XXXVlli INTRODUCTION. 
author. With regard to Eucalyptus multiflora, Rich*, from Mindanao, one of the 
Philippine Islands, there is also great doubt as to the genus; and no species of Euca- 
lyptus is in any of the older or the large recent collections at Kew from that archi- 
‘pelago. Therefore the range of the genus Eucalyptus, so far as it is known with 
absolute certainty, is from Tasmania to New Guinea and Timor, and it is essentially a 
warm temperate type. Acacia, on the other hand, is almost wholly tropical in its 
distribution outside of Australia, and the phyllodineous section, which numbers hard 
upon 300 species in Australia, exhibits some much wider and very remarkable exten- 
sions. Two or three species of this section inhabit New Caledonia and other islands 
of the South Pacific. Acacia richit is a native of the Fiji Islands, and specimens in- 
distinguishable from it have been collected in Formosa, separated by forty degrees of 
latitude and sixty of longitude, though it may exist and yet be found in some inter- 
mediate stations. Another species (A. heterophylla) is indigenous in Mauritius and 
Bourbon, and possibly also in Madagascar, and the Sandwich-Island A. koa is so near 
it that the late Mr. Bentham was of opinion that it was a form of that speciesf. 
The capsular Myrtacez, which are so specially Australian (New Zealand and New 
Caledonia) extend to China and the Malayan peninsula, where they are represented by 
one, or in some instances two or three species, of the genera Baeckea, Leptospermum, 
Tristania, and Melaleuca. Xanthostemon, another genus of the same group, is con-. 
fined to Australia and New Caledonia, with the exception of the Philippine Island 
A. verdugonianus. Stylidium is perhaps the only strictly Australian type extending 
into the heart of India, even to the foot of the Sikkim Himalaya. It is a genus 
numbering eighty-five Australian species and three Indian—one of the latter being also 
a native of North Australia, a second scarcely more than a variety of it, while the third 
is quite distinct. Leucopogon, an Australian Epacrideous genus of nearly 120 species, 
extends to the Philippines, yet there are only two species known from the whole Malay 
Archipelago. Helicia is apparently the only genus of the Proteacee extending north 
of New Guinea into Asia, and this, although represented in Australia, has its greatest 
concentration in Malaya and India—ten species being found within the limits of British 
India, three of which inhabit Ceylon and the Western Deccan peninsula. One species 
is a native of Japan, and one, or more, of South China and Formosa. 
Extensions of Australian types into Eastern Polynesia are relatively more numerous 
than into Malaya, yet they do not predominate over the other elements of these small 
insular floras; and there is such an intermingling of American, Asiatic, and Australian 
types in the much more highly-developed Sandwich-Island Flora, that it cannot, 
* A. Gray, Botany U.S. Exploring Expedition, i. p. 554. 
+ Mr. J. G. Baker informs us, on the authority of Mr. Baron, that there is a possible chance of his lately- 
described Acacia atphoclada, from Madagascar, being an introduced Australian species. 
t In addition to A. koa, two endemic species are described in Hillebrand’s lately-published ‘Flora of the 
Hawaiian Islands.’ . 
