230 PHANEROGAMOUS PLANTS. 



9. SISYMBRIUM, Allioni. 



1. Sisymbrium Sophia, Linn., vars. 



Hab. On the Upper Columbia River. — [Two forms; one clearly 

 belonging to S. incisum, Engelm. ; the other, with pedicels only twice 

 the length of the calyx and only half as long as the pod, would ap- 

 pear to be Founder's S. Hartwegianum.~\ 



2. Sisymbrium Thaliana, Gay. 



Hab. Dry prairies between Fort Okanagan and Grand Coulee. — 

 Probably indigenous to the region. 



10. ERYSIMUM, Linn. 



1. Erysimum cheiranthoides, Linn. 

 Hab. Interior of Oregon. — Evidently an indigenous species. 



2. Erysimum asperum, DC. 



Hab. Puget Sound, and prairies in the interior of Washington Ter- 

 ritory. [E. lanceolatum, Pursh.] 



3. Erysimum retrofractum, Sp. Nov. 



K glabrum, elatum ; foliis inferioribus lyratis, superioribus oblongo- 

 lanceolatis remote runcinato-dentatis ; floribiis minutis ; siliquis longe 

 raeemosis brevi-pedicellatis reflexis acutis. 



Hab. Between the Cascade Mountains and Fort Nisqually; rare. — 

 A remarkable species, easily distinguished by its smoothness and 

 reflexed siliques. The stem is 3 or 4 feet high. The leaves with a 

 long tapering point ; lower cauline ones 2 or 3 inches long. Flowers 



