Two New Plants from Mount Mazama, Oregon. 171 



and 1.5 mm. wide, fastigiately erect on the slender ascending pedicels, the 

 styles exceeding the valves by about 2 mm. ; seeds in one row, oblong, 

 flat, not winged, often margined at the distal end, about 2 mm. long by 

 1 to 1.2 mm. wide, the cotyledons accumbent. 



Type specimen in the United States National Herbarium, collected 

 August 15, 1896, at Crater Lake, Mount Mazama, Oregon, at an altitude 

 of 2300 meters, by Frederick V. Coville and John B. Leiberg, No. 426. 



The typical form of Cardamine bellidifolia is a less robust plant, 

 slenderer throughout, the caudex and its branches commonly 

 about 1 mm. thick ; the leaves of a light green color and thinner 

 texture, with venation clearly evident on the back, at least in 

 dried specimens, and the petioles apparently always green 

 throughout ; the capsules about 2 cm. long, their styles exceeding 

 the valves by about 1 mm. ; the fruiting pedicels seldom exceed 

 ing 6 mm., usually less than 5 mm. ; and the seeds commonly 

 1 by 1.5 mm. 



Cardamine bellidifolia, a circumpolar plant, is known sparingly 

 in the Western Hemisphere from Greenland to the islands of 

 Bering Sea, southward to the White Mountains of New Hamp 

 shire, the Rocky and Selkirk Mountains of British Columbia, and 

 the Cascade Mountains of Washington. As indicated by both 

 American and European specimens, it is a plant of humid habi 

 tat, often if not always growing in mossy places and on granitic 

 soil. C. bellidifolia pachyphylla occupies geographically a position 

 contiguous to the westernmost arm of southern montane exten 

 sion of C. bellidifolia, namely, the Cascade Mountains of southern 

 Oregon and adjacent isolated peaks in northern California. The 

 soil on which it grows at Crater Lake, where it occurs on the 

 rocky slopes of the Watchman, is a pulverized pumice. This, 

 although in early spring well supplied with moisture from the 

 melting snow, soon becomes very dry at the surface and supports 

 only a scanty vegetation, even mosses being almost entirely want 

 ing. Doubtless on Lassen Peak and Mount Shasta, both of which 

 are volcanic cones, it finds a similar soil. Under these condi 

 tions it appears to have differentiated from the typical C. bellidi 

 folia by sending down a deeper tap-root for moisture and by 

 developing thicker leaves to accommodate itself to drier surround 

 ings and reduced transpiration. 



