289] FLORA OF COLUMBIA AND VICINITY I47 



Rocky ravines and hillsides, and on ledges and cliffs; 

 common. 

 Kentucky and Illinois to California; Alabama to Texas. 



179. DESOURAINIA Webb & Berth. [S/SYM- 

 BRIUMU: SOPHIA Adans.]. Tansy mustard. 



450. D. canescens (Nutt.) Prant! [^Sisymbritcm canescens 

 Nutt.: Sophia pinTiata (Walt.) Britton]. 



Common on rocky hillsides, and cliffs. 



Florida to California, northward to the Arctic Circle. 



451. D. intermedia (Rydb.) Daniels {Sophia intermedia 

 Rydb.: Sophia incisa Auct.: Sisymbrium incisum Auct.]. 

 Western tansy mustard. 



Along the railroad near Rocheport. 



Minnesota to British Columbia; Tennessee to Cali- 

 fornia. 



180. ARABIS L. Rock cress. 



452. A. dentata T. & G. Toothed rock cress. 

 Local on ledges and cliffs. 



New York to Minnesota; Virginia to Tennessee and 

 Missouri. 



453. A. Canadensis L. Sickle-pod. 

 Common in rocky woods and thickets. 



New England and Ontario to Minnesota and South 

 Dakota; Georgia to Texas. 



454. A. laevigata (Muhl.) Poir. Smooth rock cress. 

 Common on moist ledges and cliffs. 



Quebec to Minnesota; North Carolina and Georgia to 

 Arkansas. 



Order 22. ROSALES. 

 Family 48. CRASSULACEAE DC. Orpine family. 



181. SEDUM L. Orpine. 



