BRASSIACEAE. 159 



15. STENOPHRAGMA Celac. 



I. Stenophragma virgata (Nutt.) Greene. (Sisymbrium virgatum Nutt.) 

 In dry places in Wyo. and Colo. — Exact locality not given {Hall & Harbour) ; 

 McCoy's, Eagle Co. 



16. ERYSIMUM L. 



Petals less than i cm. long. 



Petals 3-5 mm. long. 1. E. cheiranthoides. 



Petals 8-10 mm. long, 2. E. parvMorum. 



Petals over i cm. long. 

 Petals light yellow. 



Plants biennial or short-lived perennials ; not cespitose. 

 Basal leaves, as well as the whole plant, grayish. 



Pods widely spreading, 5-8 cm. long, stout ; stem-leaves usually sinuate- 

 dentate. 3. E. asperuin. 

 Pods strongly ascending or almost erect, 8-12 cm. long. 



Claws of the petals one-half longer than the sepals ; stem-leaves broadly 



oblanceolate, usually sinuate-dentate. 4. E. elatum. 



Claws of the petals scarcely exceeding the sepals ; stem-leaves entire 

 or nearly so. 

 Stem-leaves linear or nearly so ; pods usually twisted. 



5. E. asperrimum. 

 Stem-leaves oblanceolate ; pods straight. 6. E. oblanceolatum. 



Basal leaves, at least, silvery white ; stem leaves narrowly linear. 

 Plants 2-3 dm. high ; stem-leaves sinuate-dentate. 7. B. Bakeri. 

 Plants 1—2 dm. high ; stem-leaves entire. 8. E. argillosum. 



Plants low cespitose perennials. 



Leaves entire-margined or nearly so. g. E. nivale. 



Leaves sinuate-dentate. 10. E. radicatum. 



Petals varying from orange to dark brown or purple. 



Plant simple, 3-5 dm. high; basal leaves 5-10 cm. long, oblanceolate. 



11. E. Wheeleri. 

 Plant cespitose, 1-2 dm. high ; basal leaves 2-4 cm. long, spatulate. 



12. E. amoenum. 



1. Erysimum cheiranthoides L. In waste places, on river banks and among 

 bushes, from Newf. and Alaska to Tenn. and Utah. — Alt. 4000-9000 ft. — 

 Headwaters of Sangre de Cristo Creek; Middle Park; along the Poudre; 

 Ft. Collins; Grizzly Creek; North Park; New Windsor, Weld Co. 



2. Erysimum parviflorum Nutt. (£. inconspicuum (S.Wats.) MacM.) On 

 hillsides from Minn, and Alb. to Colo, and Nev. — Alt. 5000-8000 ft. — Dix 

 Post Office; Mancos; Durango; Ruxton. 



3. Erysimum asperpm DC. Dry plains and hills, Sask. to Ark. and Colo. 

 — Alt. 4000-9500 ft. — Butte, 5 miles southwest of La Veta; mountains between 

 Sunshine and Ward. 



4. Erysimum elatum Nutt. On hills from N. D., Mont, and Wash, to 

 Colo, and Calif. — Alt. up to 6000 ft. — Foot-hills, Larimer Co. ; Rist Caiion ; 

 Horsetooth Gulch; Quimby; Cucharas River, below La Veta; Horsetooth 

 Gulch; Pike's Peak; Crystal Park; Camp Creek, Larimer Co. 



5. Erysimum asperrimum (Greene) Rydb. (Cheiranthus asperrimus 

 Greene) On hills from S. D. and Mont, to N. M. and Ariz. — Alt. 5000- 

 9000 ft. — Sangre de Cristo Creek; Minnehaha; near Pueblo; Manitou; Wil- 

 liams' Caiion, above Manitou; Spring Canon; Table Rock; Trinidad; Dixon 

 Caiion; Howe's Gulch; Horsetooth Gulch; Rist Caiion. 



