548 
APPENDIX. [ Botany of Terra Australis. 
BacUa , to which 1 refer Imbricaria of Dr. Smith, as well as the 
opposite-leaved Leptospermums, is also an extensive Australian genus, 
having its maximum in the principal parallel, extending like the two for- 
mer genera to the highest southern latitude, and hardly existing within the 
tropic : one species, however, has been found in New Caledonia, and that 
from which the genus was formed is a native of China. 
COMBRETACEiE.* I have formerly^ made some remarks on the 
structure and limits of Combretaee®, 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 Santalace®, into 
a central receptacle or column. Guiera of Jussieu, having the same struc- 
ture, and also leaves dotted with pellucid glands, appears to connect this 
order with Myrtace®. 
The Australian Combretaee®, which belong to Terminalia, Chuncoa, 
and Laguncularia, are not numerous, and all of them are found within the 
tropic. 
CUNONIACE/E X- This order, several of whose genera have been 
referred to Saxifrage®, is more readily distinguished from that family by its 
widely different habit, than by any very important characters in its fructifi- 
* Combrbtacej!. Calyx superus: limbo 4-5-fido, sequali. Pel ala 4-5. vel nulla. 
Stamina 8-10 ; quandoque laciniis calycis aequalia et cum iisdem altcrnantia. Ovarium 
umloculare, ovulis 2-4, ah apice loculi pendulis absque receptaculo communi vel columna 
ccr.tiali . Stylus 1 . Stigma 1. Pericarpiurh monospermum, clausum, figura et textura 
varium, Drupa v. Samara. Semen exalbuminosum. Embryo cotyledonibus stepius invo- 
lutis: plumula inconspicua. 
Arbores vel Frutices. Folia simplicia, Integra, exstipulata, alterna nunc opposita, 
raro punctato-pellucida. Flores spicati, axillares. 
f Prodr jl. nov. If oil . 851, 
t Cunoniacejs. Calyx 1-ph. 4-5-fidus, semisuperus vel inferus. Pet ala 4- 5; rard 
nulla. Stamina perigyna, definita, 8-10. Ovarium biloculare, loculis 2-polyspermis : 
Stylus 1-2. 1 ericarpium biloculare, capsulare vel clausum. Embryo in axi albuminis 
carnosi. 
Arbores vel frutices. Folia opposita, composita vel simplicia, sccpius stipulata sti - 
pulis interpetiolaribus. 
