In the genial smiling country which extends from Monte Video to the mouth of the Rio Negro, the vegetation is almost wholly confined to Gramineæ. It is in this region that the feathery Pampas Grass (_Gynerium argenteum_) flourishes luxuriantly, covering leagues upon leagues with its silvery panicles and drooping leaves, which, when stirred by a gentle wind, ripple like the slow-moving, spray-gleaming waters of a sunny sea. It has become of late years a favourite ornament of our British gardens, and may justly be taken as a type of tender loveliness.[116] Beyond the Rio Negro the country puts on a wilder aspect, and it is with difficulty the most adventurous botanist can penetrate into its recesses. Nearly all the southern districts of Patagonia form, as we have already seen, an immense and almost level plain, whose soil is generally dry, arid, and impeded with large pebbles; the northern districts, on the other hand, offer a less monotonous landscape, are broken up with rocks and ravines, interspersed among tolerably fertile pastures, whose flora has not yet been fully investigated. CHAPTER VI. THE FLORA OF THE AUSTRALIAN PLAINS. The Deserts of the Australian interior have been laboriously traversed, not, as we have seen, without much suffering, and even sacrifice, by a handful of intrepid travellers, who have proposed to themselves simply the solution of certain geographical problems. It will therefore be understood that we owe to them only a few incidental notices of their botanical features. For an accurate examination of these the pioneers of commerce have neither the means, the opportunities, nor the requisite scientific knowledge. As far as its flora is concerned, the Australian interior is wholly "virgin soil," a new botanical world, perhaps, awaiting the advent of a Columbus. Only the littoral districts have been satisfactorily explored; and here, in the south, we meet with the names of Labillardière, Robert Brown, Gaudichaud, D'Urville, Sieber, Lesson, Cunningham, and other eminent botanists. To these celebrated names we must also add those of Dr. Mueller, Director of the Botanical Gardens at Melbourne, Sir William Hooker, and Mr. Bentham. Their united labours have provided the public with a vast amount of curious and authentic information, and have established the fact that the botany of New Holland, like its zoology, has a physiognomy peculiarly its own, and that many, nay, most of its vegetable species, are not less characteristic than its strange and astonishing animal types. One is almost tempted to adopt in sober earnest what Sydney Smith said in humorous exaggeration, that, "in this remote part of the earth, Nature (having made horses, oxen, ducks, geese, oaks, elms, and all regular and useful productions for the rest of the world) seems determined to have a bit of play, and to amuse herself as she pleases."[117] Undoubtedly she has indulged in the most wayward and eccentric forms. If there exist any