146 Brenchley . — The Weeds of Arable Land . III. 
Veronica Tournefortii 1 {V. Buxbaumii). Found on all types of soil, 
including chalk. Occasionally dominant. 
Lamiaceae. Galeopsis Tetrahit. Characteristic of the lighter soils. 
Rare on chalk. 
Mentha arvensis. Occurred on all types of soils, but especially on 
heavy loam. Twice dominant on loam. 
Satureia Acinos. Chiefly associated with chalky soils. Never 
dominant. 
Plantaginaceae. Plantago lanceolata. Distributed over all types of 
soil and occasionally dominant. 
Plantago major (probably including var. inter medid). Universally dis- 
tributed as to soil. Never dominant. 
Illecebraceae. Scleranthus animus . Confined to sandy soils ; never 
on chalk. Frequently dominant on sand. 
Chenopodiaceae. Chenopodium album. Distributed over all soils and 
occasionally dominant. 
Polygonaceae. Polygonum aviculare. Very common on all soils 
and often dominant. 
Polygonum Convolvulus. As common as P. avictdare , but generally 
associated with loam and sand. Seen on chalky loam, but never on chalk. 
Frequently dominant. 
Polygonum Persicaria. Practically confined to light sandy soils, though 
one instance of dominance was on clay. (This species often came in if any 
part of the field happened to be rather damp.) 
Rumex Acetosella. Only found on sand and light loam ; never asso- 
ciated with chalky soils. Sometimes dominant on sand. 
Rumex crispus. Distributed over all soils and occasionally dominant. 
(Most Norfolk farmers say that this is the worst weed they have to deal 
with, but such constant war is waged against it that it is by no means 
conspicuous in the fields.) 
Rumex obtusifolius. Only seen on sandy soils. Once dominant. 
Euphorbiaceae. Euphorbia exigua. Chiefly found on clay and the 
heavier loams. Never dominant, often scarce. 
Euphorbia Helioscopia. Usually on chalk and calcareous soils. Occa- 
sional or scarce in distribution. 
Graminaceae. Agropyron repens (Triticum repens'). Chiefly on heavy 
land, but also found on all soils except chalk. Frequently dominant. 
Agrostis alba (including var. stolonifera). Associated with all soils. 
Frequently dominant. 
Alopecurus myosuroides (A. agrestis). Characteristic of heavy loams 
and clay ; never seen elsewhere. Once dominant on clay. 
Poa annua. Chiefly on loam and sandy loam ; rare on chalk. Once 
1 See note on p. 145. 
