CRUCIFERAE 347 



Flowers white or greenish-white, 4-6 mm. broad ; 

 pods appressed ; style none. 

 Plant not glaucous. 4. A. hirsuta. 



Plant glaucous. 5. A. glabra. 



Pods recurved-spreading. 



Plant glabrous throughout except the earliest 

 basal leaves. 

 Pedicels divergent in flower; petals not 



much longer than the sepals. 6. A. laevigata. 



Pedicels erect in flower; petals much longer 



than the sepals. 7. A. viridis. 



Leaves and lower part of stem hairy. 8. A. canadensis. 



Seeds in 2 distinct rows in each cavity of the pod. 9. A. Drummondii. 



i. A. lyrata L. Rocky and sandy places: Ont. to Va., Tenn., 

 Man. and Mo. 



Throughout the area, except in the pine-barrens, there rare or 

 wanting, most abundant northward. 



2. A. dentata T. & G. Western N. Y. and Pa. to Minn., south 



to Tenn. Mo. and Va. 

 Pa. Luzerne Co. 



3. A. patens Sullivant. In woods: E. Pa. to Minn., Ala. and Mo. 



Pa. Luzerne, Montgomery, Berks, Philadelphia and Chester 



counties. 



A rare and local species whose distribution is little known; in the 

 southern part of the area more common on garnetiferous schists 

 than elsewhere. 



4. A. hirsuta (L.) Scop. In rocky places: N. B. to Br. Col., Ga., 



Ariz, and Cal. Also in Europe and Asia. 



Conn. Rare and local in New London and New Haven counties, 



increasing but never common northwestward. 

 N. Y. The limestone regions of Columbia and Dutchess counties, 



and at Riverdale. 

 N. J. Sussex, Warren, Morris, Passaic and Mercer counties. 

 Pa. Pike, Northampton and Chester counties. 



Tertiary, o: Cretaceous, o: Older Formations, increasing north- 

 ward and most common on limestone. 138-220 days. Sea level- 

 1,400 ft. 



5. A. glabra (L.) Bernh. In fields and rocky places: Que. to 



S. N. Y., Pa., west to the Pacific Coast. Also in Europe and 

 Asia. 



