The leares of 85 commercially important Southeastern Australian forest species hare been examined for rutin and the methods of extracting and manufacturing rutin from Eucalypts critically assessed. Rutin was found in fire species (Eucalyptus alpina, E. baxter/, E. blaxlandi, E. caliginosa, E. cannoni) in which it had not preriously been reported. Its presence was confirmed in E. delegatensis, E. macrorrhyncha, E. youmani, Grevillea robusta. The rela. tionship of leaf-age, altitude, locality and season to rutin content ~ithin species was inrestigated, particularly in the case of E. macrorrhyncha. Rutin, 3,5,7,3 p, 4t-pentahydroxyflavone-3 rhamnoglucoside has been commercially produced from Eucalyptus macrorrhyncha 1 leaves by two small industrial milts in New South Wales, Australia, for more than a decade. It has almost all been exported to the United States, where it is used for pharmaceutical purposes. The production per annum has been 30-40,000 lb. for the past nine years. Prior to this, and concurrently with it for a time, dried E. macrorrhyncha leaves were exported. This practice gradually ceased when it was found that local plants could supply market requirements.