SUMMARY. 



359 



Centaurea Calcitrapa. 

 Verbascum Blattaria. 

 Filago minima. 

 Alopecunis pratensis. 

 Rumex acetosella. 

 Nardus stricta. 

 Hypericum humifusum. 

 Senecio aquaticus. 

 Lotus major. 

 Juncus squarrosus. 

 Galium saxatile. 

 Betula alba. 

 Quercus sessiliflora. 

 Calluna vulgaris. 



Hieracium boreale. 

 Jasione montana. 

 Stellaria Holostea. 

 Trifolium fragiferum. 

 Luzula multiflora. 

 Aira csespitosa. 

 Triodia decumbens. 

 Montia fontana. 

 Pulicaria vulgaris. 

 Senecio sylvaticus. 

 Lepigonum rubrum. 

 Vaccinium Myrtillus. 

 Digitalis purpurea. 



M. Thurmann more Mly elucidates his views by giving other lists, con- 

 taining 149 xerophilous species. Of these 67 ( =44-96 per cent.) are British 

 plants. 



In Middlesex only 29 species ( = 19-46 per cent.) are found : — 



Aquilegia vulgaris. 

 Inula Conyza. 

 Orchis purpurea. 

 0. ustulata. 

 Gymnadenia conopsea. 

 Ophrys apifera. 

 0. muscifera. 

 Cerastium arvense. 

 Hypericum hirsutum. 

 Rosa spinosissima. 

 Carlina vulgaris. 



Vinca minor. 

 Verbascum Thapsus. 

 Spiranthes autumnalis. 

 Crocus vernus. 

 Carduus acaulis. 

 Herminium monorchis. 

 Ruscus aculeatus. 

 Festuca duriuscula. 

 Melica uniflora. 

 Ceterach officinarum. 

 Scolopendrium vulgare. 



And the eight species in the list* on the preceding page. 



The ' hygrophiles ' are also shown in more detail by three lists in the 

 ' Essai,' The first is of ' hygrophiles ' in general, and contains 134 names ; 

 the other two are contrasting — the one contains typical sand-loving ' hygro- 

 philes' (82), and the other s,^ec\ai\\y clay -loving 'hygrophiles' (39), and these 

 correspond to a great extent to the two classes of eugeogenous soils called 

 'psammiques' and 'peliques' respectively. In all, the three lists contain 

 255 names. The British Isles contain of the first list 91, of the second 59, 

 and of the third 27 species— in all 177 ( = 69 per cent.). 



Middlesex possesses of the plants in the first list 59, in the second 44, 

 and the third 24— in all 127 ( = 49-80 per cent.). 



It is not necessary to mention those in the first, a list of ordinary ' hy- 

 grophiles ' having been already given. 



* Except Orchis militaris, whicli is omitted by Thurmann in this list. 



