620 CALIFORNIA ACADEMY OF SCIENCES. 



view of the great variability in this genus and in view of 

 the peculiar soil in which it grows, I prefer to consider it 

 as a mere variety. Found growing among the spruces at 

 8000 feet altitude, on the most barren clay soil. 



Platystcnion Californicus Benth. This is P. crinitus 

 Greene, but the characters given by Greene do not hold 

 out. No. 5121. Jones, Diamond Valley, Utah, April 

 28, 1895, 3500° alt., in sand. 



Cardamine cordifolia Gray. 



No. 5341. June i, 1894, Marysvale, Utah, 7000° alt., 

 in cold spring. 



This is a form with stems and often the leaves short- 

 shaggy, with white hairs. 



Cai'damine cordifolia var. incana Gray. 



No. S34ia. June i, Marysvale, Utah, 7000° alt., in 

 gravel, in cold springs. 



Very pubescent above, with spreading white hairs. 



Arabis hirsuta var. glabrata T. & G., Fl. i, 80. 



No. 5683. July 25, 1894, Mt. Ellen Park, Henry 

 Mountains, Utah, 9000" alt., in gravel. 



No. 5743b. August 4, 1894, Fish Lake, Utah, 9000° 

 alt., in meadows. 



No. 5601b. July 6, 1894, Soldier Summit, Utah, 7300° 

 alt., in gravel. 



No. 5537c. June 29, 1894, Thistle, Utah, in gravel, 

 5300° alt. 



No. 6o54e. September 17, 1894, Nagle's Ranch, 

 Arizona, Buckskin Mountains, 7800° alt., on the edge of 

 streamlets from springs. 



No. 573 if. Fish Lake, Utah, 9000° alt., in gravel. 



This seems to be a well-marked variety, differing from 

 the typical hirsuta of Europe in the leaves being either 

 entire or sparsely dentate, while the European plant seems 

 to be characterized by very long and often hooked teeth, 



