This is very variable, and is usually about a foot high, with several hairy stems, springing from a long yellow root. The leaves are slightly rough, but not coarse, with fine white hairs along the margins, and light gray-green in color, the lowest ones not lobed, a few of the upper ones with two lobes, but most of the leaves, and the bracts, slashed into three lobes. The calyx is covered with white hairs, and the upper lip of the corolla is bright green. The whole plant is most beautiful and harmonious in color, not coarse like many Castillejas, and the upper part is clothed with innumerable delicate yet vivid tints of salmon, rose, and deep pink, shading to scarlet and crimson, forming a charming contrast to the quiet tones of the lower foliage. This grows in gravelly soil, on dry plains and hillsides, and the clumps of bloom are very striking among the sagebrush.

There are a good many kinds of Stemodia, widely distributed, only two in the United States; the corolla blue or purplish and two-lipped; the stamens four, not protruding. This is a rather pretty plant, which is quite effective when growing in quantities. The stem is hairy and sticky, from a foot to a foot and a half tall, with hairy leaves, which have a few sharp teeth. The flowers are three-eighths of an inch long, with sticky-hairy calyxes and bright purplish-blue corollas, white and hairy in the throat. This has a slightly unpleasant, aromatic smell and grows in moist spots, often in mountain canyons near streams, as far east as Texas and also in the tropics.

There are many kinds of Linaria, most abundant in the Old World; herbs; the upper leaves alternate, the lower opposite, usually toothless; the corolla like Antirrhinum, but with a spur; the stamens four, not protruding.