366 Rydbzrg: Notes on Rosaceae 



When preparing the manuscript for my monograph in 1896, 

 I had not seen any specimens that agreed with Dr. Greene's 

 description of Potentilla lac tea. As most of the characterization 

 of this species, according to Dr. Greene's own statements, were 

 drawn from a "flower painting," the species was to my mind 

 very doubtful. I have since seen several species from central 

 and southern California which agree very well with Dr. Greene's 

 description. These specimens resemble much in habit my own 

 Drymocallis gracilis, but the petals are much smaller, scarcely 

 exceeding the sepals, the plant is smaller and less viscid, and the 

 stem leaves usually reduced. To Drymocallis lactea belong: 

 California: Meadows above Bear Valley, July 23, 1906, 

 H. M. Hall 7562; San Bernardino Mountains, Aug. 1, 1906, Hall 

 7613; vicinity of Hog Ranch, Yosemite National Park, July 1902, 

 Hall & Babcock 3391; Griffins, July 1902, Elmer 3978; San Jacinto 

 Mountains, July 1901, Hall 2355; Sawtooth Peak, 1904, Hall & 

 Babcock 3686. 



Dr. Wolf's treatment of the species belonging to this genus is 

 altogether unsatisfactory. Of course he includes them in the 

 genus Potentilla. Drymocallis pseudorupestris is made a variety 

 of the European Potentilla rupestris, D. convallaria is made a 

 variety of P. argnta; D. lactea is only mentioned under Potentilla 

 rupestris americana; D. rlwmboidea and D. cuneifolia are admitted 

 as species; the rest are all bunched under Potentilla glandulosa. 

 D. incisa and D. Hanseni are regarded as mere forms of P. glandu- 

 losa genuina. D. fissa appears under the name P. glandulosa fissa 

 Th. Wolf, and D. ashlandica is made a mere form of the same. 

 D. valida becomes P. glandulosa glutinosa and D. glabrata is 

 regarded as a form thereof. D. Wrangelliana and D. reflexa are 

 also regarded as varieties of Potentilla glandulosa. This treatment 

 is at variance with the way the plants have been treated in this 

 country, not only by Dr. Greene and myself, who have done the 

 most work on the genera of Potentilleae, but by more conservative 

 botanists. Professor Aven Nelson* regards D. convallaria., D. 

 pseudorupestris, D. fissa, and D. glutinosa (= D. valida) as good 

 species. These were the only Rocky Mountain species known 



* New Manual of Botany of the Central Rocky Mountains. 



