182 METASPERMAE OF THE MINNESOTA VALLEY 
Calla palustris Linn. Spec. ed. 2, 1873 (1762). 
C. aethiopica 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; 
Richt., Pl. Eur. 171; Herd., Fl. Eur. Russ. 122; Eogl., 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. toN. Eng., N. J., 
Mich. and Minn. 
Minn. valley; N. E. district only; cold marshes and 
bogs; perhaps N. W. 
Hers.: Bailey 98, Vermilion lake; Roberts 123, Duluth; 
Sheldon 2000a, Keegan’s lake; MacW. 107a, Taylor’s Falls. 
ARISAEMA Mart. Flora, IT, 459 (18381). 
Benth. and Hook., Gen. Pl. III, 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., 8; only in Atl Region 
Fossil species: Araceae (see Schenck, Palaeophyt, 377). 
Arisaema triphyllnm (Linn.) Torr. Fl. N. Y. IT (1848). 
Arum triphyllum LINN. Spec. 1365 (1758) pro parte. 
Arisaema atrorubens BLUME, Rumphia I, 97 (1835). 
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.: Taylor 432a, Janesville; Ballard 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 LinpL. Veg. Kingd. (1846) in part. 
Endlicher, Gen Pl. 232 (1840); Benth. and Hook., Gen. Pl. III, 1000 
{1883); Engler in Engler and Prantl, Nat. Pflanz. 2, III, 154 (1887). 
Genera: 2; temperate and tropical regions. 
Species: 24+; over one-half in tropics. 
