The only kind, a fine plant, well worth cultivation; smooth and branching, about two feet tall, with handsome, bluish-green leaves, with a "bloom," the root-leaves with long, purplish leaf-stalks and sometimes nine inches long; the flowers half an inch across, with a lilac-tinged calyx and white petals, prettily toothed, forming a pretty, rather flat-topped cluster. The pods are very slender, nearly straight, one or two inches long. This grows among rocks, in protected situations, and is not common. Only a few, separate flowers are given in the picture, as the plant I found, near the Desert Laboratory at Tucson, was almost out of bloom.
Dryopetalon runcinatum.
Golden Prince's Plume—Stanleya pinnatifida.
There are a good many kinds of Lesquerella, all American; low plants, more or less hairy or scurfy; flowers mostly yellow, in clusters; petals without claws; pods roundish, more or less inflated, and giving the common name, Bladder-pod, also used for Isomeris arborea.
White Bladder-pod
Lesquerélla purpùrea
White, pink
Spring Arizona
Pretty little plants, often growing in quantities among rocks in mountain canyons. The slender stems are from a few inches to over a foot tall, springing from a cluster of root-leaves, varying a good deal in shape, dull-green and harsh to the touch. The flowers are half an inch or more across, with white petals, often tinged with pink, with a little yellow in the throat, and form a pretty, rather flat-topped cluster.
Yellow Bladder-pod Lesquerélla Arizònica
Yellow
Summer
Arizona
In desert places, such as the terrible sandy wastes of the Petrified Forest, where it seems a miracle that anything should grow, we find the close, pale, gray-green tufts of this little plant, crowned with racemes of small bright-yellow flowers. The small, thickish leaves are long, narrow and white with close down, the stems, about three inches high, branch at the root and the little pods are tipped with a style of about their own length. L. Gordóni, of Arizona, also has clusters of little yellow flowers, often covering sandy hillsides with bright color; the leaves slightly stiff and rough, the pods much inflated. It resembles L. purpurea in general form and size.
There are many kinds of Brassica, coarse "weeds" in this country. This is the ancient Latin name for Cabbage, which belongs to this genus, as well as Cauliflower, Turnip, and Brussels Sprouts.
Black Mustard
Brássica nìgra
Yellow
Summer
U. S.