30 BULLETIN UNIVERSITY OF MONTANA 



Sisymbrium altissimum L. A very common weed in fields throughout. 



Erysimum cheiranthoides L. Ravalli, Evaro, McDonald Lake in the Mis- 

 sion Mts. Missoula (Elrod). 



Erysimum asperum DG. Bigfork. Garrison. 



Radicula Nasturtium (L.) Britten & Rendle. Common in springs through- 

 out. 



Radicula obtusa (Nutt.) Greene. Common at Bigfork, Ronan, Alta, Ra- 

 valli. This is hardly a good species. 



Radicula curvisiliqua (Hook.) Greene. Bigfork. 



Radicula palustris (L.) Moench. Bigfork, Dayton, Alta. 



Barbarea vulgaris var. stricta (And) Gray. Missoula, Swan Lake, Evaro. 



Dentaria macrocarpa Nutt. The leaves are remarkably thick and leathery. 

 Stems spreading and much branched below. Roots white and elongated. It 

 does not grow near water. Flowers very variable in size. McDonald Peak in 

 talus, also crevices of rocks at Lambert Valley. Not seen in the Sperry 

 Glacier region. 



Cardamine Breweri Wat. I can see no difference between this and C. 

 vallicola Nelson. Alta. Also at Missoula by Elrod, Columbia Falls by "Wil- 

 liams, and Mission Mts. by MaoDougal. 



Cardamine oligosperma Nutt. Bull Island, Bigfork, Hot Springs, AJta. 



Cardamine Pennsylvanica Muhl. Bigfork, Poison Swamp, Alta, Swan 

 Lake (Elrod). 



Cardamine parviflora L. Bigfork, Ravalli. 



Arabis Nuttallii Rob. Lambert Valley, Mission Mts., Blackfoot Glacier. 



Arabis glabra (L.) Bernh. Bigfork, Yellow Bay, MacDougal Peak, McDon- 

 ald Lake in the Mission Mountains, Alta, Ravalli, Ronan, Lambert Valley, 

 McDonald Lake. 



Arabis Holboellii Hornem. Alta to the British Boundary. 



Arabis Holboellii var. patula Wat. Upper Marias Pass. Swan Moun- 

 tains (Elrod). 



Arabis suffrutescens Greene. MacDougal Peak. Blackfoot Glacier. 



Arabis Drummondii Gray. McDonald Lake in th Mission Mts., Sperry to 

 Blackfoot Glacier. 



Cleome serrulata Pursh. Bigfork, Hot Springs, Ravalli, Ronan. Missoula 

 (Elrod). 



Drosera rotundifolia L. Swan Lake. Rost Lake (Miss Norton). 



ELROD'S STONECROP. 



Sedum EIrodi n. sp. Closely related to S. divergens. Densely tufted from 

 horizontal and fleshy rootstocks. Perennial. Leaves ovate, sessile, the lower 

 2-5 mm. long, the uppermost oblong-ovate, not over 5-12 mm. long, obtuse 

 smooth. Stems erect from a sometimes decumbent base, closely covered with 

 the nearly imbricated thick and closely appressed leaves, sparingly branched 

 above, ending in 1-2 scorpioid racemes not over 2.5 cm. long and few flowered. 

 Flowers yellow, nearly sessile. Petals lanceolate-acuminate, 7 mm. long, 

 twice as long as the stamens and four times as long as the ovate and obtuse 

 sepals. Follicles united below and divaricate above. At Somers on loose 

 soil and also on rocks in open places. Middle Temperate life zone. 



Sedum stenopetalum Pursh. MaoDougal and McDonald Peaks, Sperry to 

 Blackfoot Glacier. This is S. subalpinun^ Blenkinship, but his characters do 

 not hold. 



Sedum Douglasii var. uniflora (Howell Fl. 213 (1898) as species). Upper 

 Marias Pass. 



Sedum rhodanthum Gray. McDonald Peak, Sperry to Blackfoot Glacier. 

 Lambert Valley, Upper Marias Pass. Mt. Lolo (Elrod). 



Saxifraga oppositifolia L. Rare. Lambert Valley. Mission M'ountains 

 (Elrod). 



Saxifraga adscendens L. MacDougal Peak. 



Saxifraga chrysantha Gray. Mt. Lolo (Elrod). 



