But the littoral of Western Africa is gifted with a flora as luxuriant as it is varied. According to Dr. Welwitsch, who has explored this region, previously almost a _terra incognita_ to Europeans, "the special feature in the neighbourhood of Benguela is the abundance of parasitical _Lorunthaceæ_, or mistletoe, on the thickets of the thorny Mimosa, to which are attached those Roccellæ (or Archils), the _Roccella tinctoria_ and _R. fuciformis_, that yield so brilliant a lilac dye. In the gardens of Benguela the vegetables of Europe are most successfully cultivated, as well as a great number of fruit trees belonging both to tropical and temperate climes: citron and orange, the olive, the cashew-nut, the anana, the fig, the vine, the pomegranate, the elais-palm, the banana, the anona, and the corrossol. The vine bears grapes twice every year, and the crop on each occasion is abundant and of fine flavour. The gardens in the vicinity of Mossamèdes, between the fifteenth and sixteenth parallels of south latitude, exhibit a curious medley of vegetables on every side, where you may see flourishing side by side the banana and the potato, manioc and wheat, sugar-cane and flax, barley, and every kind of Spanish potato." A few miles from Cape Negro the coast rises for from 300 to 350 feet above the sea-level, forming a continuous plateau, where the flora, though meagre when compared with that a little further to the north, offers nevertheless to the traveller some objects of the highest interest. It was here that Dr. Welwitsch met with the strange plant which, in commemoration of its intrepid discoverer, Sir William Hooker named _Welwitschia_,[108] but which the natives call _Tumboa_. "In its youth its two original cotyledonary leaves appear to grow considerably, and extend horizontally in opposite directions, raised but little above the surface of the sand, whilst the intervening stock thickens and hardens, assuming an obconical shape, flat at the top, and rapidly tapering below into the descending root. As years go on, the original pair of leaves, having attained their full size, and a hard, tough, fibrous consistence, do not die away, but gradually split up into shreds; the woody mass which bears them rises very little higher, but increases horizontally both above and below the insertion of the leaves, so as to clasp their base in a deep marginal slit or cavity; and from the upper side, at the base of the leaf, several short flowering stalks are annually developed. These are erect, dichotomously branched jointed stems, rising from six inches to a foot in height, and bearing a pair of small opposite scales at each fork or joint, each branch being terminated by an oblong cone, under the scales of which are the flowers and seeds. The result is, that the country is studded with these misshapen table-like or anvil-like masses of wood, whose flat tops, pitted with the scars of old flowering stems, never rise above a foot