Time of bloom: June to July.
Seed-time: Hips ripe in autumn but retained until winter.
Range: Manitoba, Minnesota, and the Dakotas, southward to
In spite of its beauty this plant is considered a bad weed throughout its range, for, though itself but one or two feet tall, it has long, deep-running, branching, underground stems, which, from the axils of their scales, send up many flowering shoots. It is especially troublesome in grain fields and is now established in a number of eastern localities, the seeds having been an impurity of western oats.
Stem erect, slender, bristling with very thin, fine prickles. Leaflets seven to eleven, obovate, finely and sharply toothed, smooth on both sides, seldom more than an inch long; stipules long and narrow, sometimes toothed above, and more or less glandular. Flowers pink, large, often more than two inches broad, occasionally solitary but usually growing in open corymbose clusters. Hips globular, smooth, about a half-inch in diameter, crammed with hard, hairy achenes. (Fig. 156.)
Fig. 156.- Prairie Wild Rose (Rosa arkansana). X 1/4.
If the plants are young and few, grub out the colonies, securing, if possible, every shred of the rootstocks; in ground rankly infested, cut the stalks from the rootstocks with a very sharp-bladed plow in the hot days of July. New shoots will promptly appear, which, at intervals of not more than two weeks - ten days would be better - must be disked, or cut off with a sharp and broad-bladed cultivator, in order to keep leaf growth from feeding the rootstocks. Next season put in a cultivated crop of which the tillage will constantly keep the shoots cut off, and so starve the underground stems.