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

Tetradymia canescens DC.
grey horsebrush (spineless horsebrush)
Asteraceae (Aster family)

Introduction to Vascular Plants

© David Shackleton  Email the photographer   (Photo ID #79619)

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Distribution of Tetradymia canescens
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Species Information

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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.

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

Habitat / 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.

Source: The Illustrated Flora of British Columbia

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)
Site Information
 Value / Class

Minimum

Average

Maximum
Elevation (metres) 330 672 1265
Slope Gradient (%) 0 18 65
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W] 		10 192 351
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric] 		0 3 5
Modal Nutrient Regime
Class		 C
Number 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)

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

Tetradymia canescens var. inermis (Rydb.) Payson

Taxonomic and Nomenclatural Links

Flora North America treatment for Asteraceae
 Flora North America treatment for Tetradymia canescens
Genetic information (NCBI Taxonomy Database)
 International Plant Names Index
 Taxonomic Information from the World Flora Online
 Integrated Taxonomic Information System

Additional Photo Sources

Images From CalPhoto
UT Austin's Native Plant Database
 Google Image Search
 Flickr Image Search

General References

Google Scholar Search
Family References
 General Botanical References for BC
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2020. E-Flora BC: Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for Advanced Spatial Analysis, Department of Geography, University of British Columbia, Vancouver. [Accessed: 2024-11-24 9:11:18 AM ]
Disclaimer: The information contained in the E-Flora atlas pages is derived from expert sources as cited in each section. This information is scientifically based. E-Flora also acts as a portal to other sites via deep links. As always, users should refer to the original sources for complete information. E-Flora BC is not responsible for the accuracy or completeness of the original information.
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