PLANTS OF IOWA 173 



SOPHIA, Adams. 



2229. 8. sophia, (L.) Britton. Flixweed. 

 In waste places. 



2230. 8. pinnata, (Walt.) Britton. Tansy Mustard. 

 In dry soil. 



2231. 8. intermedia, Rydb. Western Tansy Mustard. 

 In dry soil. 



2232. 8. thaliana, (L.) Celak. Mouse Ear Cress. 

 In sandy soil. 



ARABIS, L. 



2233. A. lyrata, L. Lyre-leaved Rock-cress. 

 On rocks. 



2234. A. dentata, T. & G. Toothed Rock-cress. 

 In rocky places. 



2235. A. hisuta, (L.) Scop. Hairy Rock-cress. 

 In rocky places. 



2236. A. Icevigata, (Muhl.) Poir. Smooth Rock-cress. 

 On rocky slopes. 



2237. A. canadensis, L. Sickle-pod. 

 In woods. 



2238. A. brachycarpa, (T. & C.) Britt. Purple Rock-cress. 

 In rocky places. 



2239. A. gldbra, (L.) Bernh. Tower Mustard, 

 Rocky places. 



ERYSIMUM, L. 



2240. E. cheiranthoides, L. Worm-seed Mustard. 

 Along borders and on banks ; not rare. 



BERTEROA, DC. 



2241. B. incana, (L.) DC. Hoary Alyssum. 

 Not common. 



HESPERIS, L. 



2242. H. matronolis, L. Dame 's Rocket. 

 Fields and roadsides, from Europe. 



