324 University of California Publications in Botany [VOL. 9 



seem sufficient warrant for maintaining it as a species. P. Menziesii 

 Hook. (Fl. Bor. Am., vol. 2, p. 98), in its typical form, ranges from 

 British Columbia through Washington to Oregon and is also found 

 on the mountains of Idaho; the color of the corolla is always violet- 

 blue. 



3. Pentstemon deustus Dougl., in Lindl., Bot. Reg., vol. 16, pi. 

 1318. 1830. 



Type locality. "Native of northwest America, where it was found 

 by Mr. Douglas on scorched, rocky plains, in the interior. ' ' 



Range. East side of the Sierra from Lake Tahoe northward to 

 Washington and east to western Wyoming and Montana. 



Zone. Arid Transition, rising into the Canadian. 



Specimens examined. Independence Lake, Sierra County, Dud- 

 ley, June 19, 1900 ; upper end of Donner Lake, Heller 6967 ; among 

 rocks near Fallen Leaf Lake, Tahoe, Miss Lathrop, July 12, 1909; 

 Angora Peak, Tahoe, 7,200 feet, Smiley 29 ; Fallen Leaf trail to Mt. 

 Tallac, 8,000 feet, Abrams 4824 ; Summit, Dr. Eisen, July, 1891. 



4. Pentstemon procerus Graham, Edinb. New Phil. Jour., vol. 7, 

 p. 348. 1829. 



P. confertus var. caeruleo-purpureus Gray, Proc. Am. Acad., vol. 6, p. 72. 



1866. 



P. confertus procerus Coville, Contr. Nat. Herb., vol. 4, p. 169. 1893. 

 P. pulcliellus Greene, Pitt., vol. 3, p. 310. 1898. 

 P. glastifolius Greene, Leaflets, vol. 1, p. 162. 1906. 

 P. lassenianus Greene, I.e., p. 164. 



Type locality. Not precisely given, but in what is now southern 

 Washington. 



Range. Widely distributed in the Cordilleran section and west- 

 ward, from Alaska and British Columbia southward. 



Zone. Transition and Canadian. 



Specimens examined. Silver Lake, Amador County, 8,000 feet, 

 Hansen 453*; same locality, 7,200 feet, E. Mulliken 126 (with 



* This number has been seen on two sheets, all according to the label from 

 Silver Lake, yet one of the sheets is distinctly of the tall low-mountain form with 

 flowers in several verticils,, the other is of the high-mountain form with flowers 

 aggregated into a single terminal cluster; the next specimen (Mulliken 126) 

 shows an intermediate condition between those states of this species presented by 

 Hansen 's collection. It is quite possible to arrange any large series of sheets of 

 this plant in such a way as to show in convincing manner by what minute differ- 

 ences the intermediate forms pass from the tall lowland type to the depressed 

 alpine state, and how impossible it is to define specific limits within the limits 

 of the variations. In this connection, it is interesting to note the change of view 



