Low to medium shrub, 0.3-1.5 m tall; stems spindly, erect to spreading, usually bristly with numerous soft, straight prickles all about the same size, occasionally unarmed especially on younger stems, which are often stalked-glandular; mature stems greyish-brown.
Alternate, deciduous, odd-pinnately compound, the leaf-stalk and axis somewhat stalked-glandular; leaflets 5, 7 or 9, elliptic, 1-4 cm long, double-toothed with gland-tipped teeth, otherwise smooth; stipules glandular and usually blunt-toothed.
Inflorescence of usually single, occasionally 2 to 3, stalked flowers at the ends of lateral branchlets, the stalks bristly-glandular; corollas pale pink to rose, bowl- to saucer-shaped, small (2-3.5 cm across), the petals 5, 10-15 mm long; calyces 5-lobed, the lobes 5-12 mm long, egg-shaped to triangular tapering to a tail-like sharp tip, smooth or occasionally glandular on the back, deciduous; ovaries superior but enclosed in the urn-shaped floral tube (hypanthium); stamens numerous.
Achenes, few to about 12, smooth except for a few long hairs at the tip, enclosed by the fleshy hypanthium, which ripens into an orange to scarlet, pear-shaped to ellipsoid hip 6-10 mm long, the neck and calyx-lobes deciduous.
If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.
Illustration Source: The Illustrated Flora of British Columbia
Present from Summer to Fall
Source: The USDA
||Value / Class
Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
of field plots
species was recorded in:
BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in
|BG(1), CDF(183), CWH(517), ESSF(17), ICH(1065), IDF(530), MS(79), PP(27), SBS(15), SWB(1)|
Source: Klinkenberg 2013
KEY TO ROSA
1. Stipules deeply fringed or comb-like; inflorescence multiflowered..........R. multiflora
1a. Prickles strongly curved, stout; calyx-lobes often with conspicuous lateral segments and usually reflexed after flowering.
2. Lower surface of leaflets stalked-glandular..............R. eglanteria
1a. Prickles not or slightly curved, often slender; calyx-lobes usually without lateral segments, usually ascending or erect after flowering.
3. Calyx-lobes deciduous in fruit, 12 mm long or less; petals 15 mm long or less...............R. gymnocarpa
4. Stems with well-defined infrastipular prickles (pair of prickles at or just below each node) or nearly unarmed.
5. Calyx-lobes usually glandular-bristly; leaflets finely toothed; plants from west of the Coast-Cascade Mountains............R. pisocarpa
6. Flowers small and clustered; calyx-lobes mostly 1-2 cm long and 2-3.5 mm wide at base; petals 1.2-2.5 cm long................R. woodsii
4. Stems more or less bristly with slender prickles; infrastipular prickles, if any, like the others.
7. Flowers mostly solitary, usually on lateral branchlets of current season; leaflets usually 5 to 7 (9); petals more than 2 cm long..................R. acicularis
Source: Illustrated Flora of British Columbia (Vol. 4). (1999)