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coastal tarweed
Scientific Name: Deinandra corymbosa ssp. corymbosa
Family: Asteraceae
Category: Dicot
Growth: Forb/herb
Duration: Annual
Other Names:
Coast Tarweed (Madia sativa)
Madia sativa, commonly known as coast tarweed and Chilean tarweed, is an annual forb belonging to the Asteraceae (Aster or Sunflower) family.
Considerations for Pets
- The text mentions that fruits of several tarweed species, including coast tarweed, can be toxic to livestock when ingested in quantity.
- The plant is described as having coarse glandular hairs (trichomes) and being very sticky, covered with hairs and stalked glands.
- The plant is also described as ill-smelling.
Considerations for Children
- The plant is described as having coarse glandular hairs (trichomes) and being very sticky, covered with hairs and stalked glands.
Taxonomy and Nomenclature
- Scientific Name: Madia sativa Molina
- Family: Asteraceae (also known as Compositae)
- Taxonomic Rank: Magnoliopsida: Asterales: Asteraceae
- Synonyms:
- M. viscosa
- Chilean tarweed
- Tarweed
- Subspecies: Deinandra corymbosa ssp. corymbosa, formerly considered *Hemizonia corymbosa*
Distribution and Habitat
- Native to western North America (California, Oregon, Washington) and South America (Chile).
- Found in coastal scrub environments below 1600 feet.
- Often found in disturbed areas.
Morphological Characteristics and Growth Habits
- An annual forb with coarse glandular hairs (trichomes).
- Erect, ill-smelling, covered with hairs and very sticky.
- Stems are often clustered, branched, and leafy.
- Features smallish yellow flower heads in crowded spike-like clusters (panicles).
- The leaves become sticky and tar-scented in the summer heat.
Ecological Role
- A widespread species not generally planted.
- Drought-evading strategies allow it to blossom when the soil dries out.
Uses
- Ethnobotanic: Coast tarweed seeds have known ethnobotanical uses.
- Garden Usage: Suitable for hillsides, habitat gardens, and butterfly gardens.