I. Severn.—This sub-district comprises Upper Arley, Kinver, Enville, Dudley and Sedgley, with much of the country W. and N.W., of Wolverhampton. The Coal measures extend over a considerable area, and Silurian limestones and shales occur about Sedgley and Dudley.
The more interesting plants are:—
Ranunculus circinatus, R. fluitans, R. parviflorus; Berberis vulgaris; Sinapis nigra; Cardamine amara, C. impatiens; Teesdalia nudicaulis; Viola palustris; Saponaria officinalis; Silene Anglica; Cerastium arvense; Sagina ciliata; Hypericum Androsæmum, H. dubium, H. humifusum; Geranium pyrenaicum, G. columbinum; Erodium moschatum, E. maritimum; Euonymus Europæus; Rhamnus catharticus; R. Frangula; Genista tinctoria; Ulex Gallii; Melilotus officinalis; Ornithopus perpusillus; Vicia sylvatica, V. lathyroides; Prunus insititia, P. Padus; Sanguisorba officinalis; Potentilla argentea; Comarum palustre; Pyrus Malus, var. mitis; Saxifraga granulata; Chrysosplenium alternifolium; Helosciadium inundatum; Œnanthe fistulosa, Œ. crocata; Torilis nodosa; Chærophyllum Anthriscus; Viscum album; Viburnum Opulus; Carduus nutans, C. eriophorus, C. pratensis; Carlina vulgaris; Gnaphalium sylvaticum; Doronicum Pardalianches; Inula Conyza; Solidago virga-aurea; Hypochæris glabra; Leontodon hirtus; Picris hieracioides; Helminthia echioides; Hieracium umbellatum; Campanula Rapunculus, C. patula; Monotropa hypopitys; Gentiana Amarella; Chlora perfoliata; Atropa Belladonna; Verbascum Thapsus, V. Lychnitis, V. Thapso-lychnitis; Linaria Elatine; Limosella aquatica; Mimulus luteus; Nepeta Cataria; Scutellaria minor; Galeopsis Ladanum; Echium vulgare; Lithospermum officinale; Myosotis sylvatica; Cynoglossum officinale; Parietaria officinalis; Ulmus montana; Chenopodium polyspermum; Salix decipiens, S. cærulea, S. vitellina, S. undulata, S. purpurea, S. Woolgariana, S. acuminata, S. laurina; Sparganium neglectum; Orchis mascula, O. Morio, O. latifolia; Epipactis latifotia; Colchicum officinale; Carex pulicaris, C. pallescens, C. strigosa, C. pendula; Poa nemoralis; Nephrodium Thelypteris; Botrychium Lunaria; Lycopodium clavatum.
II. Trent.—Comprises much of the country lying N. and N.E. of Wolverhampton, including Codsall, Penkridge, Cannock Chase, Rugeley, Abbotts Bromley and Alrewas. Much of this sub-district has a sub-Alpine character in its physical features and flora, and is beautifully undulated throughout. The rocks are mainly Triassic, but the coal measures prevail over a considerable area. The more rare plants are:—
Thalictrum flavum; Ranunculus circinatus, R. trichophyllus, R. Drouetii, R. Baudotii v. confusus, R. Lenormandi, R. flamula var. pseudo-reptans, R. Lingua, R. hirsutus, R. parviflorus; Caltha Guerangerii; Actæa spicata; Papaver Rhæas v. strigosum; Chelidonium majus; Thlaspi arvense; Erysimum cheiranthoides; Arabis perfoliata; Nasturtium amphibium; Viola palustris, V. Reichenbachiana; Drosera rotundifolia; Polygala depressa; Tilia parvifolia; Montia fontana; Prunus Padus; Potentilla argentea; Rubus rhamnifolius, R. villicaulis, R. Schlechtendalii, R. Sprengelii, R. Bloxamii, R. rosaceus, R. infestus, R. Guntheri, R. Bellardii; Rosa scabriuscula, R. tomentella; Epilobium roseum; Hippuris vulgaris; Chrysosplenium alternifolium; Hydrocotyle vulgaris; Œnanthe fistulosa, Œ. Phellandrium; Bidens cernua, B. tripartita; Hieracium maculatum; Wahlenbergia hederacea; Vaccinium Oxycoccus, V. Vitis-Idæa, V. Myrtillus; Menyanthes trifoliata; Mentha piperita; Lamium Galeobdolon; Myosotis palustris; Pinguicula vulgaris, Lysimachia Nummularia; Anagallis tenella; Polygonum Bistorta; Rumex maritimus; Empetrum nigrum; Salix pentandra, S. triandra, S. Forbyana, S. Smithiana, S. holosericea, S. hyppophaefolia; Typha angustifolia; Potamogeton lucens; Fritillaria Meleagris; Narthecium ossifragum; Scirpus lacustris, S. sylvaticus; Eriophorum angustifolium, E. vaginatum; Carex dioica, C. curta, C. disticha, C. muricata, C. pilulifera, C. binervis, C. pseudo-Cyperus, C. vesicaria, C. ampullacea; Calamogrostis Epegeios; Milium effusum; Molinia cærulea; Avena pubescens, A. fatua; Triticum caninum; Nardus stricta; Osmunda regalis.
III. Tame.—This sub-district, includes Walsall, Lichfield, Shenstone, Barr and Handsworth. The surface rocks are Trias, Permian and Coal measures, and the limestones of Walsall, Rushall, and Hay Head. The greatest elevation is Barr Beacon. Both the source and the mouth of the Tame are within the limits of this sub-district. The principal plants are:—
Thalictrum flavum; Arabis perfoliata; Cardamine amara, C. impatiens; Nasturtium sylvestre; Teesdalia nudicaulis; Reseda Luteola; Silene noctiflora; Malva moschata, M. rotundifolia; Erodium cicutarium; Genista Anglica; Lathyrus Nissolia; Orobus tuberosus; Prunus insititia, P. Padus; Geum rivale; Rosa subglobosa, R. micrantha, R. collina; Rubus suberectus, R. rharmnifolius; Pyrus Aria; Sedum Telephium; Saxifraga granulata; Chrysosplenium alternifolium; Parnassia palustris; Helosciadium repens; Myrrhis odorata; Apium graveolens; Œnanthe crocata; Dipsacus pilosus; Valerianella dentata; Galium Witheringii; Carduus nutans, C. pratensis; Anthemis nobilis; Erigeron acris; Campanula Trachelium, C. latifolia, C. patula; Solanum nigrum; Linaria minor; Veronica Buxbaumii, V. montana, V. scutellata, V. Anagallis; Limosella aquatica; Pinguicula vulgaris; Utricularia vulgaris; Lysimachia vulgaris; Centunculus minimus; Parietaria officinalis; Ulmus montana; Salix pentandra; Acorus Calamus; Epipactis palustris; Convallaria majalis; Typha angustifolia; Lemna gibba; Narthecium ossifragum; Colchicum autumnale; Scirpus sylvaticus, S. cæspitosus; Carex pallescens, C. pseudo-Cyperus; Calamagrostis Epegejos, C. lanceolatus; Milium effusum; Avena pubescens; Triticum caninum; Asplenium Ruta-muraria; Aspidium lobatum; Osmunda regalis.