| Echium italicum, L. | S. Europe | … | S. | |
| Chenopodium olidum, Curt | England | T. | ||
| polyspermum, L. | England | … | S. | |
| urbicum, L. | England | T. | S. | |
| murale, L. | England | … | … | H. |
| hybridum, L. | England | T. | S. | |
| ficifolium, Sm. | England | T. | S. | |
| glaucum, L. | England | T. | S. | H. |
| Amaranthus blitum, L. | England | T. | S. | |
| Blitum virgatum, L. | S. Europe | … | … | H. |
| Atriplex pedunculata, L. | England | … | S. | |
| hortensis, L. | Asia | |||
| Schoberia fruticosa, Mey | England | T. | ||
| Polygonum fagopyrum, L. | Cultivated | T. | S. | |
| Rumex maritimus, L. | England | T. | S. | H. |
| palustris, Sm. | England | T. | S. | |
| Euphorbia amygdaloides, L. | England | … | … | H. |
| spinosa, L. | S. Europe | |||
| Pedilanthus tithymaloides, Poir | S. America | |||
| Mercurialis annua, L. | England | … | … | H. |
| Urtica pilulifera, L. | England | T. | S. | |
| Cannabis sativa, L. | Asia | |||
| Digitaria sanguinalis, Scop. | S. Europe | … | S. | |
| Setaria verticillata, Beauv. | England | … | S. | |
| viridis, Beauv. | England | T. | S. | |
| Polypogon monspeliensis, Desf. | England | … | S. | |
| Phalaris canariensis, L. | England | T. | S. | H. |
| paradoxa, L. | S. Europe | |||
| Cynosurus echinatus, L. | S. Europe | T. | S. | |
| Bromus arvensis, M. and K. | England | T. | … | H. |
| madritensis, L. | England | … | S. | |
| maximus, Desf | England | … | S. |
II.
SUMMARY.
1. — Adapting the Northumberland and Durham list to the standard as regards specific limits of Watson's Cybele Britannica we claim for the two counties taken together nine hundred and thirty-five species out of the one thousand four hundred and twenty-five which are yielded by the whole of Britain, exclusive of Ireland, and besides these we have enumerated two hundred and four casual introductions, eighty-seven of which are stray garden plants, or occasional corn-field weeds, the other one hundred and seventeen plants introduced with ballast.
2. — Out of these nine hundred and thirty-five species which we consider we may fairly claim for the two counties, at least eighty-nine seem more likely to have been introduced by human
