152 CRUCIFERAE [Vox.. II, 



3. Erysimum syrticolum Sheldon. Sand Erysimura. (Fig. 1785.) 



Erysimum syrticolum Sheldon, Bull. Torr. 

 Club, 20: 285. 1893. 



Similar to the preceding species and per- 

 haps a form of it, but pale and finely ap- 

 pressed-canescent, the stems stiff, erect or 

 assurgent, branched near the base or simple, 

 i-2^ tall. Leaves firm, linear-lanceolate, 

 entire or sparingly denticulate, i / -2 / long, 

 early falling away; flowers 3"-4" high; 

 stigma conspicuously 2-lobed; style less than 

 i" long; pods linear, rather stout, 9"-! 8" 

 long, nearly i" thick, erect or nearly so on 

 ascending pedicels 2#"-4" long; seeds ob- 

 long, %" long. 



On dry sandy banks, Minnesota to the North- 

 west Territory. July-Aug. 



4. Erysimum &sperum DC. Western Wall-flower. Yellow Phlox. 



(Fig. 1786.) 



Erysimum lanceolatum Pursh, Fl- 

 Am. Sept. 436. 1814. NotR. Br. 1812- 



Erysimum asperum DC. Syst. a: 505. 

 1821. 



Erysimum Arkansanum Nutt. ; T. & 

 6. Fl. N. A. i: 95. 1838. 



Rough-pubescent or hoary, 1-$* 

 high, simple or branching above. 

 Lower leaves lanceolate or linear, 

 tapering into a petiole, dentate or 

 sometimes entire, mainly acute; 

 upper leaves smaller, sessile or 

 nearly so, entire or rarely toothed; 

 flowers orange-yellow, large and 

 showy, 6 // -i2 // high and nearly as 

 broad; pedicels stout, spreading, 

 2 // -3 // long in fruit; pods linear, 

 rough, i #'-4' long, nearly \" wide, 

 4-sided; style short, thick. 



In open places, Ohio and Illinois to 

 Texas and the Saskatchewan region, 

 west to the Pacific Coast. The eastern 

 plant (E. Arkansanum Nutt.) gener- 

 ally has broader leaves than the west- 

 ern. Also in eastern Quebec, prob- 

 ably cdventive. May-July. 



34. ALYSSUM L. Sp. PI. 650. 1753. 



Low branching stellate pubescent annual or perennial herbs, with small racemose yellow 

 or yellowish flowers. Petals entire. Filaments often dilated and toothed or appendaged. 

 Silicic ovate, oblong or orbicular, compressed, its valves nerveless, the septum thin. Stigma 

 nearly entire. Seeds 1-8 in each cell of the pod, wingless; cotyledons accumbent. [Greek, 

 curing madness.] 



A genus of about 100 species, natives of the Old World, some of them known as Madwort. 



