164 BRASSIACEAE. 



Plant perfectly glabrous ; beak of the pod less than i mm. long. 



4. C. Pennsylvania a. 



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 i 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. 



i. 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- ^- 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. 



