the Soils on which they grow. 157 
all other types of soil except sand. One record of dominance, on heavy 
loam. 
Papaveraceae. Papaver sp. Usually associated with light sandy soils, 
where they were occasionally dominant. Sometimes found on chalk. 
Fumariaceae. Fumaria officinalis . Occurs chiefly on chalk, where it 
is often dominant. Frequently found on sand (with one record of domi- 
nance) ; absent from clay lands. 
Cruciferae. Brassica alha. Characteristic on chalk, where it is very 
often dominant ; frequently occurs on sandy soils, but is very rare on heavy 
land. 
Brassica Sin apis. Found on all types of soil, but most frequently on 
chalk and clay, where it is often dominant. Where it occurs on light soils 
it is usually scarce, though instances of dominance are recorded. 
Capsella Bursa-pastoris. Occurs on all types of soil, but probably more 
frequent on light and sandy land. Rarely dominant. 
Violaceae. Viola tricolor. Practically confined to light and sandy 
soils and chalk. Very rare on clay. Never dominant. 
Caryophyllaceae. Cerastium vnlgatum . Apparently distributed on 
all types of soil, but never very prevalent. 
Spergula arvensis. Confined to sand and very light sandy soil. Fre- 
quently dominant. 
Stellaria media. Chiefly found on sandy and light soils. Recorded 
from clay, chalk, and black land. When dominant it was usually on light 
and sandy soils. 
Geraniaceae. Geranium sp. (It was difficult to absolutely fix the 
species in some cases.) 
G.pusillum and G. molle. Only occurred on chalk and sand. Rarely 
dominant. 
G. dissectum. Found on light loam. 
This genus is practically confined to temporary leys of clover or ‘ seeds ’. 
Rubiaceae. Sherardia arvensis. Practically confined to chalk. 
Galium Aparine. Of general occurrence, but possibly more frequent 
on light lands than on heavy soils. It rarely occurs in any quantity, but is 
usually occasional or scarce. 
Compositae. A nthemis arvensis and A. Cotula. (Species were not 
clearly separated in the field.) Recorded from both light and heavy soils, 
but infrequent in occurrence in this area. 
Chrysanthemum segetum. Only found on sand ; very local, but charac- 
teristic. 
Gnaphalium uliginosum . Usually associated with light sandy soils ; 
never seen on chalk, and only once on clay. It seldom occurred in any 
quantity. (There is just a possibility that this represents a mistaken dia- 
gnosis of a certain small form of Filago gallica , which much resembles 
