546 
APPENDIX. [ Botany of Terra Australis. 
which, however, where many of the peculiarities in the vegetation of the 
parallel are less remarkable, or entirely wanting, it may be said to abound. 
Eriostemon , which appears to be most abundant at the eastern ex- 
tremity of the principal parallel, has not been observed either at its western 
extremity or intermediate part; it extends, however, to the south end ot 
Van Diemen’s Island on the one hand, and within the tropic as far as En- 
deavour River on the other. 
Phehalium, very nearly related to Eriostemon, has like that genus its 
maximum at the eastern extremity of the principal parallel, it is found also 
at the western extremity of this parallel, and as far as the south end ot V an 
Diemen’s Island, but it has not been observed within the tropic. 
Zieria seems to be limited to the eastern extremity of the principal 
parallel, and the more southern regions. 
The most remarkable plant of the order with regard to structure, is 
that imperfectly figured and described in Dampier’s voyage.'* Of this 
genus, which may be named Diplol^na, 1 have examined Dampier’s origi- 
nal specimen in the Sherardian Herbarium at Oxford, and others recently 
collected, also at Shark’s Bay, in the voyage of captain Baudin, and have 
ascertained that what appear to be calyx and corolla in this singular plant, 
are in fact a double Involucrum containing many decandrous flowers, whose 
Stamina and Pistil la exactly agree with those of the order, but of which 
the proper floral envelopes are reduced to a few irregularly placed scales. 
Another Australian genus of Diosmese differs from the rest of the 
order in having a calyx with ten divisions, an equal number of petals, and 
an indefinite number of stamina with evidently perigynous insertion. 
MXRTACEJS.'f' This is one of the most extensive tribes in Terra 
Australis, in which considerably above 200 species have already been ob- 
served, and where the order is also more strikingly modified than in any 
other part of the world. It is very generally spread over the whole of Aus- 
tralia, but its maximum appears to be in the principal parallel. Many 
observations might here with propriety be introduced on the more re- 
markable structures which occur among the Australian Myrtaceae; I must 
* Vol. 3, p. 110, tab. 3, f. 3. 
f Myrti. Juss. gen . 322. 
