. Calif. II. 197; Mac., Fl. Can. II. 86; Upham, Fl. Minn. 137; Hook., Fl. 
Gt. Brit. 434; Richt., Pl. Eur. 13; Roth., Wheel. Exp. 268?. 
Europe. 
North America: Ont. to Rockies and 62° N. lat.; S. to 
N. J., Fla. and N. Mex.; W. to Pac. coast and Yellowstone 
basin. 
Minn. valley: Forest district and probably W.; ponds 
and streams. 
HERB.: Holzinger 266, Winona Co.; Bailey 149, Ver- 
milion Lake, and Sandberg, Hennepin Co., in herb. Morong. 
