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

Madia glomerata Hook.
clustered tarweed (mountain tarweed)
Asteraceae (Aster family)

Introduction to Vascular Plants

© Jim Riley  Email the photographer   (Photo ID #52723)

E-Flora BC Static Map
Distribution of Madia glomerata
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Species Information

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Aromatic annual herb from a taproot; stems erect, solitary, simple or with a few ascending branches, long- to stiff-hairy, yellow stalked-glandular above, 10-95 cm tall.
Basal leaves lacking; stem leaves often with fascicles in their axils, alternate, simple, entire, linear or lance-linear, 2-9 cm long, 1-7 mm wide, glandular, stiff-hairy.
Heads with ray and disk flowers, glomerate in 1-many small clusters or in a more open inflorescence; involucres spindle-shaped, 6-9 mm tall; involucral bracts broadly lanceolate, glandular; ray flowers 1-3, about 2 mm long, sometimes lacking from some heads, greenish-yellow to purplish, 1.5-2.5 mm long; disk flowers 1-10.
Achenes 5-nerved, compressed, glabrous, black, 4-6 mm long; pappus lacking.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist to dry roadsides, meadows, open slopes and forest openings in the lowland and montane zones; infrequent, scattered throughout S BC; E to SK and S to CO, AZ and CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Madia glomerata

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) 660 660 660
Slope Gradient (%) 35 35 35
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
145 144 145
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 2 2
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: PP(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.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References