BugwoodWiki Article

diffuse knapweed
Centaurea diffusa Lam.

Overview

Appearance
Centaurea diffusa is a biennial, annual, or short-lived perennial that is 8-40 in. (20.3-101.6 cm) tall.
Foliage
The leaves are stalked and lobed. The leaves become smaller and less divided as they move up the stem.
Flowers
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.
Fruit
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.

Resources

Selected Images


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0024090

diffuse knapweed
Centaurea diffusa
Plant(s)
Sara Rosenthal
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1350049

diffuse knapweed
Centaurea diffusa
Plant(s)
Cindy Roche
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1459254

diffuse knapweed
Centaurea diffusa
Flower(s)
Steve Dewey
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1459257

diffuse knapweed
Centaurea diffusa
Flower(s)
Steve Dewey
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1148105

diffuse knapweed
Centaurea diffusa
Flower(s)
USDA APHIS PPQ Archive
1350078
1350078

diffuse knapweed
Centaurea diffusa
Flower(s)
Cindy Roche
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5358643

diffuse knapweed
Centaurea diffusa
Flower(s)
L.L. Berry
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5374333

diffuse knapweed
Centaurea diffusa
Seedling(s)
Joseph M. DiTomaso
1459255
1459255

diffuse knapweed
Centaurea diffusa
Plant(s)
Steve Dewey

Maps


EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org

EDDMapS Distribution

State Regulated List - This map identifies those states that list this species on their regulated list. For more information, visit Invasive.org

State Regulated List

Taxonomic Rank

Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Asteridae
Order: Asterales
Family: Asteraceae
Genus: Centaurea

Other System Links

Plants: CEDI3
Bayer: CENDI
GRIN: 104125
ITIS: 36958
NPDN Pest: PBFARBC

Synonyms and Other Names

Other Common Names:
white knapweed

Related Scientific Names:

Acosta diffusa Lam.(Synonym)

Categories

Category: Forbs/Herbs