- Centaurea nigra is a perennial plant that can grow from 1-3 ft. (0.3-0.9 m) tall.
- Leaves, near the base, are petiolate, oblanceolate, shallowly dentate and 2-10 in. (5-25 cm) long. As leaves move up the stem, they become smaller, sessile, linear, and entire.
- Flowering occurs from June to October, when purple (rarely white) flowers appear in heads at the tips of the branches.
- Fruit is a tan, hairy achene 0.08-0.12 in. (2-3 mm) long, may have a small, dark pappus.
- Ecological Threat
- Centaurea nigra is native to Europe and was first found in the United States in 1895 in Pullman, Washington. Preferred habitat includes roadsides, waste places, fields and clearings.
- Washington State Noxious Weed Control Board
- University of California, Jepson Flora Project
- USDA NRCS PLANTS
- USDA ARS GRIN