It is not known how this population was introduced into Humboldt County, but it may have been brought in on construction equipment, with imported fill, or in horse manure. Efforts are currently underway to prevent this species from invading nearby natural dunes and to eliminate the entire population if possible. Two federally listed species, Erysimum menziesii subsp. Stems are prostrate to erect, branched, and up to 1m tall. The amount of lobing on the leaves decreases from the base of the plant to the base of the racemose inflorescence.
Flowers have bright yellow petals with pale brown or violet veins.
There are no bracts on the inflorescences. The entire, mature fruit is 3.5-8.5 cm in length. The fruiting pedicel is rarely erect. The fruit contains a single row of 8-10 seeds. Seeds are subspherical to oblong and can be black or brown in color.