60 RHOEODALES 
Stem leafy at least below. 10. Cardamine. 
Steam leafless 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. 
Sheridan County. 
2. Thelypodium. (lodanthus.) 444. 
1. Thelypodium integrifolium (Nutt.) Endl. 
In the western part of the state, mostly in the foothills. Alliance; 
Dawes County; Deuel County; Pine Ridge; Gordon. 
3. Lepidium. 445. 
Stem leaves clasping, base auricled. 1. L. draba. 
Stem leaves neither clasping nor auricled. 
Petals conspicuous, at least equaling the sepals. 
2. L. virginicum. 
Petals minute, or wanting, scarcely more than half as long as the 
sepals. 
Plant branched at the base, petals often present, racemes short 
and dense. 3. L. ramosissimum. 
Plant simple at the base, branched above, racemes elongated. 
4. 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. Lin- 
coln; Wahoo. 
3. Lepidium ramosissimum A. Nels. 
Kearney. 
4. Lepidium apetalum Willd. 
Common all over the state. Callaway; Lincoln; Minden; Red Cloud; 
Thedford, 
4. Thlaspi. 446. 
1. Thlaspi arvense L. 
A rather common weed in the eastern part of the state. Ayr; Bruns- 
wick; Clay Center; Johnson; Lincoln; Plainview. 
5. Sisymbrium. 448. 
Pods less than 2 cm. long, pedicels 2 mm. long, flowers 3 mm. long. 
1. S. officinale. 
Pods 5 cm, long or more, pedicles 6-8 mm. long, flowers 6 mm. broad. 
: 2. S. altissimum. 
1. Sisymbrium officinale (L.) Scop. 
Common in the eastern part of the state. Lincoln; Wahoo. 
