BOTANY OF TERRA AUSTRALIS. 19 



hardly found beyond this country. I am acquainted witli 

 one exception only, in an additional species which is said to 

 be a native of Amboyna. 



Next to Eucalyptus in number, is the beautiful genus 

 Melaleuca, of which upwards of 30 Australian species have 

 already been observed, exclusive of Tristania, Calothannius, 

 Beaufortia, and an unpublished genus which I separate 

 from it. The maximum of Melaleuca exists in the prin- 

 cipal parallel, but it declines less towards the south than 

 within the tropic, Avhere its species are chiefly of that sec- 

 tion which gradually passes into Callistemon, a genus 

 formed of those species of Metrosideros that have inflores- 

 cence similar to that of Melaleuca, and distinct elongated 

 filaments. With the exception of two species of this sec- 

 tion, namely, Melaleuca leucadendron, and M. Cajeputi, the 

 genus Melaleuca appears to be confined to Terra Australis. 



Lejjtospermiim, of which, nearly 30 Australian species 

 have been observed, exists also in New Zealand and in the 

 Moluccas. In Terra Austrahs its maximum is decidedly 

 in the principal parallel, and like Melaleuca, it is much 

 more abundant in the southern regions than within the 

 tropic. 



BacJiia, to which I refer Imbricaria of Dr. Smith, as [5^ 

 well as the opposite-leaved Leptospermums, is also an ex- 

 tensive Australian genus, having its maximum in the prin- 

 cipal parallel, extending like the two former genera to the 

 highest southern latitude, and hardly existing within the 

 tropic : one species, however, has been found in New Cale- 

 donia, and that from which the genus was formed is a 

 native of China. 



COMBRETACE/E.^ I have formerly" made some 



1 CoMBRETACEiE. Cali/x siipcrus : limbo 4-.5-fido, a?qiiali. VetaJa l-S vcl 

 nulla. Stamina 8-10 ; quandoque laciniis calycis cTqualia et cum iisdcm alter- 

 nautia. Ovarinm unilocularc, ovulis 2-1, ab apicc loculi pendulis absque rc- 

 ccplaculo communi vcl coliinma central! : Sfj/lus 1 : Stu/iua 1. Fericarpium 

 monospermuni, clausum, figuva et textura varium, Drupa v. Samara. Semen cx- 

 albuminosum. Emhnjo coljlcdonibus sfcpius involutis : plumula inconspicua. 



Arbores vel Frutices. Folia simplicia, inlctjra, exsiipnlala, altenia nutic 

 opposita, ra) o pimdato-pellucida. Tlorcs spicaii, a.villarcs. 



"^ Prodr.Jl.Kov.IIoU. 351. 



