Plant indicators of Siliceous soils

1181. Siliceous. Three-leaved speedwell (Veronica triphyllos) and vernal (verna), Italian viper's bugloss (E'chium italicum), smooth rupture-wort (Herniaria glabra) and hairy (hirsuta), English catchfly (Silene anglica) and other species, red sandwort (Arenaria rubra), &c., corn-field spurrey (Spergula arvensis), hybrid poppy (Papaver hybridum), argemone, &c.