Spiraea douglasii Hook.
hardhack (Douglas' spirea (ssp. douglasii); Menzies' spirea (ssp. menziesii); pink spirea; rose spirea)
Rosaceae (Rose family)

Introduction to Vascular Plants


© Jim Riley     (Photo ID #70127)


E-Flora BC Static Map

Distribution of Spiraea douglasii
Click here to view the full interactive map and legend

Species Information

Low to medium shrub, 0.5-2.5 m tall, from creeping rhizome, often forming thickets; stems erect, much-branched, the slender branchlets usually somewhat woolly, later becoming smooth.
Alternate, deciduous, short-stalked, oblong to egg-shaped, 3-10 cm long, coarsely toothed mostly above the middle, dark green and smooth above, paler and woolly-hairy to smooth beneath.
Inflorescence a branched, narrowly conic to cylindric, dense terminal cluster of numerous small flowers, the cluster several times longer than broad, the branches often woolly; corollas deep to pale pink, the petals 5, egg-shaped to round-elliptic, about 2 mm long; calyces fine-hairy to nearly smooth on the outside, 5-lobed, the lobes triangular, bent back, about 1 mm long; ovaries superior; stamens numerous.
Follicles, usually 5, short-beaked, 2-3 mm long, somewhat leathery, smooth except sometimes a few long hairs along the suture, shining; seeds several, spindle-shaped.
Two subspecies occur in BC:

1. Leaves greyish-woolly beneath; plants of the coast................... ssp. douglasii

1. Leaves smooth to hairy, but not greyish-woolly beneath; plants from throughout southern two-thirds of BC.................. ssp. menziesii (Hook.) Calder & Taylor

SourceThe Illustrated Flora of British Columbia


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.

USDA Species Characteristics

Flower Colour:
Blooming Period:
Mid Summer
Fruit/Seed characteristics:
Colour: Brown
Present from Summer to Fall
Source:  The USDA


Ecological Framework for Spiraea douglasii

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class




Elevation (metres)
676 0 1700
Slope Gradient (%)
4 0 200

Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]

202 0 354
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
5 0 8
Modal Nutrient Regime
# of field plots
 species was recorded in:
Modal BEC Zone Class

All BEC Zones (# of stations/zone) species was recorded in

BWBS(1), CDF(43), CWH(261), ESSF(29), ICH(211), IDF(14), MH(5), MS(20), SBPS(8), SBS(493)

Habitat and Range

Fens, swamps, bogs, streambanks, lake margins, and moist to wet thickets and open forests in the lowland and montane zones; common throughout BC, S of about 56oN; S to CA and ID.

SourceThe Illustrated Flora of British Columbia