POLYGONACEAE 293 



Pa. Carbon and Monroe counties. 



A rare and local species whose distributional tendencies are not 

 satisfactorily known. 



8. P. opelousana (Riddell) Small. In wet soil: Mass. and Mo. 



to La., Tex. and Mex. 



N. Y. On L. I., S. I. and at Van Cortlandt Park. 



N. J. Along the coast and at Delanco. 



9. P. hydropiperoides (Michx.) Small. In swamps and wet soil: 



N. B. to Minn, and Cal., south to Fla. and Mex. 



Common throughout the range, except in the pine-barrens of 

 L. I. and N.J. there rare and perhaps wanting as a wild plant. 



10. P. setacea (Baldw.) Small. In swamps: Mass. and Mo., La. 



and Fla. 



N. J. Cape May Co. 



11. P. Hydropiper (L.) Opiz. In moist places: nearly throughout 



N. Am. Naturalized from Europe. 

 Throughout the range, often becoming a weed. 



12. P. punctata (Ell.) Small (P. punctatum robustior Small, P. 



robustior (Small) Bicknell). In swamps and wet places: 

 nearly throughout N. Am. 



Common throughout the range in some of its forms. 



13. P. orientalis (L.) Spach. In waste places, escaped from 



gardens: throughout eastern N. Am. Native of India. 

 Locally common near cities and gardens. 



5. Fagopyrum Gaertn. 

 1. F. Fagopyrum (L.) Karst. Fields and roadsides: nearly 

 throughout the northern U. S. and southern Canada. Native 

 of Temperate Old World. 



Not a very common escape in most parts of our range. 

 F. tataricum (L.) Gaertn. has been reported as an occasional waif. 



6. Tracaulon Raf. 



Leaves sagittate; achenes 3-angled. I. T. sagittatum. 



Leaves halberd-shaped; achene lenticular. 2. T. arifoliiim. 



I. T. sagittatum (L.) Small {Polygonum sagittatum L.). In wet soil: 

 Newf. and N. S. to the N. W. Terr., south to Fla. and Kan. 

 Common throughout our range, except the pine-barrens. 



