164 J. H. MAIDEN. 



I have taken cognizance of some genera from India and other 

 parts of the world represented in Australia, but which although 

 producing exudations in their native country have not yet been 

 found to yield them in Australia. The line of enquiry is suggestive 

 and if followed up may lead to the discovery of exudations that 

 have hitherto been passed over. As regards those exudations I 

 have included from Polynesia, I have included them for the 

 reason which weighed with me in regard to the Indian genera; 

 I also was guided by a feeling that as these islands are practically 

 adjacent to Australia, it would be a convenient arrangement to 

 include them in any general account of the vegetable exudations 

 of that continent. 



CAPPARIDEiE. 



Capparis nobilis, F.v.M., "Wild Lemon." 



The gum consists almost wholly of Pararabin and resembles 

 those of the Sterculiacese. See Maiden and Smith (63) 1 



Pittospore^. 

 The genus Pittosporum is one which yields both gums and resins.. 

 See Maiden (56). 



Pittosporum phillyrceoides, DC, (Syn. P. acacioides, A. Cunn.),. 

 "Native Willow," etc. 



"Several Acacise useful . . . for their gum; but the latter 

 is even excelled in clearness and solubility by that obtained from 

 Piltosporum acacioides." (Mueller, First General Report,. 1853,. 

 p. 6.) 

 Pittosporum undulatum, Vent. Our common native Pittosporum.. 



For an investigation of this gum-resin see Maiden (56). Dr* 

 Lauterer (33) has also examined a soft resin from this tree. 



Pittosporum rhombifolium, A. Cunn. 



Yields a gum-resin apparently similar to the preceding. 



Pittosporum bicolor, Hook., "Bonewood," "Whitewood." 



The exudation of this species is a gum-resin which holds an 

 essential oil incorporated with it. See Maiden (56). 

 1 See "Bibliography," at the end of paper. 



