Polygonacece. 
95 
Polygonacece. (Buckwheat Family.) 
Rumex, L. Dock. Sorrel. 
473. R. Brittannica , L. Great water-dock. 
Growing in shallow water at margins of lakes and 
streams. 
474. R. altissimus, Wood. Pale dock. 
In marshes about the lakes. Common. 
475. R. verticillatus, L. Swamp dock. 
With R. altissimus. Not common. 
476. **R. crispus, L. Curled dock. 
A weed in cultivated land. 
477. **R. obtusifolius, L. Bitter dock. 
With R. crispus. More abundant. 
478. R. acetosella, L. Field or sheep sorreh 
Abundant along railroads and on sandy soil. 
Polygonum, Tourn. Knotweed. 
479. *P. aviculare , L. 
Common in yards and along roadsides. 
480. P. erectum , L. 
With P. aviculare. Less abundant. 
481. P. Pennsylvanicum , L. 
In low wet places. Common. 
482. *P. amphibium , L. 
In shallow water. Local. 
483. P. Muhlenbergii , Watson. 
Growing in muddy places. Not common. 
484. P. Hartwrightii, Gray. 
In muddy places. Rare. 
485. P. orientale, L. Prince’s feather. 
Occasionally escaped from cultivation. 
486. *P. Persicaria, L. Lady’s thumb. 
Common in waste grounds and .along roadsides. 
487. *P. liydropiperoides , Michx. Mild water-pepper. 
Low wet pastures and cultivated land. Common. 
488. *jP. Hydropiper , L. Common smartweed or water- 
pepper. 
Very abundant in cultivated fields. 
