xvi A FLORA OF GIBRALTAR AND THE NEIGHBOURHOOD 
similar lists :— 
Hemaiss cirrhosa v. Dautezi (endemic), Hesperis laciniata ? 
Bras sabularia vy. papillaris (endemic), Iberis gibraltarica, 
Litcathemum origanifolium, "Deaathan Caryophyllus, Silene 
prealiariee: ‘pergularia rupestris, Linum maritimum, Lavatera 
arborea, Medicago obscura, Melilotus aed nog See suffocatum, 
Sedum micranthum? Saxifraga globulifera vy. gibraltarica, Ferula 
tingitana? Vadllantia muralis, Helichry at pit igs . Boissieri 
(endemic), Senecio Sse. gibraltaricus, Calendula suffruticosa, 
Barkhausia fetida, Campanula mollis v. microphylla, Antirrhinum 
tortuosum, Lafuentea rotundifolia ? Lavandula dentata? Thymus 
diffusus (endemic), Salvia triloba v. Eiponna (endemic), Phlomis 
fruticosa, Sideritis arborescens, Achyranthes argentea, Parietaria 
lusita tanica, Crocus Salzmanni? Notochlena vell 
side 
species which are absent from or rare on the , but common 
in Spain :—Cistacee (almost all species, though Helianthemum 
srroar lott is found in Gibraltar alone), Spergula arvensis, 
Erodiu Es PSE; Ulex (all species), Tiefoleum Cherlert, 
Wits coronarium, Cinanthe pimpinelloides, Ormenis mixta, 
Carlina racemosa, poe. dula Stechas, Romulea Ga 
District II. Nevrran Grounp.—This is a very small area, 
about two-thirds of a square mile, lying between the British and 
i es, and reaching fr ea t a. 1 treat it as a 
separate district on account of the peculiarity of its situation. It 
is isolated from the mainland of Spain by the so-called Sand 
Desert, or extensive sand dunes lying to the north of Linea, and, 
not being British territory, it cannot be included in District I. 
From physical spect tions, it might have been desirable to 
have treated the Neutral Ground and North. Pront together as a 
separate district, or as part of District III., but it seems best to 
make the British Lines the limit of Gibraltar. The chief difficulty 
that arises is from the doubt whether many of the old records 
refer to the North Front or the Neutral Ground; but this is of 
less importance in view of the fact already pointed out, that 
formerly there was no North Front, so that the flora of the 
Neutral Ground must have reached the foot : ee Rock. Its 
surface, though approximately level, is sufficiently undulating to 
allow pools of water to stand throughout the rainy season, thus 
providing suitable soil for que a number of marsh-loving species 
to grow, chiefly on the west side, which is for the most part 
grassy. Towards the east the soil becomes more and more sandy, 
till on the shore only a few species are found, such as Maitthiola 
tricuspidata, Silene nice@ensis, Ononis variegata, Medicago marina, 
