POLYGONACEAE 



291 



3. Tovara Adans. 

 1. T. virginiana (L.) Raf. (Polygonum virginianumh.) In woods: 

 N. S. to Minn., south to Fla. and Tex. 



Common throughout the range except in the pine-barrens of N. J. 

 and the coastal plain of L. I. 



4. Persicaria [Tourn.] Mill. 



Racemes solitary or 2; aquatic or swamp species; peren- 

 nials. 

 Leaves oblong, elliptic or elliptic-lanceolate, not 



acuminate. 

 Leaves ovate or oblong lanceolate, usually acuminate. 

 Racemes several or numerous; annuals or perennials, 

 mostly terrestrial. 

 Ocreae naked or ciliolate, their limbs not spreading. 

 Racemes drooping. 

 Racemes erect. 



Annual; achene concave-orbicular. 

 Perennial; achene biconvex, broadly oblong. 

 Ocreae fringed with bristles, their limbs not spreading. 

 Sepals not glandular punctate. 

 Racemes not interrupted. 

 Racemes erect. 

 Raceme drooping. 

 Raceme interrupted. 



Ocreae strigose, fine bristly. 



Calyx greenish-white; ocreae co- 

 piously long bristly. 

 Calyx white, pink or purplish-pink; 

 ocrtae sparingly fine-bristly. 

 Ocreae hirsute or appressed hirsute. 

 Sepals glandular punctate. 



Achene granular and dull; racemes drooping. 

 Achene smooth, shining; racemes erect. 

 Ocreae fringed with bristles, their limbs normally 

 spreading. 



1. P. amphibia. 



2. P. Muhlenbergii. 



3. P. lapathifalta. 



4. P. pennsylvanica. 



5. P. portoricensis. 



6. P. Persicaria. 



7. P. Careyi. 



8. P. opelousana. 



9. P. hydro pi peroides. 



10. P. setacea. 



11. P. Hydropiper. 



12. P. punctata. 



13. P. orientaKs, 



i. P. amphibia (L.) S. F. Gray (Polygonum Hartwrightii A. 

 Gray*). In water or in swamps: Que. to Alaska, south to N. J., 

 Pa., Kan. and S. Cal. Also in Eu. 



Conn. Rare and local over most of the state, increasing north- 

 westward. 

 N. Y. Rare and local on the north of L. I. and on S. I. in- 

 creasing up the Hudson Valley, but nowhere very common. 

 N. J. Morris, Sussex and Hunterdon counties. 



* See Coulter, Barnes and Cowles Textbook of Botany. 2- Ecology, 574. 191 1. 



