MICHIGAN WEEDS. 



309 



Fig. 37 (37). 



Lady's Thumb. Polygonum Persicdria L. Annual, usually smooth, much branched 

 unless crowded, 15-60 cm. high; leaves lanceolate, roughish, often marked by a dark- 

 triangular or moon-shaped spot near the middle, giung rise to the common name: 

 racemes dense, 2-3 cm. long; calyx pink to dark purple; achenes smooth, shining, usually 

 flattened, 2-3 mm. long. Fields and waste placesvery common. Introduced from 

 Europe and widely distributed. 



