Dalmatian Toad-flax: Linaria dalmatica ssp. dalmatica (Synonyms: Linaria genistifolia ssp. dalmatica, Linaria jattae, Linaria macedonica) - Leaves ovate to lance-ovate, broad at the base and often clasping. Stems often much branched.
Butter-and-eggs, Common Toad-flax, Greater Butter-and-eggs: Linaria vulgaris (Synonym: Linaria linaria) - Leaves linear, not clasping at the base. Stems rarely branched.