BRASSIACEAE. 
159 
15. STENOPHRAGMA Celac. 
1. 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 1 cm. long. 
Petals 3-5 mm. long. 1. E. cheiranihoides. 
Petals 8-10 mm. long. 2. E. parvidorum. 
Petals over 1 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. asperiim. 
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. E. Bakeri. 
Plants 1-2 dm. high; stem-leaves entire. 8. E. argillosum. 
Plants low cespitose perennials. 
Leaves entire-margined or nearly so. 9. 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. (E. 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 asperum 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 Canon; 
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’ Canon, above Manitou; Spring Canon; Table Rock; Trinidad; Dixon 
Canon; Howe’s Gulch; Horsetooth Gulch; Rist Canon. 
