Helianthella uniflora var. douglasii (Nutt.) Torr. & A. Gray (Torr. & A. Gray) W.A. Weber
Rocky Mountain helianthella (Douglas' helianthella)
Asteraceae (Aster family)

Introduction to Vascular Plants


© Curtis Bjork     (Photo ID #21977)


E-Flora BC Static Map

Distribution of Helianthella uniflora var. douglasii
Click here to view the full interactive map and legend

Species Information

Perennial herb from a taproot and branching stem-base; stems erect or ascending, simple or several, harshly stiff-hairy to spreading-hairy or smooth below, 0.2-1 m tall.
Basal leaves soon deciduous; middle and upper leaves opposite, simple, entire, roughened, lanceolate or elliptic, more or less 3-nerved, up to 15 cm long, 5 cm wide; lowermost leaves oblanceolate and smaller than those above.
Heads with ray and disk flowers, solitary; involucral bracts lance-linear, often pointed, stiff-hairy, also with marginal hairs; ray flowers bright yellow, 13-21, 2-4.5 cm long; disk flowers yellow; involucres 12-15 mm tall.
Achenes strongly compressed, wing-margined, finely-appressed-hairy; pappus of 2 upwardly hairy, unequal awns.

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.


Ecological Framework for Helianthella uniflora var. 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)
1540 1540 1540
Slope Gradient (%)
33 33 33

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

142 143 143
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 0 0
Modal Nutrient Regime
# of field plots
 species was recorded in:
Modal BEC Zone Class

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


Habitat and Range

Dry open slopes and forests in the steppe and lower montane zones; locally frequent in SC BC; S to MT and OR.

SourceThe Illustrated Flora of British Columbia