Madia sativa Molina
Chilean tarweed (coast tarweed)
Asteraceae (Aster family)
Introduction to Vascular Plants
Chilean tarweed (coast tarweed)
Asteraceae (Aster family)
Introduction to Vascular Plants
Species Information
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.
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
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)
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) |
453 | 130 | 839 |
| Slope
Gradient (%) |
43 | 5 | 84 |
|
Aspect (degrees) |
195 | 30 | 360 |
| Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
2 | 0 | 5 |
| Modal
Nutrient Regime
Class |
B | ||
| #
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) | ||
|
Source:
Klinkenberg 2013
|
|||
Habitat and 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.Status Information
Synonyms
Synonyms and Alternate Names:
Madia capitata Nutt.
Madia sativa subsp. capitata (Nutt.) Piper
Madia sativa var. congesta Torr. & A. Gray