CRUCIFERAE 341 



1. R. Raphanistrum L. In fields and waste places: Ont. and 



N. B. to Pa.; also in B. Col. Naturalized from Europe. 



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

 rare or wanting. 



2. R. sativus L. Cultivated and occasionally spontaneous for a 



year or two: E. N. Am. Native of Asia. 

 A rather uncommon and fleeting escape. 



12. Barbarea R. Br. 



Pods obtusely 4-angled, slender-pedicelled; leaf-segments 1-4 pairs. 



Pods divergent or ascending. I. B. Barbarea. 



Pods erect, appressed. 2. B. stricta. 



Pods sharply 4-angled, stout-pedicelled; leaf-segments 4-8 pairs. 3. B. verna. 



i. B. Barbarea (L.) MacM. In fields and waste places: Lab. to 

 Va. and locally in the interior. Also on the Pacific Coast. 

 Naturalized from Europe. 



Common as a weed throughout the area. 



2. B. stricta Andrz. In fields and waste places: Que. to Minn., 



the N. W. Terr., Fla., Neb. Naturalized from Europe. 

 Not so common as the preceding, with a similar range in our area. 



3. B. verna (Mill.) Aschers. (B. praecox (J. E. Smith) R. Br.). In 



waste places: Conn, to Fla. Adventive from Europe. 



Rare in most parts of our area, except the pine-barrens, there 

 perhaps wanting; not definitely known from the Catskills. 



13. Radicula Hill (Roripa Scop.). 



Plant perennial by creeping or subterranean branches. I. R. sylvestris. 

 Plant annual or perennial, with fibrous roots. 



Stem nearly or quite glabrous; pods linear or linear-oblong. 2. R. palustris. 



Stem hispid-pubescent ; pods globose or oval. 3. R. hispida. 



1. R. sylvestris (L.) Druce. In low grounds and waste places: 



Newf. to Mass., Va. and Mich. Adventive or naturalized 

 from Europe. 



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

 wanting. 



2. R. palustris (L.) Bess. In wet places: nearly throughout N. 



Am., except the extreme north. Apparently naturalized 

 from Europe. 



