20 GENERAL REMAEKS ON THE 



remarks on the structure and limits of Combretacese, one of 

 whose principal characters consists in the unilocular ovarium 

 with two or more ovula simply pendulous from the upper 

 part of its cavity, and not inserted, as in Santalacese, into 

 a central receptacle or column. Guiera of Jussieu, having 

 the same structure, and also leaves dotted with pellucid 

 glands, appears to connect this order with Myrtacese. 



The Australian Combretacese, whicli belong to Termi- 

 nalia, Chuncoa, and Laguncularia, are not numerous, and 

 all of them are found within the tropic. 



CUNONIACE^.^ This order, several of whose genera 

 have been referred to Saxifragese, is more readily distin- 

 guished from that family by its widely different habit, than 

 by any very important characters in its fructification ; like 

 sm Saxifrageae also it comprehends genera with ovarium 

 superum and inferum. 



The genera strictly belonging to Cunoniacem are Wein- 

 mannia, Cunonia, Ceratopetalum, Calycomis, and Codia. 

 To this order Bauera may also be referred, but it must 

 form a separate section from the genera already mentioned. 

 Of these Weinmannia, Ceratopetalum and Calycomis are 

 found in Terra Australis, and hitherto only at the eastern 

 extremity of its principal parallel, where also Bauera is 

 most abundant ; but this genus is found beyond the parallel 

 in one direction, extending to the southern extremity of 

 Van Dieraen's Island. 



RHIZOPHOREtE.^ The genera Rhizophora, Bruguiera, 



1 Cunoniacem. Calyx 1-pli. 4-5-fidus, semisuperus vel iiiferus. Fetala 

 4-5 ; rarb nulla. Stamina perigyna, defiiiita, 8-l(J. Ovarium biloculare, loculis 

 2-polyspermis : Stylus^ 1-2. Pericardium biloculare, capsulare vel clausum. 

 Embryo in axi albuminis carnosi. 



Arbores »«; Frutices. Folia opposita, composita vel simplicia, sapius stipu- 

 lata stipulis interpeliolarihus. 



2 RiiizoPHOEEiE. Calyx superus 4-5-fidus, sestiratione valvata. Fetala 

 4-5. Stamina perigyna, 8-15. Ovarium 2-loc. Icciilis 2-polyspermis ovulis 

 penduhs: Styhis 1. Fericarpium clausum, monospermum. Seme?i exalbu- 

 mmosum. Embryo ssepe germinans et pericarpium semisuperum perforans. 



Arbores, Folia opposita, simplicia, stipulis interpetiolaribus. 



