872 
Wilson.—Plant Distribution in the 
The greater part of the vegetation found in the first summer is made 
up of seedlings of biennials and perennials, but amongst these several 
annuals may be found in flower. Anagallis arvensis, L., occurs frequently 
in some spots, and Sonchus asper , Hill, is spread sparingly over the whole 
area. 
The following are occasionally found :— 
Linum catharticum, L. Melampyrum pratense , L. 
Alchemilla arvensis, Scop. Galeopsis Tetrahit , L. 
Gnaphalium uliginosum, L. Polygonum Persicaria , L. 
Senecio sylvaticus, L. Polygonum aviculare , L. 
Lithospermum arvense , L. Juncus bufonius , L. 
Although the great majority of the biennials and perennials of the light 
flora only exist in the vegetative condition during the first season, a few 
may occasionally be found just coming into flower in the late summer of the 
first year. During the latter part of August, 1910, a few flowering plants of 
Hypericum perforatum and Sanicula europaea were found in an area felled 
in the previous January ; solitary plants of Lychnis alba, Mill, and Hypo - 
chaeris radicata , L., were also seen in a similar condition. Hypericum 
humifusum , L., is the only perennial plant discovered in which flowering 
regularly takes place during the season in which it first appears. This 
plant is not abundant on the Clay, but is easily noticeable on account of 
this peculiarity. 
Although plant distribution on the Clay is largely correlated with the 
depth of the deposit, a number of plants are found occurring in equal 
abundance over the whole area. These are included in the following list:— 
Anemone nemorosa , L. Echium vulgare, L. 
Dipsacus sy Ives iris, Huds. Myosotis sylvatica , Hoffm. 
Senecio erncifolius , L. Euphorbia amygdaloides , L. 
The following have a similar distribution and are frequently found :— 
Polygala vulgaris, L. Carduus nutans, L. 
Geranium columbinum, L. Scrophularia nodosa, L. 
Bunium flexiiosum, Fr. Veronica officinalis , L. 
Arctium majus, Bernh. 
Others, while found over the whole area, increase in abundance with 
the increased depth of soil:—• 
Sanicula europaea, L. Nepeta Glechoma , Benth. 
Carduus palustris , L. 
The following are only found on the shallow soil in the near vicinity of 
the Chalk:— 
Linum catharticum, L. Teucrium Scorodonia , L. 
Hypericum hirsutum , L. Habenaria bifolia , R. Br. 
