BugwoodWiki Article

squarrose knapweed
Centaurea virgata Lam.

Overview

Appearance
Centaurea virgata is a perennial forb that can grow 12-18 in. (30.5-45.7 cm) tall. This species is sometimes confused with diffuse knapweed (Centaurea diffusa), but can be distinguished from Centaurea diffusa by the floral bracts. Bracts on Centaurea virgata are curved outward and are not laterally toothed.
Foliage
The leaves are alternate and deeply dissected.
Flowers
Flowering occurs in early to mid-summer, when pink flowers develop in heads at the tips of the branches.
Fruit
Seeds are dispersed when the plant breaks off at the base and tumbles across the landscape dispersing seeds along the way.
Ecological Threat
Occurs in open disturbed sites, such as rangelands, roadsides, and grasslands. Centaurea virgata is native to the Mediterranean region.

Resources

Selected Images


1624009
1624009

squarrose knapweed
Centaurea virgata
Plant(s)
Steve Dewey
0024099
0024099

squarrose knapweed
Centaurea virgata
Flower(s)
Steve Dewey
1350051
1350051

squarrose knapweed
Centaurea virgata
Flower(s)
Cindy Roche
1459278
1459278

squarrose knapweed
Centaurea virgata
Flower(s)
Steve Dewey
0024100
0024100

squarrose knapweed
Centaurea virgata
Plant(s)
Steve Dewey
0022001
0022001

squarrose knapweed
Centaurea virgata
Infestation
Sara Rosenthal
0024097
0024097

squarrose knapweed
Centaurea virgata
Plant(s)
USDA Agricultural Research Service Archive
0024098
0024098

squarrose knapweed
Centaurea virgata
Plant(s)
USDA Agricultural Research Service Archive
1459277
1459277

squarrose knapweed
Centaurea virgata
Infestation
Steve Dewey
1459279
1459279

squarrose knapweed
Centaurea virgata
Infestation
Steve Dewey
1459282
1459282

squarrose knapweed
Centaurea virgata
Plant(s)
Steve Dewey
5374341
5374341

squarrose knapweed
Centaurea virgata
Flower(s)
Joseph M. DiTomaso

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: CEVI
Bayer: CENSQ
GRIN: 316481
ITIS: 501352
NPDN Pest: PBFARBK

Categories

Category: Forbs/Herbs