Abstract
The Seychelles are the only high oceanic islands of granitic origin and their native vegetation is thus of considerable botanical interest. In the nineteenth and early twentieth centuries widespread clearance for coconut and cinnamon plantations resulted in native forest being confined mainly to montane areas. Cinnamon has proved to be very invasive in natural forest and a number of other introduced plant species have also been recognized as problematic for some time. Recent studies have revealed that two more introduced plant species - Memecylon floribunda and Clidemia hirta - are significant new threats to native vegetation on Mahe and Silhouette, respectively.

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