ON THE NORTH AUSTRALIAN EXPEDITION. 141 



ratnlrenia, JRulingia, Oxylohium, Gompholohium, Lhotskya, Try- 

 ptomene, Astartea, Harmoyia, Theroyeron, Cyclotheca, EremopJiila, 

 PhoUdia, JPithyrodia, Halgania, and Cladium. Not less than sixty 

 genera were observed during the progress of the expedition, which, 

 although established in the floras of other countries, remained 

 unnoticed by any writer on Australian botany : viz. 8tephania, 

 Abelmoschus, Adansonia, Helicteres, Melochia, Hiedleya, Melhania, 

 Ximenia, Glycosmis, Hijppocratea, Bergia, Nephelium, Cardio- 

 spermwn, Azadirachta, Westonia, Wistaria, Agati, JEschynomenej 

 Lourea, Dicerma, Taverniera, Atylosia, Rhynchosia, TepJirosia, 

 Parinarium, Ltimnitzera, Ludwigia, Luffa, ZeTineria, Trianihema, 

 Sesuvium, Mappa, Baloghiu, Bridelia, Leptonema, Bluchea, Spi- 

 lunthes, Soliva, Saplotaxis, Alstonia, Cerhera, Melodinus, Hydrolea, 

 Bonnaya, Beplidium^ Bhamphicarpa, AdJiatoda, Bicliptera, Ade- 

 nosmos, Teucridium, Helicia, Ephedra, Ouvirandra, Aponogeton, 

 Hydrocharis, Cyanotis, Typhonium, Oryza, Campyloneuron, and 

 Geratopteris. 



A number of genera, at least quite as large as that of the pre- 

 ceding series, are not referable to any hitherto described, and will 

 prove, I trust, a valuable contribution towards the botanical 

 system, inasmuch as the discovery of new generic types assists 

 in disclosing the laws of affinity in nature, connecting often those 

 forms which are isolated by wide chasms, and aiding thus in the 

 advancement and accomplishment of a truly natural system of the 

 whole existing vegetation. 



The amount of plants added by our travels to the Australian 

 flora approaches to 800 species. A few of them are incidentally 

 mentioned in the works previously quoted, none however intro- 

 duced by systematical descriptions. How many of these are 

 really new to science, and how many identical with Indian or 

 Pacific forms, can only be ascertained by a comparison of Eu- 

 ropean collections, and by access to a more extensive library than 

 I have here at my command. Still I am under the impression 

 that at least 500 of the additional plants are peculiar to Australia, 

 and these must therefore be considered as contributions entirely 

 new to botany. 



According to a computation instituted in 1849 by E. Brown (in 

 the Appendix to Sturt's ' Central Australia,' ii. pp. 90, 91), the 

 number of plants known from New Holland and Van Diemen's 

 Land scarcely amounted to 7000. Botanical researches in West 

 Australia, Tasmania, South Australia and the colony of Victoria, 



