Aira praecox

Tracheophyta MagnoliopsidaPoaceaeAiraAira praecox


An annual of sandy, gravelly and rocky places, commonly on thin acidic soils around rock outcrops, on walls, cliff-tops, heaths and sand dunes. It is rarely recorded as a wool casual. Generally lowland, but reaching 685 m on Mangerton Mountain (S. Kerry).



World Distribution

Suboceanic Southern-temperate element; widely naturalised outside its native range.

Broad Habitats

Light (Ellenberg): 8

Moisture (Ellenberg): 2

Reaction (Ellenberg): 4

Nitrogen (Ellenberg): 2


Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.5

July Mean Temperature (Celsius): 14.3

Annual Precipitation (mm): 1149

Life form information

Height (cm): 10

Perennation - primary


Life Form - primary

Therophyte (annual land plant)



Clonality - primary

Little or no vegetative spread

Distribution information

Count of 10km squares in Great Britain: 2450

Count of 10km squares in Ireland: 659

Count of 10km squares in the Channel Isles: 13

Atlas Change Index: -0.19

Weighted Changed Factor: -14

Weighted Change Factor Confidence (90%)


Distribution information

JNCC Designations


PLANTATT - Attributes of British and Irish plants. (.zip 1455KB) This dataset was compiled and published in 2004, and last updated in November 2008. Download includes an Excel spreadsheet of the attributes, and a PDF explaining the background and nomenclature. Note that the PDF version is the booklet as published, whereas the Excel spreadsheet incorporates subsequent corrections. A hardcopy can be purchased from the Centre for Ecology and Hydrology.

Atlas text references