This section is from the book "Handbook Of Hardy Trees, Shrubs, And Herbaceous Plants", by W. Botting Hemsley. Also available from Amazon: Handbook of hardy trees, shrubs, and herbaceous plants.
Herbs or undershrubs, usually glabrous. Leaves impari-pinnate. Flowers yellow or purple or pink and white, variegated, umbellate on long axillary peduncles, keel acute or beaked. Pod round, tetragonal or flattened, with oblong joints. About twenty species, chiefly from the Mediterranean region. The name is a diminutive of corona, a crown. C. glauca is the common greenhouse species.
1. C. Emerus. Scorpion Senna. - An erect deciduous shrub 3 to 6 feet high. Leaflets 7 to 9, obovate. Peduncles usually 2- to 3-flowered; flowers red and yellow, appearing throughout the Summer. Claws of the petals three times as long as the calyx. Europe.
2. C. montana (fig. 72), syn. C. coronata. - Herbaceous, about 18 inches high. Leaflets glaucous, rather fleshy, the lowest pair close to the base of the petiole. Flowers yellow, from 15 to 20 in each umbel. Claws of the petals about equalling the calyx. A native of Switzerland.
3. C. varia. - A very pretty her-baceous species, growing from 1 to 3 feet high, and bearing a profusion of pink and white flowers; the keel being usually white. Leaflets about 11, oblong, obtuse. Umbels about 20-flowered. Plants are occasionally seen with the flowers wholly white or purple. Native of Europe, flowering in Summer.
4. C. minima. - A dwarf diffuse suffruticose plant with minute stipules. Leaflets 7 to 9, oblong or obovate, the lowest pair near the base of the petiole. Flowers yellow, 5 to 8 in each umbel. One of the best of the hardy yellow-flowered species. South of Europe, blooming in June and July.
5. C. Iberica. - Similar to the last. Leaves composed of 7 to 9 obcordate hairy leaflets. Flowers yellow, about 5 to 8 in each umbel. A native of Spain, flowering in Summer.
Fig. 72. Coronilla montana. (1/4 nat. size.)