164 
BRASSIACEAE. 
Plant perfectly glabrous ; beak of the pod less than i mm. long. 
4. C. pennsylvanica. 
Plant more or less hairy, at least on the lower part of the stem or the base of 
the petioles ; beak of the pod over 1 mm. long. 5. C. acuminata. 
1. Cardamine cordifolia A. Gray. In brooks and on shady banks from Wyo. 
to N. M. and Ariz.—Alt. 7500-11,000 ft.—Rico; Gore Pass; Graymont; 
Chambers’ Lake; Villa Grove; mountains between Sunshine and Ward; 
Marshall Pass; canons and adjoining meadows west of Ouray; Idaho 
Springs; Clear Creek; Ironton; Tennessee Pass; near Pagosa Peak; on Bob 
Creek, West La Plata Mountains; Como; Silver Plume; Gray’s Peak; Ojo; 
Pass Creek; Caribou; Eldora to Baltimore; summit of North Park Range, 
Larimer Co.; Spicer. 
2. Cardamine infausta Greene. (C. cardiophylla Rydb.) In brooks in 
Colo.—Alt. up to 10,000 ft.—Above Beaver Creek; Tennessee Pass. 
3. Cardamine vallicola Greene. In shady wet woods and on river banks 
in Wyo. and Colo.—Alt. 5000-8000 ft.—Bank of Poudre River, Ft. Collins; 
Columbine; Dale Creek. 
4. Cardamine pennsylvanica Muhl. On shaded banks from Newf. to Wash., 
Fla., Kans. and Ore.—Walton Creek; North Park. 
5. Cardamine acuminata Nutt. On shaded banks from Mont, to Alaska, 
Colo, and Ore.—Alt. about 5000 ft.—Ft. Collins. 
23. ARABIS L. Rock-cress. 
Pods erect or nearly so. 
Leaves coarsely hirsute ; the cauline ones cordate or auricled at the base. 
1. A. ovata. 
Leaves not coarsely hirsute. 
Pubescence if any sparse and consisting of 2-forked hairs. 
Plant perfectly glabrous. 2. A. philonipha. 
Lower leaves more or less hairy. 
Lower leaves narrowly oblanceolate ; cauline narrow and acuminate; pods 
about 1.5 mm. wide. 3. A. oxyphylla. 
Lower leaves spatulate ; cauline not long-acuminate; pods about 2 mm. 
wide. 4. A. commixa. 
Pubescence of the lower leaves distinctly stellate. 
Stem over 3 dm. high; basal leaves 3-10 cm. long; petals purple. 
5. A. oblanceolata. 
Stem usually less than 3 dm. high ; basal leaves 1-2 cm. long ; petals white 
or pinkish. 6. A. Crandalii. 
Pods spreading or reflexed. 
Leaves more or less stellate. 
Leaves finely stellate without coarser simple hairs. 
Stem 3-5 dm. high, branched; basal leaves oblanceolate, 5-10 cm. long, 
denticulate. 7. A. Selbyi. 
Stems 1-4 dm. high, simple ; basal leaves 1-5 cm. long. 
Plant green, minutely stellate or sometimes glabrate ; basal leaves usu¬ 
ally entire. 12. A. lignifera. 
Plant densely stellate; basal leaves dentate. 
Petals about 8 mm. long; sepals and upper leaves usually glabrous. 
13. A. rhodantha. 
Petals about 6 mm. long; sepals stellate; leaves usually all stellate. 
8. A. consanguinea. 
Leaves hispid on the margins as well as stellate. 9. A. Fendleri. 
Leaves not stellate, perfectly glabrous or with ciliate margins. 
