106 
IOWA ACADEMY OF SCIENCES. 
Colorado. — A western plant ranging from New Mexico to 
Idaho. It has been reported from Iowa and from northern 
Michigan, and is undoubtedly extending westward. The plant 
produces seed in considerable quantity and propagates only by 
seed. It is in many places a serious pest in cultivated fields 
because of its abundance and rapid growth. (C. S. Crandall, 
Bulletin No. 23, Col. Agr’l. Exp. Sta. 1893, p. 9). Prom head 
waters of Clear Creek, Platte valley, 1863. (C. C. Parry). 
(Powell’s Colorado exploring expedition to the Rocky mountains, 
Lat. 40-11^). 1863, George Vasey. Sunset Canon (Penard). 
Big Muddy river. Colorado Springs, (Torrey.) Platte valley, 
(C. C. Parry.) 
Dakota, North. — 'Tn all parts of the state in rich soil 
and waste places, common throughout the Red River Valley 
as much as Ambrosia trijida is in Illinois, but only a waste place 
weed.” (H. L. Bolley.) “The most abundant and rank weed 
in rich soil, waste places, roadsides and about stables and 
deserted dwellings, throughout the Red River Valley and west- 
ward.” (Upham, Proceedings of Boston Soc. of Nat. History, 
Vol. XXV, 1890, p. 160.) 
Western Dakota and Northern Montana. — Iva xantM- 
folia. Nutt. Common in Minnesota, is replaced by 7. axillaris 
Pursh; (John B. Leiberg, Notes on the Flora of western Dakota 
and eastern Montana, adjacent to the Northern Pacific Railroad. 
Rep. Minn. State Hort. Soc., 1884, p. 365.) 
South Dakota. — Distribution quite general throughout the 
state. Brookings, (Thomas A. Williams.) 
Illinois. — (Athens, 1863, Hall.) 
Indian Territory. — (C. H. Thompson.) 
Iowa. — In all places mentioned extremely abundant, occupy- 
ing waste places in streets, near neglected buildings, a tall, 
coarse and homely weed, in many cases eight to ten feet high. 
Arthur (Contributions to Flora of Iowa. A Catalogue of the 
Phaenogamous Plants, p. 18. Appendix to Flora of Iowa, 1876, 
p. 40). 
Charles City (Arthur, History of Floyd county). 
Boone (Pammel, Report Comm, on State Flora. Proceed- 
ings Iowa Acad, of Sciences, Vol. I, Part II, p 17). 
Boone, 1890 (Pammel). Keokuk, 1890. (Rolfs.) 
Boone, 1894 (Pammel). Woodbine, 1894. (Pammel.) 
Vale, 1894 (Pammel). Mason City, 1894. (Pammel.) 
Missouri Valley, 1894 (Pammel). Turin, 1894. (Pammel.) 
