Knautia arvensis

Tracheophyta MagnoliopsidaDipsacaceaeKnautiaKnautia arvensis

Ecology

A perennial herb of calcareous and neutral grassland on well-drained, especially basic soils. It is found in chalk and limestone grassland, in rough pasture, open hedgerows and wood borders, and as a colonist on roadside verges, railway embankments and grassy waste ground. It is also a locally common weed of cultivation, especially in field-borders on the chalk. 0-365 m (Derbys.).

Status

Native

World Distribution

Eurosiberian Temperate element; widely naturalised outside its native range.

© P. Shannon

Broad Habitats

Light (Ellenberg): 7

Moisture (Ellenberg): 3

Reaction (Ellenberg): 8

Nitrogen (Ellenberg): 4

Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.8

July Mean Temperature (Celsius): 15.2

Annual Precipitation (mm): 919

Height (cm): 100

Perennation - primary

Perennial

Life Form - primary

Hemicryptophyte

Woodiness

Herbaceous

Clonality - primary

Little or no vegetative spread

Count of 10km squares in Great Britain: 1707

Count of 10km squares in Ireland: 478

Count of 10km squares in the Channel Isles: 4

Atlas Change Index: -0.88

Weighted Changed Factor: -19

Weighted Change Factor Confidence (90%)

15

JNCC Designations

NHMSYS0000460024