Natural Orders .] 
APPENDIX. 
541 
consists of Abroma, Commersonia, Lasiopetalum, and several unpublished 
genera, intermediate to the two last. 
The greater part of the order exists in the principal parallel, very 
few species have been observed within the tropic, and one only in Van 
Diemen’s Island. 
Lasiopetalum , the most extensive genus of the family, was esta- 
blished by Dr Smith,* who considered it to belong to Ericese. Ventenath 
taking a different view of its structure, has assigned some plausible rea- 
sons for referring it to Rhamnese. From both these orders it appears to 
me sufficiently distinct, and it is certainly more nearly related to the genera 
with which I have placed it. 
DILLENIACEj®. It was first, 1 believe, proposed by Mr. Salisbury 
to separate Dillenia, Wormia, Hibbertia, and Candollea from the Magnolife 
of Jussieu, and to form them into a distinct order, which he has called 
Dillenem. X It is remarkable that Decandollc, § who has adopted this 
order, should also limit it to these genera, Jussieu || having previously 
suggested the separation of Dillenia from Magnoliae and its combination 
with Tetracera and Curatella, genera which certainly belong to Dilleniaceae, 
as do also Pleuirandra of Labillardiere H and Ilemistemma of Du Petit 
Thouars.** 
The Dilleniaceae appear to be more abundant in Terra Australis than 
in any other part of the world, nearly 70 Australian species having already 
been observed ; most of these belong to Hibbertia and Pleurandra, both of 
which are very generally diffused, their maximum, however, is in the prin- 
cipal parallel, to the western extremity of which Candollea seems to be 
limited. Ilemistemma, Worrrtia, and an unpublished genus remarkable 
shnplicia. Capsula 3-5-loe. Semina : umbilico strophiolato. Embryo erectus, in axi 
albuminis carnosi cujus dimidio longior. Frutices raro Arbqres, puhe scope stellari. 
Folia altepna, simplicia , stipulata , saepius dentata. Pedunculi subeymosi, oppositifoHi ; 
pedicel lis utplurinium bracteatis. 
* Linn. soc. transact. 4, p. 216. t Malmais. 59. Dec.- gen. nov. p. 7- 
t Paradis. Land. 73- § Annates du mus. 17, }>• 400. 
H Annales du mus. 14. pp- 129-130- 11 Plant. Nov. Hall. 2. p. 5. 
** Gen- nov. Madagasc. n. 61. 
