Corsica is the most central region of the great plant-system of the Mediterranean--a system characterized by a profusion of fragrant Labiatæ and graceful Caryophylleæ. These plants cover all parts of the island, and at all seasons of the year fill the air with their perfume. On account of the central position of Corsica, its vegetation connects itself with that of all the other provinces of the immense botanic region referred to; through Cape Corso it is connected with the plants of Liguria, through the east coast with those of Tuscany and Rome, through the west and south coasts with the botany of Provence, Spain, Barbary, Sicily, and the East; and finally, through the mountainous and lofty region of the interior, with that of the Alps and Pyrenees. What a wondrous opulence, and astonishing variety, therefore, in the Corsican vegetation!--a variety and opulence that infinitely heightens the beauty of the various regions of this island, already rendered so picturesque by their geological configuration. Some of the forests, on the slopes of the mountains, are as beautiful as the finest in Europe--particularly those of Aitone and Vizzavona; besides, many provinces of Corsica are covered with boundless groves of chestnuts, the trees in which are as large and fruitful as the finest on the Apennines or Etna. Plantations of olives, from their extent entitled to be called forests, clothe the eminences, and line the valleys that run towards the sea, or lie open to its influences. Even on the rude sides of the higher mountains, the grape-vine twines itself round the orchard-fences, and spreads to the view its green leaves and purple fruit. Fertile plains, golden with rich harvests, stretch along the coasts of the island, and wheat and rye enliven the hillsides, here and there, with their fresh green, which contrasts agreeably with the dark verdure of the copsewoods, and the cold tones of the naked rock. The maple and walnut, like the chestnut, thrive in the valleys and on the heights of Corsica; the cypress and the sea-pine prefer the less elevated regions; the forests are full of cork oaks and evergreen oaks; the arbutus and the myrtle grow to the size of trees. Pomaceous trees, but particularly the wild olive, cover wide tracts on the heights. The evergreen thorn, and the broom of Spain and Corsica, mingle with heaths in manifold variety, and all equally beautiful; among these may be distinguished the _erica arborea_, which frequently reaches an uncommon height. On the tracts which are watered by the overflowing of streams and brooks, grow the broom of Etna, with its beautiful golden-yellow blossoms, the cisti, the lentisks, the terebinths, everywhere where the hand of man has not touched the soil. Further down, towards the plains, there is no hollow or valley which is not hung with the rhododendron, whose twigs, towards the sea-coast, entwine with those of the tamarisk.