General:
Low to medium shrub, 0.3 to 1.5 m tall, spreading by extensive rhizomes, sometimes forming thickets; stems spindly to stout, erect to arching, usually covered with numerous straight, bristly prickles of various sizes, but twigs of the year often not prickly; mature stems reddish- to greyish-brown.
Leaves:
Alternate, deciduous, odd-pinnately compound, the axis usually hairy and glandular; leaflets usually 5 or 7, oblong-elliptic, 2-5 cm long, coarsely double-toothed, the teeth often gland-tipped, more or less rounded at the base, usually somewhat hairy on the underside; stipules hairy, glandular on the margins.
Flowers:
Inflorescence of usually single, occasionally 2 or 3, stalked flowers on lateral branchlets; corollas pink, saucer-shaped, (4) 5-7 cm across, the petals 5, 2-3 cm long; calyces smooth, 5-lobed, the lobes lanceolate, long-tapering and narrowing then flaring below the tip, persistent, becoming erect and converging in fruit; ovaries superior but enclosed in the urn-shaped floral tube (hypanthium); stamens numerous.
Fruits:
Achenes, 15 to 25, stiffly long-hairy on one side or towards the tip, enclosed by the fleshy hypanthium, which ripens into a scarlet to purplish, globe- to pear-shaped or ellipsoid hip 1-2 cm 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
Site Information |
Value / Class |
||
Avg |
Min |
Max |
|
Elevation
(metres) |
1327 | 1323 | 1331 |
Slope
Gradient (%) |
45 | 31 | 60 |
Aspect (degrees) |
137 | 103 | 173 |
Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
2 | 2 | 2 |
Modal
Nutrient Regime
Class |
B | ||
#
of field plots species was recorded in: |
2 | ||
Modal
BEC Zone Class |
SWB | ||
All BEC Zones (# of stations/zone) species was recorded in |
SWB(2) | ||
Source:
Klinkenberg 2013
|
Synonyms and Alternate Names:
Rosa acicularis var. bourgeauiana (Crép.) Crép.
Rosa acicularis var. sayana Erlanson
Rosa bourgeauiana Crép.
Rosa collaris Rydb.
Rosa engelmannii S. Watson
Rosa sayi Schwein.
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) |