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

Anisocarpus madioides Nutt.
woodland tarweed (woodland madia)
Asteraceae (Aster family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #6955)

E-Flora BC Static Map
Distribution of Anisocarpus madioides
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Species Information

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Aromatic biennial or short-lived perennial herb from a short rhizome; stems erect, simple, few branched above; stiff-hairy below, glandular above, 20-70 cm tall.
Basal leaves lacking; stem leaves alternate and reduced upwards, opposite and linear to oblong, coarsely, straight appressed-hairy, 3-10 cm long, 4-11 mm wide near the base.
Heads with ray and disk flowers, few, terminal at ends of branches in a loose inflorescence; involucres globose to urn-shaped, 4-6 mm tall; involucral bracts linear, rounded on the back, 3-5, glandular; ray flowers yellow, 8-15, 2-3 mm long; disk flowers 10-30, fertile.
Ray achenes 5-nerved, 1/2-mooned, flattened, 3-5.5 mm long, sometimes beaked, disk achenes undeveloped, hairy, 3-4 mm long; ray pappus lacking or vestigial, disk pappus of 5-8 more or less lanceolate, separate or somewhat united, unequal scales.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist to mesic open forests and grasslands in the lowland and lower montane zones; common in SW BC, known from S Vancouver Island and the adjacent Gulf Islands; S to CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Anisocarpus madioides

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) 15 152 244
Slope Gradient (%) 7 30 70
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
90 148 180
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 2 3
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: CDF(7)


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 cool mesothermal.

Synonyms and Alternate Names

Madia madioides (Nutt.) Greene

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References