bull cottonthistle, Scotch thistle, taurus cotton thistle
- Onopordum tauricum is a biennial herb that can grow up to 8 ft. (2.4 m) tall.
- The leaves of O. tauricum are bright green in color and from 3.9-9.8 in. (10-25 cm) long. Leaves are covered with short hairs, are acutely triangular and have toothed lobes.
- Onopordum tauricum flower heads are spherical and bright purple to pink in color. They are from 3-4 in. (7.6-10.2 cm) in diameter with numerous spiny bracts. Flowering occurs in summer.
- Fruits are from 0.2-0.24 in. (5-6 mm) long. Each fruit contains several white to tan seeds from 0.31-0.39 in. (8-10 mm) long. Seeds have short bristles. This plant reproduces by seed.
- Ecological Threat
- Onopordum tauricum prefers disturbed areas including fields and roadsides. It is native to temperate Asia and eastern Europe.
- Oregon Department of Agriculture Plant Programs, Noxious Weed Control
- University of California, Jepson Flora Project
- Flora of North America, www.eFloras.org
- USDA NRCS PLANTS
- USDA ARS GRIN
Images from Bugwood.org