DESCRIPTIONS OF SOME COMMON WEEDS 187 



stamens many, fruit densely, bristly hirsute. In shady 

 places, especially woods, but sometimes in open fields 

 from Nova Scotia to Georgia, west to Kansas, Missouri, 

 Minnesota and Wisconsin, often troublesome. 



Prairie Rose (Rosa arkansana, Porter). A low shrub 

 with prickly stem ; stipules narrow, more or less glandu- 

 lar toothed; leaves compound; leaflets seven to eleven, 

 broadly elliptical to oblong-lanceolate ; flowers in corym- 

 bose clusters, sepals occasionally hispid. Common on the 

 plains in Minnesota, Iowa, and westward to Colorado. 

 Often a very troublesome weed. 



Rosa Woodsii, stem with slender or recurved spines and 

 scattered prickles or smooth ; leaves with rather broad 

 stipules, entire ; fruit globose or globose-ovoid. Colorado, 

 Utah, and the Rocky Mountain country. 



The Rosa Sayii, also western, grows from one to two 

 feet high, very prickly; stipules usually dilated, glandular 

 and resinous; flowers usually solitary. From Minnesota 

 to Colorado and westward. 



Black Raspberry (Rubus occidentalis, L.). This be- 

 comes a troublesome plant in northern parts of the 

 country. The prickly stems inflict annoying scratches. 



Wild Red Raspberry (Rubus idaeus, var. aculeatissimus, 

 (C. A. Mey.) R. and T.). This plant is often abundant 

 in fields of the North ; it may be recognized by its hairy 

 and prickly stems. Often troublesome in the North. 



Dewberry (Rubus villosus, Ait.). This plant grows in 

 dry, open places in northern and western parts of the 

 country. Often troublesome. 



Pulse Family (Leguminosae). Herbs, shrubs, trees or 

 vines with alternate, mostly compound, stipulate leaves, 

 papilionaceous or sometimes regular flowers; calyx three 

 to six or four to five-cleft ; stamens ten, rarely five, and 

 sometimes many, monadelphous, diadelphous or distinct ; 

 pistil, simple, free, becoming a legume in fruit or some- 

 times a loment ; ovules one to many ; seeds generally ex- 



