308 



EXPERIMENT STATION BULLETIN. 



Fig. 35 (36). 



Pennsylvania Persicaria. Polygonum 

 pennsylvanicum L. Annual, smooth below, 

 erect, simple or branched, 30-90 cm. high; 

 peduncles and pedicels glandular; leaves lanceo- 

 late; racemes 2-4 cm. long; flowers bright rose- 

 color; achenes flattened, nearly circular, jet 

 black, about 3 mm. long. Moist soil; native 

 to this country, Canada and the eastern United 

 States. 



Fig. 36 (35). 



Pale- Persicaria Polygonum lapathifoliwn 



L. Annual, smooth, the pedicels glandular, 

 branching, 60-240 cm. high; leaves lanceolate, 

 4-20 cm. long; spikes slender, rather dense, 

 drooping, 1-5 cm. long, achenes flattened, 

 shining; wet places, common, very variable, 

 throughout temperate North America. In- 

 troduced from Europe. 



