Low to medium shrub, 0.5-2 m tall, spreading by rhizomes and sometimes thicket-forming; stems spindly to stout, erect to spreading, usually with a pair of straight prickles near the base of the leaves, bristly internodal prickles present or absent, usually lacking on flowering shoots; mature stems blackish.
Alternate, deciduous, odd-pinnately compound, the axis short-hairy; leaflets 5, 7 or 9, elliptic to egg-shaped, 1.5-6 cm long, finely and closely saw-toothed, short-hairy beneath; stipules short-hairy and sometimes glandular-blunt-toothed.
Inflorescence of (1) 2 to 10 stalked flowers in a small, short cluster at the end of a lateral branchlet; corollas pink, saucer-shaped, rather small (3-5 cm across), the petals 5, 12-20 mm long; calyces 5-lobed, the lobes lanceolate, long-tapering and narrrowing then flaring below the tip, 10-15 mm long, stalked-glandular on the back, persistent; ovaries superior but enclosed in the urn-shaped floral tube (hypanthium), the hypanthium glaucous; stamens numerous.
Achenes, numerous, stiffly long-hairy on one side, enclosed by the fleshy hypanthium, which ripens into a reddish-purple, globe- or pear-shaped to ellipsoid hip 6-12 mm long.
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 Spring 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
Source: Klinkenberg 2013
Synonyms and Alternate Names:
Rosa pisocarpa var. rivalis (Eastw.) Jeps.
Rosa rivalis Eastw.
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)