- Centaurea melitensis is a winter annual with a yellow-flowered, spiny head that can reach a height of 3.3 ft. (1 m). tall.
- Leaves are alternate, linear or narrowly oblong with smooth, toothed margins. Leaf bases are decurrent and give the stems a winged appearance.
- Flowers are yellow, 0.5 in. (1.3 cm) across, and surrounded by sharp, tan, 0.5 in. (1.3 cm) long, spiny cobwebbed bracts. Blooming occurs from April to September.
- The fruit are 0.08-0.12 in. (2-3 mm) in length, grayish to tan in color with deeply notched bases and tan bristles that are 0.04-0.12 in. (1-3 mm) long.
- Ecological Threat
- Centaurea melitensis prefers disturbed areas such as grasslands, open woodlands, roadsides, fields, and pastures. It is native to Europe and North America.
Global Invasive Species Database. 2011. Invasive Species Specialist Group (ISSG) of the IUCN Species Survival Commission 
University of California, Jepson Flora Project 
Texas Invasive Plant and Pest Council 
CABI Invasive Species Compendium 
California Invasive Plant Council
USDA NRCS PLANTS 
USDA ARS GRIN 
Images from Bugwood.org