22 CRUCIFER^E. (MUSTARD FAMILY.) 



8. STANLEYA, Nutt. 



Sepals narrow, spreading, yellow. Petals with long connivent claws. Fila- 

 ments much elongated. Stout perennials with large flowers in elongated 

 racemes. 



1. S. pinnatifida, Nutt. Stems 2 to 3 feet high, decumbent at base: 

 lower leaves lyrate-pinnatijid ; upper leaves entire, lanceolate, narrowed at base 

 to a slender petiole : pods somewhat torulose, twice longer than the stipe. 

 S. mtegrifolia, James. From Arizona and New Mexico to the head-waters of 

 the Missouri, eastward to Western Iowa, and westward to California. 



2. S. tomentosa, Parry. Stems 1 to 3 feet high, very stout, white-villous 

 or hirsute throughout: radical and lower leaves as in the last; upper ones 

 entire and hastate, passing into lanceolate and finally subulate bracts : raceme 

 very dense and thick, cylindrical, becoming 1 to 1^ feet long, with pale cream- 

 colored flowers. Am. Naturalist, viii. 212. " Owl Creek, Wyoming, on dry 

 slopes," Parry. 



3. S Viridiflora, Nutt. Stems 2 to 4 feet high, simple, erect, glabrous : 

 radical leaves obovate or lanceolate, entire or with a few runcinate teeth towards 

 the base ; cauliue lanceolate, clasping : sepals and petals greenish-yellow : pods 

 torulose. N. Nevada, Utah, Wyoming, and northward. 



9. ERYSIMUM, L. 



Sepals erect, the alternate ones strongly gibbous at base. Petals long- 

 clawed, with a flat blade. Leaves not clasping ; the flowers often large, 

 yellow or orange, or occasionally purple. 



* Flowers small : pods small and short. 



1. E. cheiranthoides, L. Minutely roughish, slender, branching: 

 leaves lanceolate, scarcely toothed : pods very obtusely angled, ascending 

 on slender divergent pedicels. From Colorado to Arctic America and 

 westward. ' 



* * Flowers showjj : pods elongated. 



2. E. asperum, DC. Canescent with short oppressed hairs: stems soli- 

 tary and simple, rarely branched above : leaves oUanceolate or narrowly spatu- 

 late ; the cauline linear to linear-lanceolate, entire or sparingly repand : petals 

 light yellow to deep orange or purple : pods ascending on stout spreading pedicels. 

 From Mexico to British America, and from California to Texas arid Ohio. 



Var. Arkansanum, Gray. Minutely roughish-hoary : leaves lanceolate, 

 somewhat toothed : pods nearly erect on very short pedicels, exactly 4-sided. 

 On the plains and in the mountains of Colorado and eastward. 



3. E. pumillim, Nutt. Somewhat scabrous: stems 2 to 4 inches high: 

 leaves linear, all entire : flowers pale yellow : pods flatly 4-sided, very long, 

 erect, on very short pedicels. E. asperum, var. pumilum, and Hesperis Pallasii 

 of Fl. Colorado. Alpine in Colorado, also in the foothills of Nevada. 



4. E. parviflorum, Nutt. Canescent and scabrous : stem low and simple : 

 leaves all linear or somewhat lanceolate, almost wholly entire, densely clustered 

 at the base of the stem : flowers small, sulphur-yellow : pods erect. E. asperum, 

 var. inconspicuum, of Bot. King's Exp. 24 and Bot. Calif, i. 39. Nevada to the 

 Saskatchewan. 



