E-Flora BC: Electronic Atlas of the Flora of British Columbia

Helianthella uniflora (Nutt.) Torr. & A. Gray
Rocky Mountain helianthella (oneflower helianthella; one-flowered little sunflower)
Asteraceae (Aster family)

Introduction to Vascular Plants

© Jim Riley  Email the photographer   (Photo ID #27911)

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Distribution of Helianthella uniflora
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Helianthella uniflora var. douglasii

Species Information

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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.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

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

Habitat / Range

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

Source: The Illustrated Flora of British Columbia


Ecological Framework for Helianthella uniflora

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) 545 987 1587
Slope Gradient (%) 0 32 68
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
90 187 226
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
1 3 7
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: BG(1), IDF(1), MS(1), SBS(1)


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Taxonomic and Nomenclatural Links

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General References