Conyza canadensis

Tracheophyta MagnoliopsidaAsteraceaeConyzaConyza canadensis

Ecology

An erect annual of well-drained, open habitats such as pavements, waste places, walls, railway ballast and as a weed of cultivated ground. It is particularly characteristic of urban areas of S. and E. England. It also occurs occasionally on sand dunes and on sandy ground inland. Lowland.

Status

Neophyte

World Distribution

Native of N. America; naturalised throughout Europe and in similar climatic regions almost worldwide.

Broad Habitats

Light (Ellenberg): 7

Moisture (Ellenberg): 4

Reaction (Ellenberg): 7

Nitrogen (Ellenberg): 6

Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.8

July Mean Temperature (Celsius): 16

Annual Precipitation (mm): 766

Height (cm): 100

Perennation - primary

Annual

Life Form - primary

Therophyte (annual land plant)

Woodiness

Herbaceous

Clonality - primary

Little or no vegetative spread

Count of 10km squares in Great Britain: 1048

Count of 10km squares in Ireland: 11

Count of 10km squares in the Channel Isles: 10

Atlas Change Index: 1.12

Weighted Changed Factor: 63

Weighted Change Factor Confidence (90%)

13

JNCC Designations

NHMSYS0000457483