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)

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Distribution of Hemizonella minima
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Species Information

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General:
Annual herb from a taproot; stems ascending, widely spreading, simple, branched, soft-hairy below, glandular above, 10-20 cm tall,.
Leaves:
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.
Flowers:
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.
Fruits:
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

Ecology

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

Minimum

Average

Maximum

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
Class
B
Number of field plots
 species was recorded in:
1
Modal BEC Zone Class
ICH
All BEC Zones (# of stations/zone) species was recorded in: ICH(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.

Synonyms and Alternate Names

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

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References