This section is from the book "Wayside And Woodland Blossoms", by Edward Step. Also available from Amazon: Wayside And Woodland Blossoms: A Guide To British Wild-Flowers.
Holosteum umbellatum. - Garyophylleae. -
This is a very rare plant, occurring only on old walls about Norwich, Bury and Eye. The rambler in those localities might pass it by as a variety of the vulgar Chickweed, to which, however, it is distantly related. The small white, flowers are arranged in an umbellate manner, though not forming a true umbel. Whilst flowering the long pedicels are erect, but after flowering they hang down; after fruiting they become erect again. Flowers April and May.
Name derived from the Greek olos, all, and osteon, bone, but Artemus Ward would have said it was "wrote sarcastick," for there is nothing suggestive of bones in so soft a plant.