Natural Orders.'] 
APPENDIX. 
567 
before the ripening of the seed : for previous to the complete developement 
ofthe Embryo the fluid albumen or liquor amnios equally exists in both 
orders ; and although all the genera of Verbenaceae have an Embryo 
whose radicule points towards the base ofthe fruit, yet many of them have 
pendulous seeds, and consequently a radicule remote from the umbilicus. 
Hence Avicennia ,* which I formerly annexed to Mycporinae, should be re- 
stored to Verbenaceae, with which also it much better agrees in habit. 
Myoporince, with the exception of Bontia, a genus of aequinoctial 
America ; and of two species of Myoporum found in the Sandwich Islands, 
has hitherto been observed only in the southern hemisphere, and yet nei- 
ther in South Africa, nor in South America beyond the tropic. Its maximum 
is evidently in the principal parallel of Terra Australis, in every part of 
which it exists ; in the more southern parts of New Holland, and even in 
Van Diemen’s Island it is more frequent than within the tropic. The genus 
Myoporum is also found in New Zealand, Norfolk Island, New Caledonia, 
and the Society Islands. 
PROTEACE/E.* I have formerly* offered several observations both 
on the geographical distribution arid on some of the more remarkable 
points of structure of this order of plants. 1 shall now therefore confine 
myself to a few of the most important facts on each of these subjects. 
Proteacea are chiefly natives of the Southern hemisphere, in which 
they are most abundant in a parallel included between 32° and . 5° lat. 
but they extend as far as 55° S. lat. The few species found in the Northern 
hemisphere occur within the tropic. 
Upwards of 400 species ofthe order are at present known, more than 
half of these are natives of Terra Australis, where they form one of the 
most striking peculiarities of the vegetation. Nearly four-fifths of the 
Australian Proteaceae belong to the principal parallel, in which, however, 
they are very unequally distributed : the number of species at its western 
extremity being to those of the eastern as about 2 to 1, and what is much 
more remarkable, the number even at the eastern extremity being to that 
of the middle of the parallel as at least 4 to 1. From the principal parallel 
the diminution of the order in number of species is nearly equal in both 
* Prodr, Jl. 7iov. holt. 518. 
f Lin. soc. transact. 10. p. 15. 
