Hemizonella minima (A. Gray) A. Gray
small-headed tarweed
Asteraceae (Aster family)
Introduction to Vascular Plants
small-headed tarweed
Asteraceae (Aster family)
Introduction to Vascular Plants
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Species Information
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.
Illustration
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.
Illustration 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)
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 |
||
|
Avg |
Min |
Max |
|
| Elevation
(metres) |
1326 | 1326 | 1326 |
| Slope
Gradient (%) |
15 | 15 | 15 |
|
Aspect (degrees) |
120 | 120 | 120 |
| Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
0 | 0 | 0 |
| Modal
Nutrient Regime
Class |
B | ||
| #
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) | ||
|
Source:
Klinkenberg 2013
|
|||
Habitat and 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.Status Information
Synonyms
Synonyms and Alternate Names:
Madia minima (A. Gray) D.D. Keck