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

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  Email the photographer   (Photo ID #21977)

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Distribution of Helianthella uniflora var. douglasii
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Species Information

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General:
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.
Leaves:
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.
Flowers:
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.
Fruits:
Achenes strongly compressed, wing-margined, finely-appressed-hairy; pappus of 2 upwardly hairy, unequal awns.

Source: The Illustrated Flora of British Columbia

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

Ecology

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

Minimum

Average

Maximum

Elevation (metres) 1540 1540 1540
Slope Gradient (%) 33 33 33
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
143 142 143
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 0 0
Modal Nutrient Regime
Class
A
Number of field plots
 species was recorded in:
1
Modal BEC Zone Class
MS
All BEC Zones (# of stations/zone) species was recorded in: MS(1)

Climate

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

Additional Photo Sources

General References