392 



R. H. CAMBAGE. 



leaves. One of these is A, myrtifolia, in which case seeds 

 from Sydney and Adelaide were examined (Part II, p. 157). 

 Plants recently raised from seeds of this species, kindly 

 forwarded to me by Professor W. G. Woolnough, from 

 Mount Melville, Albany, Western Australia, have produced 

 an opposite pair of pinnate leaves, thus showing an interest- 

 ing constancy. 



Simply-pinnate Leaves. 



When speaking of simply-pinnate and bipinnate leaves in 

 Part I of this series, it was pointed out that a simply- 

 pinnate leaf had not so far been observed above the third 

 leaf on an Acacia seedling, nor at all on an Acacia sucker. 1 

 Early this year, however, Mr. J. J. Fletcher, b.Sc, found 

 several such leaves on specimens of A. suaveolens growing 

 at Woolwich, near Sydney, and which he kindly handed to 

 me. Others have since been found by me at La Perouse. 

 These simply-pinnate leaves were growing in pairs, one on 

 each side of the base of bipinnate leaves which had appeared 

 as reversion foliage, among the phyllodes at heights up to 

 four or five feet from the ground, and were apparently the 

 result of some pathological trouble around the growing- 

 point of the plants. Bipinnate leaves are common on 

 adventitious growths of phyllodineous Acacias. 



In June of this year I found one example of a simply- 

 pinnate leaf on a sucker of Acacia Dorothea Maiden, at 

 Mount Victoria, and later, several were found on suckers 

 of this species, and of A, obtusata var. Hamiltoni Maiden, 

 at Leura. These discoveries go to suggest that extended 

 search may reveal more examples of both features among 

 various species. 



Number of Pinnae on one Leaf. 

 In Part I, (p. 90) it was mentioned that in a few species 

 the pinnae increase on some of the succeeding leaves to 

 several pairs. Theremark referred to phyllodineous Acacias. 



1 This Journal, xlix, p. 90 (1915). 



