230 J. H. MAIDEN. 



The Queensland form displays the following interesting 

 morphological character. The flower falls from the rachis 

 without a calyx; in other words the corolla comes out 

 "clean." This appears to be caused by a fusion of the 

 truncate calyx with the floral bract. This forms a ferrugin- 

 ous honey-comb like membrane (membrana favosus), which 

 surrounds the flowers on the rachis, and separates into 

 irregular pieces, becoming deciduous some time after the 

 flower (corolla) has fallen. 



Affinities. 

 Its closest relations are J., argentea and A. glaucescens, 



1. With A. argentea Maiden in Proc. Roy. Soc. Q., xxx r 

 41. A. argentea is a slender shrub up to ten feet high; 

 A. Burrowi is a small or medium sized tree; the petals of 

 the former species are reflexed and the calyx completely 

 hairy; the seeds in the former are brown, in the latter black. 

 While the species are undoubtedly different, there may be 

 a good deal of similarity in the phyllodes and also in the 

 pods. 



2. With A. glaucescens Willd. This is figured at Plate 

 145, Vol. iv, of my "Forest Flora of New South Wales." 

 The species are allied, but in A. glaucescens the phyllodes 

 are, as a general rule, larger and more glaucous, the calyx 

 is smaller in proportion to the petals, both calyx and petals 

 are more hairy, the floral bract is different, the spikes are 

 larger and the valves hairy. 



3. With A. Kempeana F.v.M. This species is figured in 

 Mueller's "Iconography of Acacias." The phyllodes of the 

 tw r o species are a good deal similar, particularly the bluntly 

 lanceolate Girilambone specimens of A. Burrowi, but the 

 calyx in A. Kempeana is much smaller in proportion to the 

 petals, the ovarium is smooth, while the broad pod and 

 arrangement of the seeds in A. Kempeana are sharply 

 different from those of A. Burrowi. In the absence of 



