diffuse knapweed USDA PLANTS SYMBOL: CEDI3
Centaurea diffusa Lam.
Synonym(s): white knapweed

Centaurea diffusa is a biennial, annual, or short-lived perennial that is 8-40 in. (20.3-101.6 cm) tall.
The leaves are stalked and lobed. The leaves become smaller and less divided as they move up the stem.
Flowering occurs from July to September. White flowers develop in urn-shaped heads, in clusters, at the ends of the branches. The heads are subtended by leathery bracts. The lower and middle bracts have brown margins with spines at the tips.
Seeds are achenes, 0.08-0.12 in. (2-3 mm) long with a plume of bristle-like hairs.
Ecological Threat
This species prefers well drained soils, gravel pits, trails, pastures and roadsides.

Identification, Biology, Control and Management Resources