BIOLOGICAL FLORA OF THE BRITISH ISLES.

The article focuses on the spergula arvensis, a biological flora of the British Isles. It describes the spergual arvensis which has an annual herb with ascending geniculate stems, with 10 or fewer stamens, and the species is very variable. It is stated that the species is native and a locally abundant calcifuge weed of arable land, particularly on light sandy soils and offers information which includes the geographical and altitudinal distribution, habitat, its history of the species. It also presents several tables that show the variation in number of stamens per flower, relation between soil texture and occurrence of the species and number of fields in which the listed species were in abundant in association with spergula arvensis.