578 
APPENDIX. [ Botany of Terra Australis. 
this respect and in the more important character of the position of the 
Embryo Juncese differ also from Restiacefe, to which they more nearly 
approach in habit. 
Three very remarkable genera, which I have referred to Juncese, are 
peculiar to Terra Australis. Of two of these Calectasia and Dasypogon, 
each consisting of only one species, figures and descriptions are annexed to 
this essay. 
Of the third, X erotes, 24 species have already been observed. Phis 
genus is somewhat more abundant in the principal parallel than in othei 
parts ; but it is very generally extended, and is more frequent within the 
tropic than in Van Diemen’s Island. Xerotes, in the structure and appear- 
ance of its flowers and in the texture of Albumen, has a considerable re- 
semblance to Palms, but it wants the peculiar characters of the seed and 
also the habit of that remarkable order. 
Flagettaria, which I have added to Juncese, differs from Xerotes 
chiefly in its pericarpium, and in the form and relation of its Embryo to the 
Albumen, which is also of a different texture ; in all these respects it ap- 
proaches to Cyperaceae, with some of whose genera it has even a certain 
resemblance in habit. This genus has usually been found only within 
the tropics, but in New Holland it extends as far as 33 S. lat. 
Philydrum, which I have annexed to Junceae, has always appeared 
to me an insulated genus, yet though not referable to any established 
natural order, it may be compared with several in certain respects. In 
the structure of its stamina it may in one point of view be said to be inter- 
mediate between Scitaminem and OrchideJ ; in that of its pericarpium 
and even of its seeds it has some affinity to the latter order , yet it 
differs from both of them in almost every Other respect. In general ap- 
pearance, it bears a considerable resemblance to Cartonema, which be- 
longs to Commelinese. In some parts of its structure it may be compared 
with Xyris, and perhaps with Burmannia ; a genus which 1 have likewise 
annexed to Juncem, but whose real affinities are equally obscure. 
Philydrum pygmeeum, differs in so many respects from I . lanuginosum 
that it may probably hereafter be considered a distinct genus , and a very 
few additions to this tribe of plants would sanction their formation into a 
separate natural order. 
