364 ROSACEAE 



i. P. simplex Michx. Moist shaded places: N. S. to Minn., 

 Mo. and the mountains of Ala. and N. Car. 



Common throughout the area except in the pine-barrens, there 

 rare and local and probably adventive; always increasing north- 

 ward. 



2. P. pumila Poir. Sandy or dry soil: Me. to Ga., Ohio and Ont. 



Throughout the area except in the pine-barrens, always decreasing 

 inland, and frequently replacing P. canadensis along the coast. 



3. P. canadensis L. Dry ground: N. B. to Wise, eastern Texas. 



Ala. and N. Car. 



Throughout the area, except in the pine-barrens, there rare and 

 local, and probably adventive; always increasing northward. 



4. P. monspeliensis L. Rich soil and waste places: Lab. to 



D. C, Kan., Mex., Calif, and Alask.; also in Europe and 

 Asia. 



Throughout the area except in the pine-barrens, becoming very 

 common northward. 



5. P. argentea L. In waste places and in fields: N. S. to the 



Dakotas, Kan. and D. C. Native of Europe. 



Common as a weed throughout the area, probably introduced 

 into the pine-barrens. 



6. P. intermedia L. Fields and roadsides and waste places: 



E. U. S. Native of Europe. 



Rare as a ballast plant near the larger cities. 



7. P. recta L. Roadsides and waste places: E. U. S. Native 



of Europe. 



A rare adventive in Conn, and N. Y., hardly persisting. 



8. P. sulphurea Lam. Fields and waste places: Vt. to D. C, III. 



and Mich. Native of Europe and Asia. 



A rather rare adventive near most of our larger towns and cities. 

 P. paradoxa Nutt. has been found as a waif. 



8. Argentina Lam. 



Leaf rachis densely pubescent; achenes corky. I. A. Ansa inn. 



Leaf rachis glabrate; achenes not corky. 2. A. liltoralis. 



I. A. Anserina (L.) Rydb. Roadsides and fields: E. N. S. 

 Naturalized from Europe and Asia. 

 A rare or occasional adventive. 



