570 MR. W. G. CLARKE ON BRECKLAND CHARACTERISTICS. 
centaurium and Erodium cicutarium of which there is a white- 
flowered form, while Veronica officinalis is not infrequently 
pink-flowered. Other heathland plants which have been 
recorded are Botrychium lunaria, Apera interrupta, Phleum 
Bcehmeri, Air a prcecox, Car ex ericetorum, Orchis ustulata, 
Thesium humifusum, Nepeta glechoma, Calamintha acinos, 
Veronica arvensis, V. verna, V. triphyllos, Euphrasia nemorosa, 
Myosotis collina, M. versicolor, Gentiana campestris, Hypocliceris 
glabra, Potentilla verna, Herniaria glabra, Scleranthus 
annuus var. biennis, Medicago minima, Hippocrepis comosa, 
Helianthemum chamcecistus, Fumaria densiflora, F. parvifiora, 
F. Vaillantii, Papaver hybridum, Dianthus deltoides, Sagina 
ciliata, Thalictrum minus, and Anemone pidsatilla. 
Between the spring of 1906 and the end of 1907, Mr. H. 
Dixon Hewitt, F.I.C., of Thetford, found in the higher parts 
of the district Thalictrum minus var. flexuosum, Papaver 
argemone, Arabis hirsuta, Alyssum calycinum, Sisymbrium 
Sophia, Teesdalia nudicaulis, Silene otites, S. conica, Sagina 
nodosa, Arenaria tenuifolia, Mcenchia erecta, Cerastium 
arvense, Hypericum humifusum. Ononis spinosa, Medicago 
falcata, M. sylvestris, Trifolium glomeratum, Astragalus 
Danicus, Vicia lathyroides, Spircea filipendida, Potentilla 
argentea, Tillcea muscosa, Saxifraga granulata, Chcerophyllum 
anthriscus, Caucalis nodosa, Asperula cynancliica, Erigeron 
acris, Filago spathulata, F. minima, Anthemis arvensis, 
Artemisia campestris, Campanula hybrida, Salvia verbenaca, 
Lamium amplexicaule, Scleranthus perennis, Chenopodium 
rubrum, and Ch. Bonus Henricus. 
The most remarkable feature of the flora is the survival from 
remote ages of marine, or rather sand-dune plants in a habitat 
which has long been abnormal. Agricultural operations by 
many generations have doubtless resulted in restricting the 
area originally occupied by these plants of the littoral, and 
many species have probably been eliminated in this locality 
in the struggle for existence. This peculiar feature in the 
life of the “ brecks ” was, I believe, first pointed out* in 1870 
by the late Mr. C. G. Barrett, who drew attention to the fact 
* Trans. Norfolk and Norwich Nat. Soc. vol. i. p. 138. 
