The vivid glowing orange of these handsome flowers is exceedingly effective among the dark tree-trunks of the mountain forests where they often grow. They are widely distributed as far east as Ohio. The stout, purplish stems are from one to two feet tall and the long, narrow leaves, often toothed, are apt to be purplish on the under side, and both stem and leaves are rather rough.
The fragrant flowers, each about three-quarters of an inch across, form a handsome cluster, about three inches across. The calyx is yellow, the pistil green, and the anthers brown. The conspicuous, four-sided pods are spreading or erect, from one to five inches long, with a stout beak. In the high mountains the orange-color gives way to the variety perenne, with lemon-colored flowers, perhaps commoner than the orange, not so tall, and wonderfully handsome in the Wasatch Mountains, around Mt. Rainier and similar places, and widely distributed. The Cream-colored Wallflower, E. capitatum, blooms early, growing near the coast; the flowers large, handsome, but not sweet-scented.
Erysimum asperurn. Western Wall-flower.
There are a good many kinds of Thlaspi, of temperate and arctic regions: smooth low plants, mostly mountain; root-leaves forming a rosette; stem-leaves more or less arrow-shaped and clasping; flowers rather small, white or purplish; sepals blunt; style slender, sometimes none, with a small stigma; pod flat, roundish, wedge-shaped, or heart-shaped, with crests or wings.