BugwoodWiki Article

alpine knapweed
Centaurea nigrescens Willd

Overview

Appearance
Centaurea nigrescens is a perennial herb with erect, branched, glabrous or somewhat long-hairy stems that grows 1.3-3.2 ft. (0.4-1.0 m) tall.
Foliage
Stems are erect or ascending, openly branched distally, villous to scabrous with septate hairs and loosely tomentose. Leaves are basal and proximal cauline, petiolate, blades oblanceolate or elliptic, 2-10 in. (5-25 cm) long, margins entire or shallowly dentate to irregularly pinnately lobed; distal cauline sessile, not decurrent, blades linear to lanceolate, gradually smaller, entire or dentate.
Flowers
Flowers are radiant or discoid, in few-headed corymbiform arrays, borne on leafy-bracted peduncles. The involucres are 0.6-0.7 in. (15-18 mm), subcylindric to ovoid or campanulate, usually longer than wide, even when pressed. Flowering summer-fall (Jun-Oct).
Fruit
Fruit are gray to light brown, 0.09-0.11 in. (2.5-3 mm) long, and finely hairy. The seeds are small, 0.02-0.04 in. (0.5-1 mm) long, and darkly colored.
Ecological Threat
Centaurea nigrescens can be found in disturbed areas including along roadsides, fields, pastures, and waste areas. It is native to Europe.

Resources

Selected Images


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5374351

alpine knapweed
Centaurea nigrescens
Plant(s)
Joseph M. DiTomaso
5374352
5374352

alpine knapweed
Centaurea nigrescens
Flower(s)
Joseph M. DiTomaso
5435708
5435708

alpine knapweed
Centaurea nigrescens
Plant(s)
Eric Coombs
5435709
5435709

alpine knapweed
Centaurea nigrescens
Plant(s)
Eric Coombs

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: CENI3
Bayer: CENVO
GRIN: 403429
ITIS: 36969
NPDN Pest: PBFARBP

Synonyms and Other Names

Other Common Names:
Tyrol knapweed, short-fringed knapweed, vochin knapweed

Related Scientific Names:

Centaurea debeauxii ssp. thuillieri Gren. & Godr.(Synonym)
Centaurea dubia Suter ssp. vochinensis (Bernh. ex Rchb.) Hayek(Synonym)
Centaurea pratensis Thuill., nom. illeg., non Salisb.(Synonym)
Centaurea transalpina Schleich. ex DC.(Synonym)

Categories

Category: Forbs/Herbs

References

Common Name Reference:

Scientific Name Reference: