248 FLORA INDICA. 



Le-clad towards the summit. The valley of Hukum (or 

 )okhoom), which was visited by Griffith, is more open, but 

 surrounded on the north and east bv mountains elevated 



feet, and is traversed by numerous ranges 



hilis 



We do not know the boundaries between the different pro- 

 vinces on the Irawadi, nor is it necessary for our purpose to 

 distinguish them, as the upper country is unknown to us. 



Dr. Wallich, who accompanied Mr. Crawfurd's mission to 

 Ava soon after the close of the Burmese war in 1826, was the 

 first botanist who explored the vegetation of the Irawadi. 

 He ascended that river as far as the capital, and visited the 

 mountain range bounding the Taong-dong river to the east- 

 ward, from which some of his finest plants were obtained. Mr. 

 Griffith, in 1837, entered Ava from Assam, and descended 

 the Irawadi to its mouth, but the collections made by him 

 on this journey have not been distributed. Since the earlier 

 heets of this Introduction were printed, Dr. McClelland has 

 forwarded to the Hookerian Herbarium an excellent and very 

 valuable collection from Pegu. 



8. Tenasserim. 



The province of Tenasserim is separated from Pegu by the 

 Sitang river, and extends south to the commencement of the 

 Malayan Peninsula, including the districts of Martaban, Ta- 

 voy, and Tenasserim. At its northern extremity, the great 

 river of Martaban forms an extensive alluvial plain like that 

 of Pegu, bounded to the east by mountains of considerable 

 but unknown elevation. Elsewhere the mountains approach 

 the coast, and are said to attain occasionally, but not con- 

 tinuously, an elevation of 4000 or 5000 feet. The coast is 

 generally alluvial ; tidal channels, which separate a broad and 

 continuous belt of islands from the main, run into the in- 

 terior, and the hilly tracts are covered with dense forest. 



In climate Tenasserim is intermediate between Arracan 

 and the Malayan Peninsula. The summer rains are every- 



