Erysimum Allionii, also known as Allioni's Wallflower, is a perennial flowering plant native to Southern Europe. The plant is popular for its vibrant yellow flowers and its spicy fragrance. While Erysimum Allionii is the plant's official botanical name, it has several synonyms that are commonly used for the same species. These synonyms include Cheiranthus cheiri, Erysimum cheiri, and Cheiranthus allionii. These names are often used interchangeably, referring to the same plant species. Erysimum Allionii is a popular garden plant and is often used to add colour and fragrance to outdoor spaces.