I spent a considerable time on the top of the pass, and by close searching, in the crevices of the stones, especially on the hill which rose to the south-east, I succeeded in collecting a considerable number of species of plants, though very much fewer than on the Werang pass two days before. From our morning's camp to the top of the pass the whole number of species which I met with was only forty-six, not half of which were observed on the summit. The number gathered on the former pass was nearly three times as great. It must not be forgotten, however, in comparing the two ranges, that the Werang pass is 1300 feet lower than that of Runang, and ought therefore, independent of climate, to be more productive. The species which were observed for the first time on the summit of the Runang pass were not more than six, and were all forms which I have since found to be abundant throughout the higher parts of Tibet. A little willow, creeping among the stones, and scarcely more luxuriant than Salix herbacea, was the only shrubby plant. The others were Oxytropis chiliophylla, Biebersteinia odora, a Draba, Lamium rhomboideum of Bentham, and a species of rhubarb, of which I found only a few leaves and one or two panicles, from which the ripe fruit had nearly fallen away.
The descent from the pass to Sungnam was even more barren and desolate than the other side. The valley was open and almost straight, and the slope gradual. Till nearly half-way not a drop of water occurred on the road, and for miles almost the only vegetation on the hill-sides was an erect branched Polygonum, never more than a foot in height. At an elevation of about 10,000 feet, a few deodars occurred, all miserably stunted in height, though often with trunks of considerable diameter. Gerard's pine, and the ash of Tibet, also appeared a little lower, but in very small numbers. During the greater part of the descent, the white houses of Sungnam were in sight, to all appearance at the end of the valley down which we were proceeding; but when near the bottom, we discovered that we were still separated from them by a wide and level plain, that of the Ruskalan river. On the opposite side of this plain, on the side of a hill just sufficiently high to terminate the vista down the valley by which we descended from the pass, stands the town of Sungnam; while the cultivated lands, which form a wide belt, scarcely higher than the level of the river, were entirely out of sight till we arrived close to the precipitous bank parallel to the river. Here the descent was abrupt to the bed of the Ruskalan. The bank was alluvial, with enormous boulders, and was covered with tufts of Ephedra, a remarkable leafless plant with rod-like branches, which is abundant in every part of northern Tibet, especially in the driest and hottest exposures. It extends also occasionally into the partially rainy district, being found in Kunawar nearly as far west as the bridge of Wangtu.
SUNGNAM.
August, 1847.
Sungnam is one of the principal places of Kunawar, dividing with Kanam, which we did not visit, the claim to be the principal seat in the Sutlej valley of the Buddhist religion. It contains numerous temples and monasteries, with also a considerable industrial population. Cultivation occupies a great part of the valley, and extends up the course of the stream to a considerable distance. The level tract along the river has in many places a breadth of nearly a quarter of a mile, and the town occupies a ridge on the mountain side, to which a gently-sloping road leads from the bridge by which we crossed the Ruskalan.
The elevation of Sungnam above the level of the sea is 9000 feet. Still the vine thrives well, the steep slopes facing the river being covered with vineyards: the grapes were not yet ripe. The principal fruit-trees are apricots and apples. Willows and poplars are also frequent in the village; a new species of the latter being for the first time observed, with leaves white and downy underneath, which appears in no way to differ from Populus alba, the common white poplar of Europe.
CHAPTER IV.
Hangarang ridge separates Kunawar from Piti—Ascent to Hangarang Pass—Alluvial deposit—Steep ascent—View of valley—Limestone rocks—Caragana versicolor, or Dama—Camp at 14,000 feet—Top of pass—View from pass—Vegetation of summit—Descent to Hango—Cultivation round the village—Luxuriant wild plants—Road to Lio—Crambe—Ravine of Piti river—Lio—Bridge over Piti river—Ascent to Nako—Nako—Cultivation of the village—Buddhist temple—Transported blocks—Chango—Changar—Stopped by villagers on Chinese frontier—Natural bridge—Kyuri—Alluvium—Clay deposit with shells—Lari—Ramifications of mountain ranges—Alluvial platforms—Pok—Dankar—Lara—Rangrig—Upper part of Piti—Climate—Saline exudations
The Hangarang ridge, as we may conveniently call that mountain range on which the pass of Hangarang is situated, forms the boundary between the districts of Kunawar and Hangarang. As this range terminates at or close to the point where the Sutlej is joined by the Piti river, this division is geographically convenient. It has also a marked physical signification, forming the absolute limit of the deodar and Gerard's pine; and indeed, if we except the juniper, of all tree vegetation.
On the 22nd of August, our party left Sungnam to ascend towards the Hangarang pass, encamping, as on the two previous occasions, on the upper part of the ascent, so as to get to the summit of the pass at an early hour next day. Our road lay up a narrow ravine, through which a small stream descended from the vicinity of the Hangarang pass, to join the Ruskalan immediately below Sungnam. We followed for a long time the course of this rivulet, so that the ascent was by no means fatiguing. A very few stunted deodars, and a single tree of Pinus Gerardiana, were the only trees met with. A little shrubby vegetation was now and then seen, consisting of an ash, rose, Colutea, Lonicera, and Spiræa. The banks of the ravine were everywhere composed of a conglomerate of angular stones, in general imbedded in soft clay, though the matrix was not unfrequently calcareous, and in several places even composed of crystalline carbonate of lime.
BEDS OF CONGLOMERATE.
August, 1847.