Centaurea nigra

From Bugwoodwiki
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Taxonomy
Kingdom:
Plantae
Phylum:
Magnoliophyta
Class:
Magnoliopsida
Order:
Asterales
Family:
Asteraceae
Genus:
Centaurea
Species:
C. nigra
Scientific Name
Centaurea nigra
L.
Scientific Name Synonyms
Centaurea jacea ssp. nigra
(L.) Bonnier & Layens
Common Names
black knapweed, black knapweed

Overview

Appearance
Centaurea nigra is a perennial plant that can grow from 1-3 ft. (0.3-0.9 m) tall.
Foliage
Leaves, near the base, are petiolate, oblanceolate, shallowly dentate and 2-10 in. (5-25 cm) long. As leaves move up the stem, they become smaller, sessile, linear, and entire.
Flowers
Flowering occurs from June to October, when purple (rarely white) flowers appear in heads at the tips of the branches.
Fruit
Fruit is a tan, hairy achene 0.08-0.12 in. (2-3 mm) long, may have a small, dark pappus.
Ecological Threat
Centaurea nigra is native to Europe and was first found in the United States in 1895 in Pullman, Washington. Preferred habitat includes roadsides, waste places, fields and clearings.

Resources

Images from Bugwood.org


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