LIST OF HIGHER SEED-PRODUCING PLANTS. 205 



ingen (Heer); Amber (Baltic Sea — Comventz.)\ Quaternary or 

 Pliocene, Japan {Nathorsi) ; 6 or 7 sp. See also Saporta. 



Polygonum acre HBK. N. Gen. et. Spec. II, 179 (1817). 

 P. hydropiperoides Puksh, F\. Am. 270(1814). 

 P. hydropiper Micnx. Fl. N. Am. I, 238 (1^03). 

 P. punclatum Ell. Sk. I, 455 (1824). 

 Wats, and Coult., Gray's Man. 6 ed. 442; Britt., Fl. N. J. 209; Mac, 

 Fl. Can. I, 411; Webb., Fl. Neb. 112; Upham, Fl. Minn. 119; Chap., Fl. S. 

 St. 389: Cov., Fl. Ark. 215; Engl.-Damm., Nat. Pfl. 3, I «, 38; Greene, Fl. 

 Fran. 136. 



North America: Ont. and N. Eng. to Minn., Dak. and 

 Neb.; S. to Fla., Mo. and Ark. 



Minn, valley: N. E. district; wet places, around lakes 

 and pools. 



Herb.: Bailey 370, Mud river; Holzinger 197, Wi- 

 nona Co. 



Polygonum hydropiper Linn. Spec. 517 (1753). 

 P. glandulosum Poik. Enc. Meth. VI, 149 (1804). 

 P. mite Ell. Sk. I (1821). 

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

 Fl. Can. I, 411; Webb., Fl. Neb. 112; Upham, Fl. Minn. 119; Coult., Fl. 

 Colo. 320; Led., Fl. Ross. Ill, 523; Nym., Fl. Eur.; Herd., Fl. Eur. Russ. 

 112: Chap., Suppl. S. St. 645; Roth., Wheel. Exp. 232; Hart., Fl. Scand. I, 

 333: En^l.-Damm., Nat. Pflanz. 3, I a, 28. 



All Europe; Arctic Russia to Caucasus, Siberia and 

 Dahuria. 



North America: Atl. to Pac. in Can.; S. to Minn., 

 Neb. and Mo.; introd. E. of Mississippi valley; S. to N. Ga. 



Minn, valley: Throughout: wet ground; shores of 

 lakes and streams. 



Herb.: Sheldon 1477, Pipestone City; Taylor 1153, 

 Olenwood; Ballard 604, Prior lake, Scott Co.; Ballard 661, 

 Waconia; Taylor 828, Glenwood; Ballard 722, Benton, Carver 

 Co. ; Ballard 849, Patterson lake, Carver Co. ; Eoberts 114, Dul- 

 uth; Roberts 115, Stewart river; Sandberg 481, Red Wing. 



Polygonum liydropiperoides Michx. Fl. N. Am. I, 239 



(1803). 



P. mite PURSH, Fl. Am. 270 (1814). 

 P. persoonii Engelm. in Herb. Ledebour. 

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

 Fl. Can. I, 411; Chap. Fl. S. St. 389; Upham, Fl. Minn. 119; Cov., Fl. Ark. 

 216; Webb., Appx. Neb. 27; Engl.-Daram., Nat. Pfl. 3, I a, 28. 

 S. America and Australia. 



North America: N. Br., Ont, N. Eng. to N. J. and 

 Fla.; W. to Minn., Neb., Mo. and Ark. 



