132 METASPERMAE OF THE MINNESOTA VALLEY 



Calla palustris LINN. Spec. ed. 2, 1373 (1762). 



C. aetfiiopica GAERTN Fruct. II, 20 (1791). 



Wats, and Coult., Gray's Man. 6 ed. 550; Britt., Fl. N. J. 253; Mac., Fl. 

 Can. II, 73; Upham, Fl. Minn. 134; Nym., Fl. Eur.; Led., Fl. Ross. IV, 11; 

 Bicht., PI. Eur. 171; Herd., Fl. Eur. Russ. 122; Engl., Nat. Pflanz. II, 3. 

 123; Hart., Fl Scand. I, 428. 



Europe, N. of Alps and Carpathians; Siberia. 

 North America: N. S., N. Br., Q , Ont., Man. to Sas- 

 katchewan and Hudson Bay, N. W. T.; S. to N. Eng., N. J., 

 Mich, and Minn. 



Minn, valley; N. E. district only; cold marshes and 

 bogs; perhaps N. W. 



HERB. : Bailey 98, Vermilion lake; Eoberts 123, Duluth; 

 Sheldon 2000a, Keegan's lake; MacM. 107a, Taylor's Falls. 



ARISAEMA MART. Flora, II, 459 (1831). 



Benth. and Hook., Gen. PI. Ill, 965; Durand, Ind. Gen. Phan. 430; 

 Engler and Prantl, Nat. Pflanz. 2, III, 150 (Engler). 



Living species: 50 ; mostly temperate and subtropi- 

 cal Asia; 1-2, Abyssinia; N. America, 3-4; Canada, 2; E. sts., 

 2; S. sts., 3; only in Atl. Region 



Fossil species: Araceae (see Schenck, Palacophyt, 377). 



Arisaema triphyllum (LINN.) TORR. Fl. N. Y. II (1843). 

 Arum triphyllum LINN. Spec. 1365 (1758) pro parte. 

 Arisaema atrorubens BLUME, Rumphia I, 97 (1835j. 

 Wats, and Coult., Gray's Man. 6 ed. 549; Britt., Fl. N. J. 252: Chap., 

 Fl. S. St. 440; Upham, Fl. Minn. 134; Mac., Fl. Can. II, 72; Webb., Fl. 

 Neb. 97; Cov., Fl. Ark. 227. 



North America: N. S., N. Br., Q., Ont., N. Superior 

 region to Man.; S. to N. Eng., N. J., Fla.; W. to Minn., Neb., 

 E. Kansas and Ark. 



Minn, valley: Throughout; abundant; rich woodland 

 and shaded river-banks. 



HERB.: Tay lor 432a, Janes ville; Bollard 58, Chaska; 

 Arthur 156, Vermilion lake; Herrick 278, Minneapolis; Kas- 

 .sube 221, Minneapolis; Sandberg 523, Vasa; Herb. Wickersheim 

 .116, Lake Benton; Herb. Moyer 227, 228, Montevideo. 



XI. LEMNACEAE. Duck-Weed Family. 

 Pistiaceae LINDL. Veg. Kingd. (1846) in part. 



Endlicher, Gen PL 232 (1840); Benth. and Hook., Gen. PI. Ill, 1000 

 11883); Engler in Engler and Prantl, Nat. Pflanz. 2, III, 154 (1887). 



Genera: 2; temperate and tropical regions. 

 Species: 24 ; over one-half in tropics. 



