94 Annai.s of thk Carnegie Museum. 



f R. verticillatus Linnaius. Swamj) dock. 



* R. crispus Linn?eus. Curled dock. 



* R. obtusifolius Linn;eus. Hitter dock. 



f R. conglomeratus Murray. Smaller green dock. 



-\ R. sanguineus Linnjeus. Red veined dock. 



POLYGONUM Linnceus. 

 ? P. maritimum Linnreus. Seaside knotweed. 



* P, aviculare Linnaiu.s. Door-weed. 



* P. erectum Linnteus. Erect knotweed. 



* P. ramosissimum Michaux. lUishy knotweed. 



Allegheny R. R. near outer depot, 1886, Dr. A. Ziegler. 



t P. incarnatum Elliott. Slender yjink persicaria. 



* P. Pennsylvanicum Linnneus. Pennsylvania persicaria. 



* P. orientale Linnaeus. Prince's feather. 



* P. Persicaria Linnaeus. Lady's thumb. 



* P. hydropiperoides Michaux. Mild waterpepper. 



* P. Hydropiper Linncxus. Smart-weed. 



'■> P. punctatum Elliott. Water smart-weed. 

 /'. <ji/r liuniholdt, Bonpland ..V' Kunth. 



