Centaurea nigra L.Captura: Camí de Sitjar, Camprodon, Ripollès, Girona, Catalunya
ENGLISH
Centaurea nigra is a species of flowering plant in the daisy family known by the common names lesser knapweed, common knapweed and black knapweed. A local vernacular name is hardheads.
It is native to Europe but it is known on other continents as an introduced species and often a noxious weed.
Although the plant is often unwanted by landowners because it is considered a weed by many, it provides a great deal of nectar for pollinators. It was rated in the top five for most nectar production (nectar per unit cover per year) in a UK plants survey. It also placed second as a producer of nectar sugar per floral unit, among the meadow perennials, in another study in Britain.
It is a herbaceous perennial growing up to about a metre in height.
The leaves are up to 25 centimetres (9.8 in) long, usually deeply lobed, and hairy. The lower leaves are stalked, whilst the upper ones are stalkless.
The inflorescence contains a few flower heads, each a hemisphere of black or brown bristly phyllaries. Each head bears many small bright purple flowers. The fruit is a tan, hairy achene 2 or 3 millimetres long, sometimes with a tiny, dark pappus. It flowers from July until September. The flowers sometimes are yellow or white.
WIKIPEDIA
Centaurea nigra L.Captura: Camí de Sitjar, Camprodon, Ripollès, Girona, Catalunya
ENGLISH
Centaurea nigra is a species of flowering plant in the daisy family known by the common names lesser knapweed, common knapweed and black knapweed. A local vernacular name is hardheads.
It is native to Europe but it is known on other continents as an introduced species and often a noxious weed.
Although the plant is often unwanted by landowners because it is considered a weed by many, it provides a great deal of nectar for pollinators. It was rated in the top five for most nectar production (nectar per unit cover per year) in a UK plants survey. It also placed second as a producer of nectar sugar per floral unit, among the meadow perennials, in another study in Britain.
It is a herbaceous perennial growing up to about a metre in height.
The leaves are up to 25 centimetres (9.8 in) long, usually deeply lobed, and hairy. The lower leaves are stalked, whilst the upper ones are stalkless.
The inflorescence contains a few flower heads, each a hemisphere of black or brown bristly phyllaries. Each head bears many small bright purple flowers. The fruit is a tan, hairy achene 2 or 3 millimetres long, sometimes with a tiny, dark pappus. It flowers from July until September. The flowers sometimes are yellow or white.
WIKIPEDIA