84 R. H. CAMBAGE. 



lophantha, Willd., (regarded as an Albizzia by Bentham), 

 A. aeantliocarpa, Willd., and A. dealbata. 



The four species so far noticed which constantly have an 

 opposite pair of simply-pinnate leaves are:— Uninerves — 

 Racemosse: A. leiophylla, Benth., A. salicina, Lindl., var, 

 varians, and var. Wayce, Maiden, A. my Hi folia, Willd . 



Bipinnat^e — Gummiferse: A. Farnesiana, Willd. 



This feature was first noticed on seedlings of A. Farnesi- 

 ana and next on those of A. myrtifolia. As the former is 

 the only Acacia known to occur in Africa, Asia and 

 America as well as Australia, and the latter is one of the 

 most widely spread in Australia, it was considered that 

 possibly these are among the older forms and that the more 

 recent species have lost one pinnate leaf. Prompted by 

 the assumption that the widely spread species are the 

 oldest, which of course is by no means a certainty, and that 

 those with a pair of simply-pinnate leaves are in some way 

 connected with such a group, an effort was made to procure 

 seeds of A. salicina, another widely spread species recorded 

 from all the States of the mainland of Australia. Seeds of 

 the type were not obtainable, but some of the variety 

 Wayce, grown at the Sydney Botanic Gardens, were 

 obtained from Mr. J. H. Maiden, and later those of the 

 variety varians were forwarded by Mr. H. O. Oullen from 

 near Barcaldine in Queensland. Both of these varieties 

 produced seedlings with the opposite pair of pinnate leaves, 

 and subsequently the feature has been noticed on seedlings 

 of A. leiophylla, a West Australian species, with a more 

 restricted range. Probably other examples may be found 

 later. 



If those species with only one pinnate leaf have been 

 developed from an older type with two pinnate leaves, then 

 it seems reasonable to expect that the newer form will 



