46 METASPERMAE OF THE MINNESOTA VALLEY. 



Elodea canadensis RICH, and MICHX. Fl. N. Am. I, 20 (1803). 

 Serpicula occidentalis PURSH, Fl. Am. 38 (1814). 

 Udora canadensis NUTT. Gen. II, 242 (1818). 

 Serpicula verticillata MUHL. Cat. (1818). 



ApalantJie schweinitzii PLANCH. Ann. Sci. Nat. 3, XI, 75 (1839). 

 Anacharis canadensis PLANCH. Ann. Mag. and Nat. Hist. 2 ser. I, 

 86 (1848). 



Udora occidentalis KOCH, Syn. 771 (1843-45). 

 Anacharis alsinastrum BAB. Ann. Nat. Hist. 81 (1848). 

 Wats, and Coult., Gray's Man. 6 ed. 496; Britt., Fl. N. J. 229; Upham, 

 Fl. Minn. 139; Wats., Fl. Calif. II, 129; Chap., Fl. So. St. 450; Mac., Fl. 

 Can. II, 1; Hook., Fl. Gt. Brit. 382; Richt., PI. Eur. 21; Herd., Fl. Eur. 

 Russ. 124; Engl., Ascherson, Nat. Pflanz. II, 1, 251; Cov., Fl. Ark. 221; 

 Hart., Fl. Scand. I, 403; Webb., Appx. Neb. 22. 



Introduced in Gt. Britain, C. Eur. and Russia. 

 North America: Q., Ont. to Saskatchewan and Assini- 

 boia; S. to Oregon and Mendocino Co., Calif.; S. to N. Eng., 

 N. J. and N. Car.; W. to Minn., Neb., Ark. and Mo. 



Minn, valley: Forest district; abundant; rivers, 

 streams and lakes. 



HERB. : Bollard 605, Prior's Lake, Scott Co. ; Bollard 

 822, Page Lake, Carver Co. ; Bollard 823a, Jordan, Scott Co. ; 

 Taylor 317, Janesville; Oestlund 189, Minnehaha; Holzinger 270, 

 Winona Co.; Holzinger 271, Winona Lake. 



YALLISNER1A LINN. Gen. 741 (1737) Em. Mich. 

 Physkium LOUR. FL Cochinch. 662 (1790). 

 Nechamandra PLANCH. Ann. Sci. Nat. 3, XI, 78 (1849). 

 ?Lagarosiphon HARV. Hook. Journ. Bot IV, 230 (1842) part. 

 Benth. and Hook., Gen. PI. Ill, 450, 451; Durand, Ind. Gen. Phan. 

 383; Eugler and Prantl, Nat. Pflanz. 2, I, 251 (Ascherson and Giirke); 

 Schenck, Palaeophyt. 390. 



Living species: 2; tropical and subtropical regions, 



extending into temperate N. and S. America. 1 sp. tropical 



Asia and Isl. of Socotra (African region) ; 1 sp. circumdiffused. 



Fossil species: Eocene, Aix (Saporta) Isp.; Jurassic 



of Siberia, 1 sp. ? (Schenck) 



Yallisneria spiralis LINN. Spec. 1015 (1753). 



Physkium natans LOUR. Cochinch. 662 (1790). 



Valksneria americana MICHX. Fl. N. Am. II, 220 (1803). 



V. jacquinii SAVI. Oss. 12 (1816). 



V. spiralis var. americana TORR. Comp. 365 (1824). 



V. jacquiniana EICHW. Fl. Gasp. Cauc. 2 (1831). 

 Wats, and Coult., Gray's Man. 6 ed. 496; Britt., FL N. J. 229; Mac., Fl. 

 Can. II, 1; Chap., Fl. So. St. 450; Upham, Fl. Minn. 139; Nym., Fl. Eur.; 

 Led., Fl. Ross. IV, 46; Richt., PI. Eur. 21; Herd., Fl. Eur. Russ. 124; 

 Engl., Ascherson and Giirke, Nat. Pflanz. II, 1, 252; Cov., Fl. Ark. 221. 



