118 Botanical Notices from Spain. 
both coming from the Sierra de Gazales, which empty themselves in 
the furthermost northern part of the bay. This hilly land is, as al- 
ready observed, exclusively covered with Calycotome villosa, Lk., and 
a Genista; frequently are seen also large patches of Chamerops hu- 
milis, and, more seldom, a Sarothamaus. On somewhat moist places 
and under bushes grows everywhere Allium triquetrum, L., and also 
Bellis sylvestris, Cyr., B. annua, L., Ranunculus flabellatus, Desf., Ru- 
mex bucephalophorus, L., a small blue-flowered Linum, especially in 
the scattered copses of Pinus picea, also Hedysarum coronarium, L., 
Ophrys apifera, Huds., more rarely and only on limestone, Ophrys 
lutea, Cav., several Carices and grasses, SalviaVerbenaca, L., Anthyllis 
tetraphylla, L., Calendula arvensis, Alyssum maritimum, Cerastium glo- 
meratum, Cerinthe major, Corrigiola littoralis, &c. Large patches were 
covered with Pteris aquilina, especially along the foot of the moun- 
tain; whilst in the moist lowlands and marshes grew Juncus acutus, 
Heleocharis palustris and Carices in abundance, rarely Alisma ranun- 
culoides, L. From Algeciras, where I arrived on the evening of March 
22nd, I made various excursions into this hilly district. as well as to 
the neighbouring sierra. In one of these, in which I ascended one of 
the highest summits of the chain, the Cerro Comodre, I for the first 
time met with the splendid Drosophyllum lusitanicum, Lk., unfortu- 
nately not yet in blossom, but in great profusion. It covers the 
whole northern acclivity of the above-named mountain, which con- 
sists of arid boulders of sandstone, where it occurs, in company with 
a beautiful shrubby Helianthemum, at a height of 2000 feet and up- 
wards. Cistus populifolius, L., covers exclusively the east and south- 
ern acclivity, which was also not yet in blossom, among which here 
and there grows a pretty species of Pedicularis, similar to P. palus- — 
tris. 
After a sojourn of eight days at Algeciras, I started, on the 29th 
of March, for Gibraltar, whose interesting rocks I have explored at 
all points where it was practicable; for on the eastern acclivi 
this mountain is only accessible at few points. The Rock of Gibral- 
tar consists of limestone, whose strata are inclined from east to west 
at an angle of 45° to 50°. On that account it forms, on the western 
acclivity, a steep rocky slope, on the lowest part of which lies the 
town, whilst the eastern acclivity descends in steep, almost perpen- 
dicular walls of rock. This rock, so arid and barren—for it has 
nowhere any water, and is also almost destitute of any soil—never- 
theless presents a luxuriant vegetation at every season of the year, 
because the atmosphere is constantly kept moist by the evaporation 
of the surrounding ocean. The English, taking advantage of this 
circumstance, have converted a large portion of the rock into a kind 
of paradise, having brought from the main-land earth, with which 
they have covered the rock, and have planted various trees, shrubs 
and plants of the temperate and warm zones, which flourish here 
without any watering in the most luxuriant manner. The gardens 
and parks extend from the town, which lies at the north-western foot 
of the rock, as far as the Punta de Europa, or the most southern point 
of it, where the lighthouse is placed in the midst of formidable for- 
