Consider what the variety of geologic formation implies: an almost infinite variety of plants; moreover, owing to the difference of altitudes, the flora reaches in a chromatic scale from the fringe of the Alpine snows to the burning sands by the seas. In one little commune, it is estimated that there are more varieties to be found than in the whole of Ireland.
But the visitor to the seaboard—the French Côte d'azur and the Italian Riviera—returns home after a winter sojourn there with his mind stored with pictures of palms, lemons, oranges, agaves, aloes, umbrella pines, eucalyptus, mimosa, carob-trees, and olives. This is the vegetation that characterises the Riviera, that distinguishes it from vegetation elsewhere; but, although these trees and shrubs abound, and do form a dominant feature in the scenery, yet every one of them is a foreign importation, and the indigenous plants must be sought in mountain districts, away from towns, and high-roads, and railways.
These strangers from Africa, Asia, Australia and South America have occupied the best land and the warmest corners, just as of old the Greek and Roman colonists shouldered out the native tribes, and forced them to withdraw amidst the mountains.
The traveller approaching the Riviera by the line from Lyons, after passing Valence, enters a valley that narrows, through which rolls the turbid flood of the Rhone. Presently the sides become steeper, higher, more rocky, and draw closer; on the right appears Viviers, dominated by its cathedral and tower, square below, octagonal above, and here the Rhone becomes more rapid as it enters the Robinet de Donzère, between calcareous rocks full of caves and rifts. Then, all at
