160 RYDBERG: NOTES ON ROSACEAE 
Stem climbing, with scattered prickles, rarely with 
intermixed bristles; sepals more or less lobed; foliage 
glandular-punctate, sweet-scented. II. CANINAE, 
Stem not climbing, at least the young shoots bristly; 
prickles infra-stipular or lacking; sepals entire or the 
outer sometimes with one or two lobes; foliage not 
very sweet-scented. III. CINNAMOMEAE. 
Pistils few; styles deciduous with the ond part of the 
hypanthium, which falls off like a rin: IV. GYMNOCARPAE. 
I. SYNSTYLAE 
Stipules pectinately lobed and glandular-ciliate; corymb 
many-fiowered. 
1. R. multifiora. 
Stipules merely serrate; corymb one- to few-flowered. 2. R. arvensis. 
I. ROSA MULTIFLORA Thunb. 
See my notes in the preceding paper of this series.* The 
species has been reported as a ballast plant at one station in 
Washington. 
2. ROSA ARVENSIS Huds. 
The following specimens were sent to me by J. C. Nelson, 
principal of the high school at Salem, Oregon, for determination. 
In the accompanying letter Mr. Nelson wrote among other things: 
“He [the collector] reports this form as common in the vicinity of 
Vancouver [Washington], apparently fully spontaneous. The - 
flowers were always single, and the petals of a wonderful shade of 
pearly white.”’” The specimens apparently belong to the so-called 
Ayrshire Rose, which is by some regarded as a form of R. arvensis, 
by others as a hybrid of the same. The leaflets are larger and 
more pointed and the sepals more inclined to be lobed than in the 
wild English form of that species. 
WASHINGTON: Vancouver, R. V. Bradshaw 1053. 
II. CANINAE 
Leaflets suborbicular or broadly oval , mostly rounded at the | 
apex; hypanthium in fruit obovoid or broadly ellipsoid, 
abruptly contracted at the apex; sepals tardily deciduous 
or persistent. 
Leaflets ovate or oval, acute or short-acuminat 
in fruit narrowly ellipsoid, tapering at both. th ends sitet 
early deciduous; styles glabrous or nearly 
* Bull. Torrey Club 47: 47. 1920. 
3. R. rubiginosa. 
4. R. micrantha, 
