176 Stcipledon. — On the Plant Communities of Farm Land . 
chiefly on ( a ) the season, (b) the soil, (c) the appropriateness of the seed 
mixture used. 1 In dry seasons and on poor soils the ‘ take’ is likely to be 
poor, in consequence of which the weed flora will include a number of 
species not usually associated with good leys. The following synopsis may 
be given of the weeds met with under ‘ seeds ’ : 
(a) Those which do not occur elsewhere in the rotation. 
Cuscuta racemosum * j 
Trifolium agrarium * > (Mid- Wales). 
Cichorium Intybus * ) 
Cnicus lance olatus * (Mid- Wales and Cotswolds). 
(b) Those which under good ‘ takes ’ are normally found to have high 
frequencies — frequencies for many of the species higher than found 
elsewhere in the rotation. 
Ranunculus repens .* 
Viola tricolor (agg.). 
Arenaria serpyllifolia. 
Cerastium spp.* 
Geranium molle.* 
G. dis sec turn .* 
Erodium cicittarium . 
A Icliemilla arvensis . 
Trifolium minus* 
(c) On poor soils and under moderate ‘ takes ’ the following are frequent : 
Lotus uliginosus (Mid-Wales on wet soils). 
Chrysanthemum leucanthemum * (Mid- Wales and Cotswolds). 
Veronica agrestis (Mid-Wales). 
Rtimex Ace to sella * (Mid-Wales, especially on peat). 
Holcus lanatus * (Mid-Wales and Cotswolds). 
Bromus hordeaceus (Cotswolds). 
Agrostis spp. (Mid- Wales). 
Beilis perennis . 
Cnicus lance olatus.* 
Hypochoeris radicata .* 
Taraxacum officinale.* 2 
Myosotis arvensis* 
Veronica serpyllifolia. 
Prunella vulgaris.* 
Plan tago lanceolata . * 
( d ) In dry seasons and wherever the ‘ take } may have been for any reason 
very poor the following are prone to occur : 
Capsella Bursa-pastoris. 
Fumaria officinalis (Cotswolds). 
Stellaria media.* 
Galium Aparine.* 
Veronica hederaefolia (Cotswolds). 
Polygonum Persicaria.* 
P. avicidarc. 
Euphorbia Helioscopia. 
Agropyron repens . 
1 This point will be dealt with at length under grass-land. See Part II. 
2 This plant has been noted by Brenchley to be absent or rare under ‘ seeds’ j this is by no means 
the case in Mid- Wales. 
