Erysimum menziesii is a species of wallflower known by the common name Menzies' wallflower. This rare plant is endemic to California. It is found only in the declining beach sand dune habitat in three areas on California coastline, in Humboldt, Mendocino, and Monterey Counties. It is listed as an endangered species on the California state and federal levels. There are three to four subspecies depending on the authority, and each is rare. Erysimum menziesii is a mustardlike biennial or perennial herb which is short in size, reaching maximum heights of usually not more than 15 centimeters. The leaves are long and straight along the stem, and often thicker, hairier, and lobed in shape at the base. The top of the stem is occupied by a thick bunch of flowers with bright yellow, rounded petals. The flowers fall away to leave behind the fruits, which are very long siliques sticking straight out. The plant can vary in appearance, particularly across subspecies. At least one subspecies is pollinated by the similarly distressed bee Emphoropsis miserabilis. The plant has high fecundity, but very low seedling survivorship, with over 98% of seedlings perishing within the first year. At least one subspecies is commonly infected with the white rust fungus Albugo canadensis.