BOTANY OP TERRA AUSTRALIS. 19 



hardly found beyond this country. I am acquainted with 

 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, Calothamnus, 

 Beaufortia, and an unpubhshed 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, where 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. 



Leptospermum, of which, nearly 30 Austrahan species 

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

 Moluccas. In Terra Australis its maximum is decidedly 

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

 more abundant in the southern regions than within the 

 tropic. 



Bceclda, to which I refer Imbricaria of Dr. Smith, as pis 

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

 tensive Austrahan 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^.^ I have formerly^ made some 



' CoMBEETACE^. Colyx superus : limbo 4-5-fido, Kquali. Fetala 4-5 vel 

 nulla. Stamina 8-10 ; quandoque laoiniis calycis sequalia et cum iisdem alter- 

 nantia. Ovarium unilooulare, ovulis 2-4, ab apice loculi pendulis absque re- 

 ceptaculo commuiii vel columna central! : Stylus 1 : Stigma 1. Pericarpium 

 monospermum, clausum, figura et textura varium, Drupa v. Samara. Semen ex- 

 albuminosum. Umbryo cotyledonibus SKpius involutis : plumula inoonspioua. 



Arbores Del Irutices. Eolia simplicia, integra,^ ewstipulata, alterna nunc 

 opposita, raro punctato-pellucida. Tlores spicaii, atcillares. 



» Prodi: Jl. Nov. Holt. 351. 



