214 
IOWA ACADEMY OF SCIENCES. 
Roripa. 
•299. B. palustris (L.) Bess. (Nasturtium yalustre DC.). 
Abundant in swampy ground and wet fields. 
300. R, nasturtium (L.) Rusby. {N, officinale R. Br.) 
In springs; infrequent. 
301. jR. jarmoracia (L.) Hitch. (iV. armoracia R. Br.) 
Frequently escaped. 
Cardaminb. 
302. C . pennsylvanica Muhl . Common along streams 
and in low ground. 
303. C. hulhosa (Schreb.) B. S. P. (C. rhomhoidea 
DC.) Abundant in wet meadows and along 
streams. 
Dentaria . 
304. D. laciniata Muhl. Common in rich woods. 
Bursa. ■ 
305. B. hursa pastor is (L,') Brit. {Capsella bursa pas- 
tor is Moench.) Abundant. 
Draba. 
306. D. caroliniana Walt. Dry and sandy waste places. 
Sophia. 
307. S. incisa (Engl.) Greene. Dry ground, especially 
along railroads; common. 
Arabis. 
308. A. dentata T. & G. Wooded ravines; frequent. 
309. A. hirsuta (L.) Scop. Dry, stony ground; common. 
310. A, laevigata (Muhl.) Poir. Dry rocks of river 
banks; infrequent. 
311. A, canadensis L. Dry woods; frequent. 
312. A. glabra (L.)l^Qnt\i. {A . pe^foliata Along 
railroads; scarce. 
Erysimum. 
313. E. cheirauthoides L. On dry rocks of river banks; 
frequent. 
