gb, hertfordshire, capsella bursa-pastoris, poa annua, senecio vulgaris, vicia hirsuta, vicia sativa, plantago lanceolata, veronica arvensis, stellaria media, viola arvensis, arabidopsis thaliana, convolvulus arvensis, chenopodium album, cirsium arvense, rumex acetosella, polygonum aviculare, bromus sterilis, achillea millefolium, galium aparine, bromus hordeaceus, geranium molle, lolium perenne, tripleurospermum inodorum, lysimachia arvensis, trifolium repens, urtica dioica, papaver rhoeas, draba verna, matricaria discoidea, veronica hederifolia, lamium purpureum, rumex angiocarpus, dactylis glomerata, cerastium glomeratum, veronica persica, agrostis capillaris, arenaria serpyllifolia, trifolium dubium, medicago lupulina, myosotis arvensis, erodium cicutarium, sisymbrium officinale, arrhenatherum elatius, aphanes arvensis, sonchus asper, centaurea cyanus, fallopia convolvulus, sonchus oleraceus, geranium dissectum, plantago major, elymus repens