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APPENDIX. [ Botany of Terra Australis. 
and it would be in vain to attempt a definition of an order composed of such 
heterogeneous materials. By the separation of the order here proposed it 
becomes at least practicable to define Onagrari*. It is still however, 
difficult to characterise Haloragese, which will probably be best understood 
by considering as the type of the order the genus Ilaloragis, from which all 
the others differ by the suppression of parts or separation of sexes. Thus 
Meionectes, an unpublished genus of New Holland, is reduced to half the 
number of parts both of flower and fruit, Proserpinaca is deprived of petals 
and of one fourth of all the other parts. Myriophyllum, which is monoecious, 
, has the complete number of parts in the male flower, but in the female 
wants both calyx and corolla ; what several authors have described as 
petals being certainly bractese. 
Serpicula differs from Myriophyllum in having only half the number 
of stamina in the male flower, and in its unilocular four-seeded ovarium. 
Hippuris, though retaining the habit of Myriophyllum, yet having a 
monandrous hermaphrodite flower without petals, and a single-seeded ova- 
rium, is less certainly reducible to this order : and it may appear still more 
paradoxical to unite with it Callitriche , in which, however, I am inclined to 
consider what authors have denominated petals as rather analogous to the 
brae tern in the female flower of Myriophyllum and Serpicula, and to both 
these genera Callitriche in the structure of its pistillum, and even in habit 
very nearly approaches. 
The Australian genera of this order are Ilaloragis, Meionectes, Myrio- 
phyllum, and Callitriche. 
Of Ilaloragis, many new species have been observed in Terra Aus- 
tralis, in every part of which this genus is found, most abundantly however 
at both extremities of the principal parallel. 
That Gonocarpus really belongs to the same genus, I am satisfied 
from an examination of original specimens sent by Thunberg himself, to 
Sir Joseph Banks, for in these I find not only petals, but eight stamina and 
a quadrilocular ovarium. 
LEGUMINOSiE.* This extensive tribe may be considered as a 
class divisible into at least three orders, to which proper names should be 
