70 Order RHOEODALES 
Pubescence of forked hairs, leaves all pinnately dis- 
sected. 17. Sophia. 
Pods 4-angled. 
Stem leaves clasping by a cordate base. 21. Conringia. 
Stem leaves not clasping. 
Seeds plump; leaf-blades entire or toothed. 
19. Erysimum. 
Seeds flat; leaf-blades pinnatifid. 8. Barbarea. 
Pods with a long, distinct beak. 
Beak flat, sword-like, usually with a seed in its base. 
6. Sinapis. 
Beak conic or 4-angled, seedless. 4, Brassica. 
b. Pods flattened parallel to the broad partition. 
Pods orbicular, with flattened, wing-like margins. 20. Alyssum. 
Pods not wing margined, rarely orbicular. 
Valves of the pod nerveless. 
Seeds in two rows; pods usually short. 16. Draba. 
Seeds in one row; pods long. 
Stem leafy at least below. 10. Cardamine. 
Stem leafiess below, 2-4 leaved above. 11. Dentaria. 
Valves nerved and reticulated. 
Pods short, orbicular to linear-oblong. 16. Draba. 
Pods elongated, linear. 18. Arabis. 
1. Stanleya. 444. 
1. Stanleya pinnata (Pursh) Britton. 
In the western part of the state. Culbertson; McCook; Sheridan 
county. 
2. Thelypodium (Iodanthus). 444. 
1. Thelypodium integrifolium (Nutt.) Endl. 
In the western part of the state, mostly in the foot-hills. Alliance; 
Dawes county; Deuel county; Gordon; Pine Ridge. 
3. Lepidium. 445. 
Peppergrasses. 
Stem leaves clasping, base auricled; perennials. 1. L. draba. 
Stem leaves neither clasping nor auricled; annuals. 
Petals conspicuous, at least equalling the sepals. 2. L. virginicum. 
Petals minute, or wanting, rarely more than half as long as the 
sepals. 3. L. apetalum., 
1. Lepidium draba L. 
Introduced in the eastern part of the state, but still rare. Lincoln; 
Wymore. 
2. Lepidium virginicum L. 
Common in the eastern part of the state, less so in the western. 
Lincoln; Wahoo. 
3. Lepidium apetalum Willd. 
Common all over the state. Callaway; Kearney; Minden; Red Cloud; 
Thedford. 
4. Thlaspi. 446. 
1. Thlaspi arvense L. Penny Cress, French-weed. 
A rather common weed in the eastern part of the state. Ayr: 
