Western Wallflower (Erysimum capitatum)
A perennial native growing about 12 inches tall and is conspicuous do to the upper half being covered with numerous bright yellow flowers. Flowers have four petals and are about 3 to 4 of an inch wide. It begins to bloom in April. Prefers sunny and dry conditions. The species can be found from southern Canada to New Mexico and through many of our eastern states.