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.
This genus is very near the last, but most of the species are woody at the base. The main distinction, however, is in the seed-vessel, which opens in valves with the seed-bearing placentas attached to them. The name is from Sis, double, and a placenta, referring to the separation of the placenta into two parts.
1. D. glutinosus, syn. Mimulus glutinosus. - A robust growing perennial from 2 to 3 feet high, with funnel-shaped almost regular flowers, orange-coloured in the original variety. But since its introduction, about a century since, it has given birth to several marked varieties which have been described as distinct species. They may be reduced to four principal forms: D. aurantiacus, orange-coloured flowers, having the lobes of the corolla emarginate; D. puniceus, cinnabar flowers with emarginate lobes; D. latifolius, yellow flowers, larger broader leaves, and rounded corolla-lobes; and D. grandiflorus, remarkable for the unusual development of the limb of the corolla, and its deeply bilobate divisions. The colour here is rather variable, ranging in every shade from pure white to nankeen yellow, uniform, or covered with spots. This species is from California, and somewhat tender.
Sibthorpia Europaea is an interesting slender creeping herb with minute reniform hairy leaves and solitary axillary flowers. It is found here and there in the South and West of England and Ireland. This rapidly covers the ground in damp shady places.