206 METASPERMAE OF THE MINNESOTA VALLEY. 



Minn, valley: Throughout; wet places, edges of pools 

 and lakes, in the water. 



HERB.: Sheldon 881, Sleepy Eye; Herrick 257, Minne- 

 apolis; H errick 258, Minneapolis; Uestlund 159, Hennepin Co. ; 

 Oestlund 160, Hennepin Co. ; Herb. Sheld. 1674, Minneapolis. 



Polygronum hartwrightii GRAY, Proc. Am. Acad. VIII, 

 294 (1870). 



Wats, and Coult., Gray's Man. 6 ed. 441; Britt., PL N. J. 209; Webb., 

 Fl. Neb. 112; Mac., Fl. Can. I, 410; Wats., Fl. Calif. II, 14; Upham, Fl. 

 Minn. 119; Coult., Fl. Colo. 320; Greene, Fl. Fran. 136. 



North America: Anticosti, Ont. to Hudson Bay and 

 Owen Sound; S. to N. Eng. and N. J. ; W. to Minn., Iowa, Neb., 

 Utah, California and Pac. coast. 



Minn, valley: Throughout; moist banks and shores 

 and around pools. 



HERB.: Taylor 224, Janesville; Sheldon 648, Waseca; 

 Sheldon 988, Sleepy Eye; Oestlund 161, Hennepin Co.; Bailey 

 417, Long lake. 



Polygonum emersum (Mionx.) BRITT. Cat. N. J. 209 (1890). 

 P. bistorta WALT. Fl. Oar. 131 (1788) not Linn. 

 P. amphibium var. terrestre WILLD. Spec. II (1799). 

 P. amphibium emersum MICHX. Fl. N. Am. I, 240 (1803). 

 P. coccinneum terrestre MUHL. Cat. 40 (1813). 

 P. amphibium var. (?) muhlenbergii MEISN. Mon. Polyg. (1856). 

 P. muhlenbergii S. WATS. Proc. Am. Acad. Sci. XIV (1879). 

 P. terrestre B. S. P. Cat. N. Y. (1888). 



Wats, and Coult., Gray's Man. 6 ed. 441; Britt., Fl. N. J. 209; Upham, 

 Fl. Minn. 119; Mac., Fl. Can. I, 410; Wats., Fl. Calif. II, 13; Coult., Fl. 

 Colo. 320; Mac., Fl. Can. 11,353; Roth., Wheel. Exp. 232; Webb., Appx. 

 Neb. 27; Greene, Fl. Fran. 137. 



North America: Prairie regions of Can. to Saskatch- 

 ewan and Brit. Col. ; S. to N. Eng., Fla. and'Miss. ; W. to Wash- 

 ington, Oregon, Calif, and Tex. 



Minn, valley: Throughout; wet places; sandy beaches 

 and shores of streams. 



HERB.: Sheldon 1192, New Ulm; Sheldon 1396, Lake 

 Benton; Taylor 1073, Glenwood; Leiberg 56, Blue Earth Co.; 

 Herrick 259, Minneapolis; Bailey 366, Mud river; Sandberg 

 482, Red Wing; Herb. Moyer 214, 215, Chippewa river, near 

 Montevideo. 



Polygonum amphibium LINN. Spec. 361 (1753). 

 P. purpureum GILIB. Exerc. Phyt. II, 433 (1792). 

 P. amphibium var. aquaticum WILLD. Spec. II, (1799). 

 P. coccinneum MUHL Cat. 40 (1813). 

 Persicaria amphibia S. F. GRAY, Arr. II, 268(1821). 



