The larch becomes predominant chiefly in two new species (Larix sibirica and L.
The silver fir (Abies sibirica, Pinus pectinata) and the stone-pine (P. Cembra) are quite common; they reach the higher summits, where the last-named is represented by a recumbent species (Cembra pumila).
The alpine rose (Rhododendron dauricum) clusters in masses on the higher mountains; juniper, spiraea, sorbus, the pseudo-acacia (Caragana sibirica and C. arborescens, C. jubata in some of the higher tracts), various Rosaceae - Potentilla fruticosa and Cotoneaster uniflora - the wild cherry (Prunus Padus), and many other shrubs occupy the spaces between the trees.
The ibex are connected with the wild goat by means of Capra nubiana, in which the front edge of the horns is thinner than in either the European C. ibex or the Asiatic C. sibirica; while the Spanish C. pyrenaica shows how the ibex-type of horn may pass into the spirally twisted one distinctive of the markhor, C. falconeri.
In the north-eastern parts of Russia, in the country towards the Petchora river, and on the Ural, a peculiar variety prevails, regarded by some as a distinct species sibirica); this form is abundant nearly throughout Siberia, extending to the Pacific coast of Kamchatka and the hills of the Amur region.
Charming dwarf hardy bulbous plants of the liliaceous order, blooming in the early spring in company with Scilla sibirica, and of equally easy cultivation.
P. officinalis, i ft., has prettily mottled leaves and blue flowers; P. sibirica is similar in character, but has broader leaves more distinctly mottled with white.
Sibirica, 4 in., both intense blue, are among the most charming of early spring flowers; S.
Tree vegetation, which reaches up as high as 6500 and 8150 ft., the latter limit on the north and west, consists of magnificent forests of birch, poplar, aspen, and Coniferae, such as Pinus cembra, Abies sibirica, Larix sibirica, Picea obovata, and so on, though the fir is not found above 2500 ft., while the meadows are abundantly clothed with brightlycoloured, typical assortments of herbaceous plants.
In northern Europe this belt is characterized by such species as Picea excelsa (spruce), which extends south to the mountains of the Mediterranean region; Pinus sylvestris (Scottish fir), reaching from the far north to western Spain, Persia and Asia Minor; Juniperus communis, &c. In north Siberia Pinus Cembra (Cembra or Arolla Pine) has a wide range; also Abies sibirica (Siberian silver fir), Larix sibirica and Juniperus Sabina (savin).