Two New PIa)itsJ'r<i)ii Mount Mazoina, Oregon. 171 



and 1.5 mm. wide, faptijiriately erect on the slender ascendina: pedicels, the 

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

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

 1 to 1.2 mm. wide, tlie cotyledons accumbent. 



Type specimen in the United States National IIerl)arium, collected 

 .\ugust lo, ISUG, at Crater Lake, Mount Mazania, Oregon, at an altitude 

 of 2:500 meters, by Frederick V. Coville and John B. Leiberg, No. 420. 



The tyi)ical form of Cardnmine bellidifoltd 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 (;learly 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 commonl}'- 

 1 by 1.5 mm. 



Gdrdamine bellidifolia, a circum[H)lar plant, is known s[)aringly 

 in the Western Hemisphere from Greenland to the islands of 

 Bering Sea, southward to the \\'hite Mountains of New Hamp- 

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

 the Cascade Mountains of Washington. As indicated by both 

 American and European specimens, it is a plant of humid ha1)i- 

 tat, often if not always growing in moss}' places and on granitic 

 soil. C. beUidlfuli.a pac.hyphjlla occupies geogra[)hically a position 

 contiguous to the westernmost arm of southern montane exten- 

 sion of C. hellidifolla, niitnely .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 

 rock}^ slopes of the Watchman, is a ])ulverized pumice. This, 

 althougli in early spring well sup})lied with moisture from the 

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

 onl}^ 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- 

 folid. by sending down a deeper tap-root for moisture and l)_y 

 developingthicker leaves to accommodate itself to drier surround- 

 ings and reduced trans})iration. 



