An annual or short-lived perennial herb, found mainly as a casual of waste ground, but now becoming naturalised in a variety of habitats where it is sometimes invasive, such as in open grassland. It is introduced with grain and bird-seed. Lowland.
R. rugosum was introduced to cultivation in Britain by 1739, and was known from the wild by at least 1863. Its range has increased since the 1962 Atlas.
Native of the Mediterranean region and S.W. Asia; widely naturalised in temperate Europe and in the S. hemisphere.
Atlas Change Index: 0.19
Atlas text references
Jalas & Suominen (1996)
1965. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 1. 2 vols.
1991. Crucifers of Great Britain and Ireland. Botanical Society of the British Isles Handbook no. 6.