A SFXOND OHIO WEED MANUAL. 



333 



The wild and cultivated blackberries are infested with bramble rust, C&oma 

 nitens (Schw.). This rust destroys cultivated blackberries and raspberries, 

 since the fungus persists in affected stools. The briers also harbor many- 

 insects which prey upon the cultivated sorts. Briers may be destroyed by 

 frequent mowing- and by cultivation. The cutting- seems to be most effective 

 when done late in the summer. 



161 Cinquefoil, Fivefinger (P) Potentilla Canadensis L. Fivefinger, named 

 in allusion to its five leaves (leaflets), forms by its long runners a thick covering 

 on dry and sterile soils. Its bright yellow blossoms are quite show}-. Cinquefoil 

 serves to indicate that the infested lands require enriching and reseeding, 

 possibly liming as well. Shorter rotations with clover and the application of 

 manure or fertilizers will be found useful in those portions of the state where 

 cinquefoil is frequent. Like some other weeds it may be easily smothered out 

 by the growth of forage plants. 



162 Tall Fivefinger (B or P) Potentilla Monspeliensis L. This weed grows 

 one to two feet high, has a hairy stem and leaflets in threes, not in fives as the 

 name indicates. The flowers are small and inconspicuous, while the growth of 

 the root leaves is very dense. 



Seeds light colored, very small, 1-32 of an inch long, nearly circular but with 

 one flattened side. Frequent in timothy seed and seeds of other grasses. The 

 plant is best destroyed by close cutting in spring or early summer or by culti- 

 vation. Mowing with the s:ythe is not sufficient to prevent it from seeding as 

 it sends up shoots anew. 



163 Large=flowered Fivefinger (P) ^Potentilla sulphurea Lam. This plant 

 may be recognized from its larger, pale yellow flowers and deeply toothed 

 leaflets, five to seven in number. Seeds small, coming in grass seeds with in- 

 creasing frequency. Destroyed by cutting with hoe or by cultivation. 



164 Agrimony, Stickseed (P) Agfimcnia hirsuta (Muhl. ) Bickn. The 

 characters of smaller stickseed, which grows one to two feet high, may be seen 



from the illustration, Fig. 29. The leaves are 

 similar to those of the strawberry and rose, 

 with large and small in alternating pairs. 

 The small yellow flowers come in slender clus- 

 ters at the ends of the branches; they are fol- 

 lowed by pear-shaped clusters of prickly-hooked 

 fruits, detrimental to sheep and wool. More 

 frequent in shady places and along ditches. It 

 may be destroyed by careful cutting twice or 

 more times a year. 



165 Soft Agrimony | P | Agrinumia mollis 

 (T. &. G.) Britt., may often be mingled with 

 the preceding. 



166 Small=flowered Agrimony, Stickseed 

 (J*)Agiimoniapari'ijlora Solan. This is a much 

 taller plant, resembling No. 164, but with 



more crowded leaves and smaller yellow flowers; the seeds or fruits are objec- 

 tionable like those of the others. A frequent and persistent weed in low mead- 

 ows and along streams. It requires severer measures than the preceding; 

 more frequent cutting or thorough cultivation as well as draining will usually 

 be needed. 



167 Wild Rose (P) Rosa humilis Marsh. The wild rose is a common 

 intruder in dry banks and by roadsides. This one grows commonly one to two 

 feet high and has very pale petals. In similar situations the sweetbrier, Rosa 

 rubiginosa L., is frequently found. These wild roses are another evidence of 

 too many fence-rows. 



Fig. 



Agrimony. 



[After Millspaugh.) 



