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

Madia sativa Molina
Chilean tarweed (coast tarweed)
Asteraceae (Aster family)

Introduction to Vascular Plants

© Adolf Ceska  Email the photographer   (Photo ID #11248)

E-Flora BC Static Map
Distribution of Madia sativa
Click here to view the full interactive map and legend
Details about map content are available here
New! Click on the map dots to view record details.

Species Information

Click on the image below to view an expanded illustration for this species.



General:
Aromatic annual herb from a taproot; stems erect, simple, often branched above, glandular, 0.2-1.0 m tall.
Leaves:
Basal leaves lacking; stem leaves often with clusters of smaller leaves in their axils, alternate, linear or linear-oblong, entire or slightly toothed, unstalked, glandular, 3-18 cm long, 3-12 mm wide; lower stem leaves crowded, soon deciduous.
Flowers:
Heads with ray and disk flowers, numerous in an elongate inflorescence; involucres egg-shaped or broadly urn-shaped, 6-12 mm tall; involucral bracts rounded on the back, glandular; ray flowers yellow, 8-13, 3-7 mm long; disk flowers yellow, 11-14, fertile.
Fruits:
Ray achenes flattened, 2.5-5 mm, glabrous, sometimes mottled, disk achenes sometimes 1-nerved; pappus lacking.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry roadsides and disturbed areas in the lowland and lower montane zones; infrequent in S BC, possibly introduced; native range from N WA to CA, disjunct in Chile.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Madia sativa

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) 130 453 839
Slope Gradient (%) 5 43 84
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
30 195 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 2 5
Modal Nutrient Regime
Class
B
Number of field plots
 species was recorded in:
18
Modal BEC Zone Class
CWH
All BEC Zones (# of stations/zone) species was recorded in: CDF(2), CWH(6), ICH(1)

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 cool mesothermal.

Synonyms and Alternate Names

Madia capitata Nutt.
Madia sativa subsp. capitata (Nutt.) Piper
Madia sativa var. congesta Torr. & A. Gray

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References