. The vegetation of the Siberian-Mongolian frontiers (the Sayansk region). Botany; Botany. imberbe, linbus Chamaemorus, Rubus arclicus, Cardamine macrophyllu, Ledum paliistre, Drosera rotundifolia, Menyanthes trifoliata, Eriophoriim vaginaliim, Andromeda polifolia, Ranunculus radicans, and Utricularia minor. In stony places and on dry, sloping cliffs I have collected as the most charac- teristic plants: Agrimonia pilosa, Geranium Robertianum, Asplenium septenlrionale, Woodsia ihensis, and Asplenium Rutd Fig. 35. Characteristic view south of the Algiac Pass near Ust Algiac. Picea obov
. The vegetation of the Siberian-Mongolian frontiers (the Sayansk region). Botany; Botany. imberbe, linbus Chamaemorus, Rubus arclicus, Cardamine macrophyllu, Ledum paliistre, Drosera rotundifolia, Menyanthes trifoliata, Eriophoriim vaginaliim, Andromeda polifolia, Ranunculus radicans, and Utricularia minor. In stony places and on dry, sloping cliffs I have collected as the most charac- teristic plants: Agrimonia pilosa, Geranium Robertianum, Asplenium septenlrionale, Woodsia ihensis, and Asplenium Rutd Fig. 35. Characteristic view south of the Algiac Pass near Ust Algiac. Picea obovata and Betula pubescens, with a dense ground vegetation consisting of various herbs (see text). The vegetation „,,,,..„ .,,.,. 11 r- • about the tree lowards the limit 01 tree vegetation the birch is generally iirst seen to remain ii„iit, behind, soon followed by the aspen. About 100 m. below the tree limit proper, the spruce and the silver-fir also come to an end, only the cedar, the larch, and rarely, the fir reaching it. The climatic conditions, especially the moisture, seem to be the chief factors in determining which of these trees are to reach highest. In drier localities, as for instance on the Tannu-Ola, the larch seemed to be the most persevering one, the fir and above all the cedar, on the contrary, predominating in moister places, for in- stance in the «AItaian». The height of the tree limit seemed, for the rest, to vary even in rather neighbouring localities. It is also worth noticing that the tree limit descends east- wards from the Yenisei from a height of about 2200 m. above sea-level to about 1700 to 1800 m. above sea-level near the Algiac Pass, a characteristic trait that has not yet been accounted for. Moreover, the tree limit, of course, reaches higher on the south side of the mountains than on the north when upon level terms in other respects. In the moister parts of the Sayansk district the cedar is, as we have seen, the tree that climbs highest
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1921
