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.
The Sundew family deserves mentioning here, though it is very rare that attempts are made to cultivate any of the species. They are distinguished by their free ovary with numerous seeds on parietal placentas and glandular leaves. Dionaea muscipula, Venus's Flytrap, is sometimes met with. It is a native of North America, and remarkable for the irritability of its leaves, which close upon being touched. Drosophyllum Lusitanicum is a very showy shrubby plant, from Portugal, bearing large terminal corymbs of pale yellow flowers. With the exception of the last-mentioned plant, which grows in sandy places, nearly all the members of this order inhabit boggy or marshy localities. There are three British species of Drosera: D. rotundifolia having spreading orbicular leaves with hairy petioles, and D. Anglica and D. intermedia having oblong-spathulate sub-erect leaves with glabrous petioles; the latter is known by its flower-scapes being curved at the base.