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-pinnatljid ; upper leaves entire, lanceolate, narrowed at base 

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

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

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



2. S. tomcntosa, 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 ruucinate teeth towards 

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

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



9. ERYSIMTJM, 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 showy : pods elongated. 



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

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

 late ; the caulilie 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 and 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. pumilum, 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 Hcspei-is 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. 



