534 METASPERMAE OF THE MINNESOTA VALLEY. 



AMBROSIA LINN. Gen. 718 (1737). 

 Franseria CAV. Ic. II, 78 (1793). 

 Hemiambrosia DELP. Stud. Art. 57 (1871). 

 Hemixanthidium DELP. 1. c. 62 (1871). 

 Xaiithidium DELP. 1. c. 62 (1871). 

 Hymenoclea T. and G. PI. Fendl. 79 (1849). 



Baillon, Hist. PL VIII, 286; Benth. and Hook., Gen. PL II, 354; Du- 

 rand, Ind. Gen. Ptian. 207; Engler and Prantl, Nat. Pflanz. IV, 5, 221 

 (Hoffmann). 



Living species: 35 ; Mediterranean region, Africa, 

 N. and C. America, Sandwich Isls. U. S., 24; Canada, 6; S. 

 Sts., 4; California, 13; Rocky mts., 7; W. Tex., 5. 



Ambrosia psilostachya DC. Prodr, V, 526 (1836). 

 A. peruviana DC. Prodr, V. 526 (1836). 

 A. coronopifolia T. and G. Fl. II, 291 (1841). 



Wats, and Coult., Gray's Man. 6 ed. 273; Coult., Fl. Colo. 181; Webb., 

 Fl. Neb. 147; Mac., Fl. Can. I, 240; Upham, Fl. Minn. 79; Brew, and 

 Wats., Fl. Calif. I, 344; Griseb., Fl. W. I.; Wats., King Exp. 165; Roth., 

 Wheel. Exp. 158; Cov., Fl. Ark. 194; Gray, Syn. Fl. I, 2, 250; Coult., Fl. 

 Tex. 210. 



North America: 49 N. in N. W. T. and Saskatche- 

 wan to Minn. , Wise. , 111. , Neb. , Tex. and Mex. to Calif. , Nev. 

 and Arizona. 



Minn, valley: Throughout; habitat as in A. artemis 

 iaefolia Linn. 



HERB. : Taylor 1146, Starbuck, Pope Co ; Sheldon 

 1522, Lake Benton; Oestlund 95, Hennepin Co.; Sandberg 316, 

 Red Wing. 



Ambrosia artemisiaefolia LINN. Spec. 987 (1753). 

 A. elatior LINN. Spec. 988 (1753). 

 Iva monophylla WALT. Fl. Car. 233 (1788). 

 Ambrosia absinthifolia MICHX. Fl. N. Am. II, 183 (1803). 

 A. paniculata MICHX. Fl. N. Am. II, 183 (1803). 

 A. heteroptylla MUHL. Willd. Spec. IV, 378 (1805). 

 Wats, and Coult., Gray's Man. 6 ed. 273; Britt., Fl. N. J. 143; Webb., 

 Fl. Neb. 147; Upham, Fl. Minn. 79; Mac., Fl. Can. I, 240; Chap., Fl. S. 

 St. 223; Coult., Fl. Colo. 180; Brew, and Wats., Fl. Calif. I, 344; Griseb., 

 Fl W. L; Wats., King Exp. 165; Cov., Fl. Ark. 194; Engl. Hoffmann, 

 Nat. Pflanz. IV, 5, 222; Gray, Syn. Fl. I, 2, 249; Coult., Fl. Tex. 210. 

 Introduced in W. Europe; Brazil and W. Indies. 

 North America: Across continent to Mex. and Hud- 

 son Bay, N. W. T. and Labrador. 



Minn, valley: Throughout; hillsides, fields, roads, 

 thickets and forest openings. 



HERB.: Taylor 753%, Elysian; Bollard 891, St. Boni- 

 facius; Oestlund 94, Minneapolis; Oestlund 95, Hennepin Co.; 

 Holzinger 122, Winona Co. ; Sandberg 315, Red Wing. 



