| Common Name: | Tarweed |
| Family: | Asteraceae |
| Genus: | Madia |
| Species: | glomerata |
| Classification/Rank: | Aggressive or Under Bio-control |
| Method of Transportation: | |
| Habitat/Range: | • first found in 1992. • distribution not known but appears to be fairly wide spread. • either spreading rapidly or goes through dramatic population cycles. • native to parts of BC, but unlikely that it is native to the northwest |
• aromatic annual herb from a taproot that grows 0.10 to 0.95 m tall
• stems erect, solitary, simple with few ascending branches, long to stiff hairy
• basal leaves lacking; stem leaves laternate, simple, entire, linear, smooth to stiff hairy
• flowers greenish-yellow to pruplish with ray and disk flowers
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