366 RypDB2RG: 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 lactea. 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 5686. 
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. arguta; D. lactea is only mentioned under Potentilla 
rupestris americana; D. rhomboidea 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. 
