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A. lyrata ssp. petraea growing on abandoned castle walls. © Steven Ansell
Arabidopsis lyrata consists of several closely related species or subspecies. The number of units historically recognised has varied and the most recent taxonomic revision (Al-Shehbaz & O’Kane 2002) recognises one species and three subspecies:
A detailed taxonomic account is provided in Al-Shehbaz & O’Kane 2002, including a full list of synonyms.