Vol. 44 | No. 10 
BULLETIN 
OF THE 
TORREY BOTANICAL CLUB 
ee 
OCTOBER, 1914 
Notes on Rosaceae—VIII 
Per AXEL RYDBERG 
DRYAS 
Little has been added to the knowledge of this genus in the last 
eighty years. Only one species has been added, Dryas tomentosa 
Farr, 
. Dryas integrifolia Wahl. Many authors regard this as merely 
a variety of D. octopetala, as intermediate forms are met with, 
but these have only been found where the two species grow to- 
gether and are probably all of hybrid origin. Nathorst* was 
inclined to regard these forms as hybrids, but he did not call 
them by a hybrid name, denoting them as D. octopetala f. inter- 
media. Hartz} held the same opinion, but apparently by a slip 
_ of the pen called them D. integrifolia intermedia Nathorst. This 
hybrid has also been collected in Alaska at Orca, Prince William’s 
Sound, 1899, Coville & Kearney 1101. 
Dryas octopetala L. Hartz, loc. cit., admitted several varieties 
of Dryas octopetala, viz. var. minor Hook., var. hirsuta Hartz, and 
var argentea Blytt. The last one of these seems to be furthest from 
the type, but by no means deserving specific rank. Simmons 
described a similar form of D. integrifolia, viz. D. integrifolia 
canescens, 
Dryas tomentosa Farr. This species is closely related to D. 
Drummondii and perhaps not distinct. It may be only a variety 
* Ofvers, Kong. Sv. Vet. Akad. Hand. 411: 24. 1884. 
T Medd. Groenl. 18: 321. 1895. 
IThe BULLETIN for September (41: 435-482) was issued 8 O 1914.] 
