AMMIACEAE 479 



thence unrecorded to Mercer and Middlesex counties, thence in- 

 creasing northward ; not in the pine-barrens. 



Pa. Luzerne, Monroe, Northampton, Bucks and Philadelphia 

 counties. 

 Tertiary, o : Cretaceous, very rare in the region of glacial terraces : 



Older Formations, increasing northward. 117-204 days. Sea 



level-3,365 ft. 



11. Deringa Adans. 



1. D. canadensis (L.) Kuntze. In woods: N. B. to S. Dak., Ga. 

 and Tex. 



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

 in the region just east of them, there unrecorded; rare in the region 

 west of the pine-barrens from Camden, Co., N. J. southward; and 

 on the coastal plain of L. I. 



12. Taenidia Drude. 



1. T. integerrima (L.) Drude. In rocky or sandy soil: Que. to 

 N. Car., Ont., Minn., Kan. and Miss. 

 Conn. New Haven and Fairfield counties near the coast. 

 N. Y. Hempstead Plains and at Flushing, L. I.; unknown on 



S. I.; rare in the Bronx, thence increasing northward. 

 N. J. Reported but not definitely known from northern Ocean 



and Monmouth counties; rare in Middlesex Co., thence increasing 



northward. 

 Pa. Northampton, Bucks, Montgomery and Chester counties. 



Tertiary, 0: Cretaceous, very rare or wanting: Older Formations 

 increasing but never very common northward. 117-220 days. 

 Sea level-3,365 ft. 



13. Sium [Tourn.] L. 



1. S. cicutaefolium Gmel. In sw r amps: N. S. to B. Col., Fla., 

 La. and Cal. 



Throughout the range except in the pine-barrens, there un- 

 recorded. 



A weak, usually aquatic, form of this species has been described as 5. Carsoni Durand. 

 I am unable to maintain it as a species, at least so far as local plants are concerned. 



14. Ptilimnium Raf. 



1. P. capillaceum (Michx.) Raf. In wet soil, especially in 

 brackish marshes: Mass. to Fla., west to Tex. 



