Madia exigua
Species of flowering plant
| Madia exigua | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Genus: | Madia |
| Species: | M. exigua |
| Binomial name | |
| Madia exigua (Sm.) A.Gray | |
Madia exigua is a species of flowering plant in the family Asteraceae known by the common names small tarweed and threadstem madia.
Range
Madia exigua is native to western North America from British Columbia to Baja California, where it grows in many types of dry habitat outside the deserts.
Description
Madia exigua is an aromatic annual herb growing up to half a meter (20") tall, its slender stem coated with hairs, large stalked resin glands, and sometimes bristles. The rough-haired leaves are 1 to 4 centimeters (0.4 to 1.6") long.
The inflorescence is an array of clustered flower heads on thin, stiff peduncles. Each head has an involucre of phyllaries shaped like a top. The phyllaries are coated in knobby yellow resin glands. At the tip of the inflorescence are minute yellowish ray florets each under a millimeter long, and one or two yellow disc florets. The fruit is an achene with no pappus.
External links
- Jepson Manual Treatment: Madia exigua
- USDA Plants Profile: Madia exigua
- Flora of North America: Madia exigua
- Madia exigua — U.C. Photo gallery
Media related to Madia exigua at Wikimedia Commons
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