OF WESTCHESTER COUNTY. 807 



Acnida, L. (Water Hemp.) 

 A. cannabina, L. 



Order 87— P0LYG0NACE2E. (Buckwheat Family.) 



Polygonum, L. (Knotweed.) 



P. orientale, L. About dwellings. (Adv. India.) 



P. Careyi, Olney. (Bicknell.) 



P. Pennsylvanicum, L. Damp waste places. 



P. incarnatum, Ell. (Bicknell.) 



P. Persicaria, L. Waste places ; Commom. 



P. Hydropiper, L. Moist grounds. 



P. acre, H. B. K. Wet grounds, common. 



P. hydropiperoides, Mx. Wet places. 



P. amphibium, L. Water and very wet places. 



P. Virginicum, L. Thickets and road-sides. 



P. aviculare, L. 



Var. erectum, Roth. About dwellings with the last, but larger. 



P. maritimum, L. Coast of Long Island Sound. 



P. tenue, Mx. Dry soil. 



P. arifolium, L. Wet grounds. 



P. sagittatum, L. Damp grounds. 



P. Convolvulus, L. Cultivated fields. (Nat. Eu.) 



P. cilinode, Mx. Rocks and thickets, 



P. dumetorum, L. Damp places. 



Var. scandens, Gray. Thickets. 



i 



Fagopyrum, Tourn. (Buckwheat.) 



P. esculentum, Mcench. Escaped from cultivation. (Adv. Eu.) 



Eumex, L. Dock. (Sorrel.) 



R. Britannica, L. Damp grounds. 



R. crispus, L. (Curled Dock.) Common in grass fields, used for greens, a 

 troublesome weed. (Nat. Eu.) 



R. obtusifolius, L. 



R. Acetosella, L. (Horse Sorrel. Field Sorrel.) Troublesome weed in old 

 fields. (Nat. Eu.) 



Order 88.— LAUEAGEJE. (Laurel Family.) 



Sassafras, Nees. 



S. officinale, Nees. Second-class tree in woods. 



Lindera, Thunberg. (Wild Allspice. Spice-wood.) 

 L. Benzoin, Meisner. Shady woods. 



