240 QEOIiOGICAL 8UKVEV OK CANADA. 



284. IVA, Linn. iMARSH ELDER.) 

 (HIT.) I. axillaris, I'lirsh. Ilu..k. Kl. I., :jii!i. 



Oil dry 111- wet >:iliiio soil. Aloiii;tlK' S;isIv;i(cIk'\v;iii I'loiii ('ailloii to 

 IvImoiiloM. {Driimiinniii.) Voiy common on llu' m:iri!;in ol' saline 

 laUos anil |Minils tliroiii!;li(int llir prairie I'r^ion. (^Alacviin.) Short 

 Crook'. Souris Kivor, 4!Uli paralU-l, ami aluniilanl westward on hard 

 l)akod I lay. {Ihiirson.) 



(Ills.) I, xanthiifolia, Nuti. 



CiK'lnclnnia .vantliiifotld, Fros. Tnrr. iV; <Jray, Fl. II., L'S(i. 

 In .-illiivial soil aloni;' I'ivi'rs and small streams. IJeed Fjake, west of 

 Old Wives' Lakes ; at better's Farm, Cypress Hills ; and on the slope 

 of the higii hank hotween Fort Edmonton ami theiiver. (Macoiin.) 

 .Swift CiUTont Ci-eek, C. V. U. Crossini;" ; and at Fort Qii'Appelle close 

 to the irudsun Bay Co.'s store. (-/. M. Macoun C. P. K. Coll.) 



285. Ambrosia, Tourn. (RAG-WEED.) 



(1119.) A. trifida, Linn. 



Low groiauls aloiig streams. Common in the vicinity of Montreal. 

 {Holmes d- Ami.) In a boggy tiold near St. Louis Dam, Ottawa. 

 (Macoun d- Fletcher.) Cayuga and Maiden, Ont. (Mac/agan.) Along 

 the northern slope of the Cypress liills. (llacoun.) Vicinity of 

 Winnipeg. {Bourgeau.) 



Var. integrifolia, Torr. & Gray Fl. IL, 290. 

 A. intajrijoiia, :Muhl. Piirsh. Fl. IL, .-)80. 



On alluvial soil in river valleys. On alluvium along Maple Creek, 

 Cypress liills. {Macoun.) Near Milk Eiver, on low fertile prairie 

 land, 49th pai-allel. {Dawson.) 



(1120.) A. artemisiaefolia, Linn. 



A. tkilior, Linn. Hook. Fl. I., 309. 



A. pankulata, Michx. Hook. Fl. I., 309, in part. 



Veiy common as a weed along railroads, ami in towns and villages, 

 throughout Canada to the Eocky Mountains. 



(1121.) A. psilostachya, DC. 



A. coronopifolia, Torr. & Gray Fl. IL, 291. 

 Lake of the Woods, and westward along the 49th parallel over the 



