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

Hemizonella minima (A. Gray) A. Gray
small-headed tarweed
Asteraceae (Aster family)

Introduction to Vascular Plants

© Jim Riley  Email the photographer   (Photo ID #27819)

E-Flora BC Static Map
Distribution of Hemizonella minima
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Species Information

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Annual herb from a taproot; stems ascending, widely spreading, simple, branched, soft-hairy below, glandular above, 10-20 cm tall,.
Basal leaves linear to more oblong, 1-2 cm long, 1-2.5 mm wide, sometimes toothed, appressed-hairy to more stiff-hairy; stem leaves similar, opposite.
Heads with ray and disk flowers, solitary or few, terminal at ends of branches in a rounded- or flat-topped inflorescence; involucres turnip-shaped, 2-4 mm tall; involucral bracts rounded on the back, 3-5, glandular; ray flowers yellow, 8-15, 2-3 mm long; disk flowers 1 (rarely 2 or 3), fertile.
Ray achenes compressed, 1.8-2.8 mm long, incurved, often with a minute, curved beak, hairy; pappus lacking.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry mossy rock outcrops, disturbed areas and forest openings in the lowland and lower montane zones; infrequent in SW BC, known from SE Vancouver Island and the adjacent Gulf Islands, rare in SW BC (Victoria area) and SC BC (Anarchist Mountain); S to CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Hemizonella minima

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) 1326 1326 1326
Slope Gradient (%) 15 15 15
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
120 120 120
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 0 0
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: ICH(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.

Synonyms and Alternate Names

Madia minima (A. Gray) D.D. Keck

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References