Lactuca virosa

Tracheophyta MagnoliopsidaAsteraceaeLactucaLactuca virosa

Ecology

An annual or biennial herb, sensitive to grazing, occurring as a native on coastal cliffs, inland rock outcrops and perhaps sand dunes, but much more widespread as a plant of rank calcareous grassland, woodland margins, road-banks, quarries, tracks and rough ground. Lowland.

Status

Native

World Distribution

Suboceanic Southern-temperate element.

© G. Toone, IWNHAS

Broad Habitats

Light (Ellenberg): 8

Moisture (Ellenberg): 4

Reaction (Ellenberg): 7

Nitrogen (Ellenberg): 7

Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.6

July Mean Temperature (Celsius): 16

Annual Precipitation (mm): 693

Height (cm): 200

Perennation - primary

Biennial, including monocarpic perennials

Perennation - secondary

Annual

Life Form - primary

Hemicryptophyte

Woodiness

Herbaceous

Clonality - primary

Little or no vegetative spread

Count of 10km squares in Great Britain: 650

Count of 10km squares in Ireland: 3

Count of 10km squares in the Channel Isles: 0

Atlas Change Index: 1.16

Weighted Changed Factor: 66

Weighted Change Factor Confidence (90%)

23

JNCC Designations

NBNSYS0000004535