Tetradymia canescens DC.
grey horsebrush (spineless horsebrush)
Asteraceae (Aster family)
Introduction to Vascular Plants
grey horsebrush (spineless horsebrush)
Asteraceae (Aster family)
Introduction to Vascular Plants
Species Information
General:
Evergreen shrub; stems much branched, unevenly woolly-hairy, 10-80 cm tall.
Leaves:
Alternate, entire, white woolly-hairy; primary leaves linear spoon-shaped, 1-3 cm long, 1-4 mm wide; secondary leaves similar but shorter and narrower.
Flowers:
Heads discoid, 3- to 8-headed clusters at the tips of branches; involucres 7-10 mm tall; involucral bracts oblong to egg-shaped or lanceolate, 4 or 5, subequal, white woolly-hairy; ray flowers lacking; disk flowers creamy to bright yellow.
Fruits:
Achenes densely hairy, 3-5 mm long; pappus of numerous white to tawny bristles.
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
USDA Species Characteristics
Flower Colour:
Yellow
Blooming Period:
Late Summer
Fruit/Seed characteristics:
Colour: Brown
Present from Fall to Winter
Source: The USDA
Ecology
Ecological Framework for Tetradymia canescens
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) |
672 | 330 | 1265 |
| Slope
Gradient (%) |
18 | 0 | 65 |
|
Aspect (degrees) |
192 | 10 | 351 |
| Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
3 | 0 | 5 |
| Modal
Nutrient Regime
Class |
C | ||
| #
of field plots species was recorded in: |
32 | ||
| Modal
BEC Zone Class |
BG | ||
|
All BEC Zones (# of stations/zone) species was recorded in |
BG(21), IDF(3), PP(8) | ||
|
Source:
Klinkenberg 2013
|
|||
Habitat and Range
Dry grasslands and shrublands in the steppe and lower montane zones; frequent in SC BC; E to MT and S to NM and CA.Status Information
Synonyms
Synonyms and Alternate Names:
Tetradymia canescens var. inermis (Rydb.) Payson