DESCRIPTIONS OF SOME COMMON WEEDS 



with claws, stamens six ; pod oblong to linear, one to two 

 inches long, the stipe as long as the pedicel ; seeds reni- 

 form, embryo coiled. From Iowa and Minnesota to the 

 Rocky Mountains, New Mexico, Arizona, and Manitoba. 



Rose Family (Rosaceae). Herbs, shrubs or trees, 

 leaves regular, flowers alternate or some opposite ; 

 stamens generally numerous, stipulate frequently falling 

 soon after the leaves appear, 

 distinct, inserted on the calyx; 

 petals as many as the sepals or 

 rarely wanting; pistils one to 

 many, generally distinct, ex- 

 cept in Pomeae, where the pistil 

 is united to the calyx; fruit 

 various; achenes, follicles, 

 drupes, or pomes, as in the ap- 

 ple ; seeds one to many, without 

 albumen ; embryo straight, 

 with large cotyledons. The 

 order contains about 90 genera 

 and 1,500 species of wide dis- 

 tribution ; in temperate and 

 tropical regions, some boreal. 

 But few of the plants are nox- 

 ious or have noxious quali- 

 ties. 



Common Five-finger (Poten- 

 tilla monspeliensis, L.). A stout, erect biennial, one-half 

 to two feet high, with ternate leaves, obovate or oblong- 

 lanceolate leaflets; flowers yellow, in cymose clusters; 

 calyx flat, deeply five-cleft, with as many bracts interven- 

 ing; petals five, roundish; seed small, yellowish, longi- 

 tudinally furrowed, sometimes reflexed. Probably intro- 

 duced from Europe, though it may have been indigenous. 

 It is now found growing in dry or wet soil from New 

 England to the Rocky Mountains and Utah. 



Fig. 1 1 8. 

 serrulata). 



Stmk\veed(Cleome 

 (Ada Hayden). 



