286 



POLYGONACEAE 



N. Y. S. I., frequent in Bronx, Westchester and Rockland counties. 



N. J. Morris and Sussex counties. 



Pa. Bucks, Northampton and Delaware counties. 



Tertiary, o: Cretaceous, o ; Older Formations not very common. 

 South of the moraine only in Pa. 138-186 days. Sea level-680 ft. 



2. Aristolochia [Tourn.] L. 



1. A. Serpcntaria. 



2. A . Clt-imitilis. 



Calyx tube bent; flowers solitary. 



Calyx tube straight; flowers clustered, axillary. 



1. A. Serpentaria L. In dry woods: Conn, and N. Y. to Mich., 



south to Fla. and La. 



Conn. Rare over most of the state. 



N. Y. Rare and local on L. I. and S. I., apparently wanting south 



of the moraine on L. I.; thence increasing, but not very common, 



northward to Putnam Co.; not known northward. 

 N. J. Very rare in Cape May Co., increasing but rare northward; 



rare or wanting in the pine-barrens. 

 Pa. Northampton, Delaware, Berks and Chester counties. 



Tertiary, 0: Cretaceous, not common: Older Formations, more 

 common. 162-210 days. Sea level-680 ft. 



2. A. Clematitis L. Near Ithaca and Flushing, N. Y., and E. Pa. 



An escape from cultivation. Native of Europe. 



A rare and perhaps doubtfully established escape. 

 A. macrophylla Lam., is an occasional escape. 



POLYGONACEAE 



Stigmas tufted; calyx 6-parted. 

 Stigmas capitate. 



Internodes not adnate; plants not heath-like. 



Leaf-blades jointed at the base; ochreae 2-lobed; filaments 



dilated. 

 Leaf-blades not jointed at the base; ochreae not 2-lobed; 

 filaments slender. 

 Ochreae cylindric, truncate. 



Sepals 4; calyx curved; stamens 4. 

 Sepals mostly 5; calyx straight. 

 Ochreae oblique, partly open on one side. 

 Sepals neither keeled nor winged. 



Racemes corymbed; plants smooth. 

 Racemes not corymbed; plants prickly. 

 Sepals, at least the outer, keeled or winged. 

 Stigmas capitate; styles erect or none. 

 Stigmas dilated, toothed; styles divaricate. 

 Internodes adnate; plants heath-like. 



1. Rumex. 



2. Polygonum. 



3. TOVARA. 



4. Persicaria. 



5. Fagopyrum. 



6. Tracaulon. 



7. Tiniaria. 



8. Pleuropterys. 



9. Polygonella. 



