CALLITRICHACEAE 427 



4. T. Darlingtonii (A. Gray) Small (E. Darlingtonii A. Gray). 



N. Y., Pa. and N. J. to N. Car. 



Known in our area only from Gloucester Co., N. J. and Chester 

 Co., Pa., there very rare. Distribution insufficiently understood. 



5. T. Esula (L.) Hill (E. Esula L.). In waste places: Mass. to 



N. Y. and Mich. Naturalized from Europe. 



Very rare in our area as a weed. Collected at Redding, Conn., in 

 1902. 



6. T. Cyparissias (L.) Hill (E. Cyparissias L.). Escaped from 



gardens to waste places: N. Eng. to Kan. Naturalized from 

 Europe. 



Common throughout the region except in the pine-barrens, there 

 rare or wanting. 



Tithymalus segetalis (L.) Lam. has been collected as a waif. 



Mercurialis annua L. has also been collected on ballast, but is apparently fugitive. 



Croton capilatus Michx. was reported from Monmouth Co., N. J. many years ago. 

 There are no specimens extant and the record is doubtful. It has recently been col- 

 lected as a waif on S. I. 



CALLITRICHACEAE 

 1. Callitriche L.* 



Fruit short peduncled; bracts wanting; terrestrial. 1. C. Austini. 

 Fruit sessile; aquatic or mud inhabiting herbs. 



Fruit oval, longer than the styles. 2. C. paluslris. 



Fruit obovate, shorter than the styles. 3. C. heterophylla. 



1. C. Austini Engelm. In damp shaded places: Conn, to N. J., 



Ohio, Mo., Tenn., Tex. and Mex. 



Conn. Not common but generally distributed except in coastal 



New London Co., there not reported. 

 N. Y. Reported from S. I. but not otherwise known from the area. 

 N. J. Rare and local in Passaic, Bergen, Mercer, Middlesex 



and Salem counties. 

 Pa. Bucks and Monroe counties. 



A rare and local plant whose scattered distribution is little under- 

 stood. 



2. C. palustris L. Mostly in cold or running water: throughout 



Can. and U. S. 



Conn. Not uncommon westward along the coast; rare or wanting 

 elsewhere. 

 * See footnote, page 76. 



