RYDBERG: NOTES ON ROSACEAE 161 
3. ROSA RUBIGINOSA L. 
The European sweet brier, often cultivated, has established 
itself at several places in Oregon and Washington. It is very 
variable and the naturalized specimens show also much variation. 
One of these many forms, which is rather more glandular than 
usual, was mistaken for a native species and published by Dr. 
E. L. Greene as new, under the name R. Walpoleana. The 
author placed it in the GYMNOCARPAE, a group to which it has no 
relation. 
4. ROSA MICRANTHA Borrer 
See Bull. Torrey Club 47: 49. 1920. This species also is 
naturalized in Oregon and Washington. 
III. CINNAMOMIAE 
Infra-stipular prickles not present; branches unarmed or 
istly, not. prickly. 
Stem densely bristly even in age; flowers solitar 
Hypanthium decidedly pear-shaped or ae tenet acute 
se, with a distinct neck at the top. 
Sepals rarely more than 1 cm. long; bark yellowish 
ee 5. R. collaris. 
green. 
ine) 2-3 cm. long; bark brown. 
lets obovate, sparingly hairy beneath. . R. Butleri. 
ia lets Maer densely pubescent beneath. 7. R. acicularis. 
Hypanthium subglobose, almost without a neck. 8. R. Bourgeauiana, 
Stem unarmed or tl n young covered with more or less 
deciduous bristles; flowers corymbose 
Fruit ellipsoid; leaflets serrate. 32. R. Pringlei. 
Fruit subglobose; leaflets crenate. 9. R. anacantha. 
Infra-stipular prickles present. 
Flowers mostly solitary; petals usually 2.5 cm. long or 
(except in No. 11); hypanthium in fruit 12-20 
m. thick. 
pean oe or nearly so. 
Hypanthium densely stent: 10. R. MacDougalii. 
OS not prickly or rarely slightly so. ; 
eaflets more or less double-toothed, more or 
ular-granuliferous beneath; stip- 
pirate “= —_ ceena 
Di bristly but hypan- 
thium glabrous; leaflets oval, rarely 2 cm. 
. Yainacensis. 
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Pedicels and calyx not bristly, sometimes 
slightly shiatuk Weck 
