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.
Decumbent densely hairy annual or perennial herbs with small white flowers and bifid petals. Forty species, natives of the temperate and cold parts of the whole world. Name from kepas a horn, from the horn-like capsule.
1. G. tomentosum. - This is the species in general use for edging. Its small leaves are densely clothed with a greyish or nearly white tomentum. South of Europe.
2. G. Biebersteini. - A similar but larger plant with less silvery leaves. A native of the Crimea.
C. triviale, C. glomeratum, and Stellaria media, Chickweed, a closely allied plant, are exceedingly common garden and corn-field weeds. Stellaria Holostea is a common hedgerow perennial of weak straggling habit, with large pure white flowers having deeply lobed petals.