But some were essentially indigenous, and he observed a singular character given to the fauna by the presence of certain Eastern forms, unknown in other parts of Persia, such as the tiger, a remarkable deer of the IndoMalayan group, allied to Cervus axis, and a pit viper (Halys).
In general terms they extend, with modifications of character probably due to admixture with other types and to varying conditions of life, over the whole of northern Asia as far south as the plains bordering the Caspian Sea, including Tibet and China, and also over the IndoMalayan peninsula and Archipelago, excepting Papua and some of the more eastern islands.
As in the IndoMalayan sub-region, epiphytic orchids are probably most numerous in point of species, but the genera and even sub-tribes are far more restricted in their range than in the Old World; 4 sub-tribes with 74 genera of Vandeae are confined to South America, though varying in range of climate and altitude.
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