82 PKELIMINARY CATALOGUE OF PLANTS. 



POLYGONACE^l. 



Polygonum, L Knotweed. 



P. orientale, L. Prince's Feather. Waste places, frequent. Very 

 abundant on river-dredgings at Camden, I. C. Martindale. Adv. 

 India. 



P. Careyi, Olney. Carey's Knotweed. Margin of a swamp between 

 Tenafly and Cresskill, 1858, C. F. Austin; Tom's River, T. C. Porter; 

 Ocean Grove, Monmouth Co., near Winslow, Camden Co., Egg Harbor 

 City and Manchester, Ocean Co., C. F. Parker. 



P. Pennsylvanicum, L. Knotweed. Moist open places. Common 

 throughout. 



P. incarnatum, Ell. Borders of ponds. Apparently quite scarce. 

 In ballast at Camden, C. F. Parker 



P. lapathifolium, Ait., and Var. incanum, Gray. In ballast at Cam- 

 den, C. F. Parker. 



P. Persicaria, L. Lady's Thumb. Damp waste places. Common 

 throughout. Nat. Eu. 



P. Hydropiper, L. Water-pepper. Wet places. Rather common 

 throughout. 



P. acre, H. B. K. Water Smartweed. Wet places. Common 

 throughout. 



P. hydropiperoides, Michx. Mild Water-pepper. Wet places. 

 Common throughout. 



P. amphibium, L. ; Var. aquaticum, Willd. Sparingly in wet places 

 throughout the northern and middle counties. 



Var. terrestre, Willd. Closter, Bergen Co., C. F. Austin. 



P. Virginianum, L. Woods and thickets. Rather common except 

 in the pine barrens. 



P. aviculare, L. Knotgrass. Door-weed. Very common in yards 

 and waste places, and along roadsides in all parts of the State. 



P. erectum, L. (P. aviculare, L. ; Var. erectum, Gray.) Erect 

 Knotgrass. Waste places. Common throughout. 



P. maritimum, L. Coast Knotgrass. Frequent in sands of the sea- 

 shore. 



P. tenue, Michx. Rocky hills, northern and middle counties. 

 Closter, Bergen Co., C. F. Austin; Plainfield, Frank Tweedy; Prince- 

 ton, 0. R. Willis ; Palisades, N. L. Britton ; First Mt., Essex Co., H. 

 H. Rusby ; also at Keyport, Monmouth Co., R. W. Brown. 



P. arifolium, L. Halberd-leaved Tear-thumb. Low grounds. Com- 

 mon throughout. 



P. sagittatum, L. Arrow-leaved Tear-thumb. Low grounds. Com- 

 mon throughout. 



