. Contributions from the Botanical Laboratory and the Morris Arboretum of the University of Pennsylvania, vol. 13. Botany; Botany. 6o THE GEOGRAPHICAL REVIEW Specific term caiicasica in botanical nomenclature. Plants, like people, seem to have stopped here in their migratory journeys (nine- teen different languages are spoken). The distinctive plant life is due primarily to the high barrier formed by the mountains between regions of wholly different climate. I* â I. â ' I) 80 MILES 80 KILOMETERS. â¢AO Erzerum 6E06W REVPEW, JAW. I9M Fig. 2âLocation map of the Caucasus. Scale approximately i : 8
. Contributions from the Botanical Laboratory and the Morris Arboretum of the University of Pennsylvania, vol. 13. Botany; Botany. 6o THE GEOGRAPHICAL REVIEW Specific term caiicasica in botanical nomenclature. Plants, like people, seem to have stopped here in their migratory journeys (nine- teen different languages are spoken). The distinctive plant life is due primarily to the high barrier formed by the mountains between regions of wholly different climate. I* â I. â ' I) 80 MILES 80 KILOMETERS. â¢AO Erzerum 6E06W REVPEW, JAW. I9M Fig. 2âLocation map of the Caucasus. Scale approximately i : Vegetation Zones of the Main Range The Georgian Military \\ ay (Fig. 2) from Ordzhonikidze (Vladi- kavkaz) to Tiflis passes through the renowned Daryal Gorge. A journey along this route provides an opportunity for studying the typical vegetation zones of the main range. North of Ordzhonikidze spread the great steppes, which, where not in cultivation, support that most characteristic of all steppe plants, artemisia. The best- known of the Russian artemisias is A. absinthium {A. tridentata is the sagebrush of southwestern North America). Where the steppes rise to meet the slopes of the lower foothills and forestation has left open areas, a number of small plants find a home and convert the steppe-forest transitional subzone into a flonstically attractive region. Here, at 2400 feet, the dioecious shrub Ilippophae rhamnoides grows in extraordinary abundance, and her- baceous plants with showy flowers make their first appearance, though they are more abundant in the slightly higher and cooler ravines of the foothills. The lowland forest, a herbaceous woodland in the main, is entered at an altitude of 2500 feet, near the former village of Balta. The black poplar {Populus ni^ra), monarch among the trees, though not abun- dant, has a wide distribution in the Caucasus. Its close relative P pyramtdalis is more numerous and gives to the landscape something vegetation zones i
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