83 PEELIMINAEY CATALOGUE OF PLANTS. 



P. Convolvulus, L. Black Bindweed. Waste and cultivated grounds. 

 Quite common. Nat. Eu. 



P. dumetorum, L. ; Var. scandens, Gray. Damp ground. Common 

 throughout. 



Polygonella, Mich. (Polygonum, L.) . Jointweed. 

 P. articulata, L. Jointweed. Common on the sands of the Yellow 

 Drift, and on the sea-shore. 



Pagopyrum, Tourn Buckwheat. 



P. esculentum, Moench. Buckwheat. Frequent in waste and cul- 

 tivated fields. Adv. Eu. 



Rumex, L Dock. Sorrel. 



R. Patienta, L. Patience Dock. In ballast at Communipaw, A. 

 Brown. Adv. Eu. 



R. orbiculatus, Gray. Great Water-dock. Sparingly in the north- 

 ern counties. Closter, Bergen Co., C. F. Austin ; Budd's Lake, T. C. 

 Porter; Secaucus Swamp, W. H. Leggett; Essex Co., H. H. Eusby. 



R. Brittanica, L. Pale Dock. Bare. Closter, Bergen Co., C. F. 

 Austin ; Haokensack Meadows, W. H. Leggett. 



R. vertioillatus, L. Swamp Dock. Little Snake Hill, W. H. Leg- 

 gett. 



R. crispus, L. Curled Dock. Waste and cultivated fields. Very 

 common throughout. Nat. Eu. 



R. obtusifolius, L. Bitter Dock. Waste and cultivated fields. 

 Quite common throughout. Nat. Eu. 



R. sanguineus, L. Bloody-veined Dock. In ballast at Camden, C. 

 P. Parker. Nat. Eu. 



R. maritimus, L. Golden Dock. In ballast at Hoboken, Addison 

 Brown. Probably grows in many of the salt marshes along the coast 

 but is not reported from any, except those of Ocean and Monmouth 

 Cos., by Dr. P. D. Knieskern. 



R. Acetosella, L. Sheep Sorrel. Old fields and waste places. Com- 

 mon throughout. Nat. Eu. 



PODOSTEMAOBJB. 



Podostemon, Michx Kiver-weed. 



P. ceratophyllus, Michx. Eiver-weed. Sparingly on the bottoms 

 of shallow streams. Passaic Eiver, C. F. Austin; Delaware Eiver 

 above Phillipsburg, T. C. Porter. 



