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coastal tarweed
Scientific Name: Deinandra corymbosa ssp. macrocephala
Family: Asteraceae
Category: Dicot
Growth: Forb/herb
Duration: Annual
Other Names:
Coast Tarweed (Madia sativa)
Madia sativa, commonly known as coast tarweed or Chilean tarweed, is an annual forb belonging to the aster family (Asteraceae).
Considerations for Pets
- The leaves of coast tarweed become sticky and tar-scented in the summer heat due to glandular hairs (trichomes).
Considerations for Children
- The plant is covered with hairs and very sticky, stalked, yellow to black glands.
Taxonomy and Nomenclature
- Scientific Name: Madia sativa Molina
- Family: Asteraceae (also known as Compositae)
- Synonyms: M. viscosa. Several other tarweeds have been reclassified into the genus Deinandra.
- Taxonomic Rank: Magnoliopsida: Asterales: Asteraceae
Common Names
- Coast Tarweed
- Chile Tarweed
- Chilean Tarweed
- Coastal Tarweed
Distribution and Habitat
- Native to western North America (California, Oregon, Washington) and South America (Chile).
- Found in coastal scrub habitats, typically below 1600 feet.
- Often found in disturbed areas.
Morphology and Growth
- Annual forb with coarse glandular hairs (trichomes).
- Erect and often ill-smelling.
- Stems are often clustered, branched, and leafy.
- Features smallish yellow flower heads in crowded spike-like clusters (panicles).
Ecological Role
- A widespread species not generally planted.
- Its drought-evading strategies allow it to flourish when the soil dries out.
Garden Usage
- Suitable for hillsides, habitat gardens, and butterfly gardens.
Interactions with Other Organisms
- Bees and beetles are known to visit the flowers.
Further Information
- USDA NRCS National Plant Data Center
- Rancho Santa Ana Botanic Garden
- CalPhotos