152 



JOURNAL, R.A.S. (CEYLON). 



[Vol. IX. 



We may take 2 or 3 Natural Orders for analysis. Of 

 D'dleniacecB we possess 6 genera and 15 species ; 1 genus 

 Sc/iumackeria, with 3 species, is endemic, but allied to 

 Malayan ones ; another, Acrotrema, has 7 species all en- 

 demic, and one very variable (of which many more species 

 could be manufactured). Of this genus, which may be said 

 to have its centre in Oeylon, there is one other species in 

 the Malay Peninsula, and another occurs in Malabar (thus 

 just excluding the genus from the above lists of non-Indian 

 genera). The third genus, Wormia, is entirely Malayan, 

 with the exception of our single endemic species (and one 

 in Madagascar). The fourth, JDillenia, is mainly also 

 Malayan ; of our 2 species, one is endemic, the other also 

 occurs in the Indian Peninsula as well as widely through 

 Malaya. We have but a single species each of the remaining 

 two genera, Delima and Tetracera, both of which are iden- 

 tical with Malayan ones, one also reaching Malabar. Of 

 another family, Anonacece, Ceylon contains 13 genera and 

 39 species, and is too extensive to go through seriatim. 

 But two of the genera, Xylopia with 3 endemic species, and 

 Anaxagorea with one discontinuous, are Malayan and not 

 Indian ; whilst of Uvaria, with 6 species, 2 are identical 

 with Malayan ones and 2 are endemic ; and Goniotkalamus 

 has 7 species (6 of them endemic) against only 3 in Penin- 

 sular India and 7 in Malaya. But the most remarkable 

 example of this western extension of the Malay flora to 

 Ceylon is seen in the Nat. Order Dipterocarpacece, which is 

 pre-eminently characteristic of the Archipelago. This 

 family is a large one, and destined to be largely added to as 

 investigation of the less-known Malay islands is further 

 carried out ; its members are all forest trees, and each 

 species appears to be somewhat restricted in its range. 

 Thus the 24 species recorded from Sumatra (under 4 genera) 

 are all different from the far more numerous ones from Java. 

 In the south-west of Ceylon we have no less than 8 genera 

 of this Order, containing 46 species (i.e., 1*7 per cent, of the 

 Phanerogamic flora and equal to the Myrtacece). Of the 

 genera, 2 — Monoporandra with 2 species, and Doona with no 

 less than 11 species — are strictly endemic, and so is the 

 well-marked sub-genus of Vateria, Stemonoporus, with 13 

 species. Of the remaining genera, Dipterocarpus, with 5 



