20 GENERAL REMARKS ON THE 



remarks on the structure and limits of Combretaceae, one of 

 whose pruicipal 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 wdth pellucid 

 glands, appears to connect this order Avitli Myrtaceae. 



The Australian Combretacese, which loelong to Ternii- 

 nalia; Chuucoa, 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 Saxifrageae, is more readily distin- 

 guished from that family by its widely different habit, than 

 by any very important characters in its fructification ; hke 

 549] Saxifrageae also it comprehends genera with ovarium 

 superum and infer um. 



The genera strictly belonging to CunoniacecB 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 JFeinmamiia, Ceratopetalum and Calycomis are 

 found in Terra Australis, and hitherto onlv 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 Diemen's Island. 



RHIZOPHORE/E.' The genera Rhizophora, Bruguiera, 



I CuyoNiACE.^. Calyx 1-pli. 4-5-fidus, semisuperus vel inferus. Petala 

 4-5 ; rarb nulla. Stamina perigyiia, definita, 8-lU. Ovarium biloculare, loculis 

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

 Embryo in axi albuminis carnosi. 



Arbures vel Frutices. Tolia opposita^ composila vel simplicia^ scepius stipu- 

 lata stipulis interpeiiolaribus. 



- RuizoniORE.^. Calyx superus 4-5-fidus, sestivatione valvata. Petala 

 4-5. Stamina perigyna, 8-15. Ovarium, 2-loc. Icculis 2-polyspcrmis ovulis 

 pendulis : Stylus 1. Fericarpium clausum, monosperraum. Semen exaibu- 

 minosum. Embryo soepe germinans et pericarpium samisuperum perforaus. 



Arbores. Tolia opposita, simplicia, stipulis interpeiiolaribus. 



