N6. 31 —1885.] CEYLON FLORA. 



159 



III. — Preponderant Genera. 



Genera containing over 20 species are: — 



1. 



Cyperus 



46 



7. 



Ficus 



.. 24 



2. 



Eugenia 



40 



8. 



Memecylon 



23 



3. 



Panicum 



38 





' Crotalaria 



.. 21 



4. 



Fimbristylis 



34 



9. . 



Desmodium 



.. 21 



5. 



Phyllanthus 



30 





. Hedyotis 



21 



6. 



Strobilanthes ... 



27 









The average number of species to a genus in Ceylon is 

 2-77. 



IV. — Endemic Species. 

 The leading Natural Families (II.) which also contain a large 

 proportion of Endemic Species, are :— 





Number of 



Per cent. 





Endemic species. 





Dipterocarpaceae ... 



45 



97-8 



Melastomacese 



38 



74-5 



Myrtaceae 



26 



56-5 



Rubiaceae 



72 



52*5 



Orchideae 



, 74 



47-7 



Euphorbiaceae 



53 



401 



average proportion 



of endemic species 



in a Nat. 



in Ceylon is 5'27 per cent., but over one-third of the Orders 

 contain no endemic Ceylon species at all. 



Leading Genera (III.) with a large proportion of endemic 

 species are :— ■ 



Number of per ceut 

 Endemic species. 



Strobilanthes ... 25 ... 925 



Memecylon ... 17 73*8 



Hedyotis ••• 15 ... 7l'4 



Eugenia •»/. 25 ... 62-5 



Phyllanthus ... 16 ... 53*3 



The average to each genus is 76 per cent, in the whole 



Flora. 



V. — The following Natural Orders are quite absent from the 

 Ceylon Flora, though all possess species in some other parts of 

 the Eastern tropics : — 



HamamelidecB, Epacridece, Myoporacece, Illecebracece, Cyti- 

 nacece, Juglandece, Myricacea?, Casuarinece, Cupuliferce, Sali- 

 cacece i Gnetacece, Conifer ce t Iridece ) Fhil/iydracece, Restiaccm. 



