Nuytsia 7(2): 201-208 (1990) 
201 
Acacia Miscellany 2. Species related to A. deltoidea (Leguminosae: 
Mimosoideae: Section Plurinerves) from Western Australia 
R.S. Cowan and B.R. Maslin 
Western Australian Herbarium, Department of Conservation and Land Management, 
P.O. Box 104, Como, Western Australia 6152 
Abstract 
Cowan, R.S. & B.R. Maslin. Acacia Miscellany — 2. Species related to A. deltoidea (Leguminosae: Mimosoideae: 
Section Plurinerves) from Western Australia. Nuytsia 7(2): 201-208 (1990). In addition to a key to distinguish the taxa, two 
of which are new (A. vincentii and A. deltoidea subsp. ampla), a new combination under Acacia of Racosperma adenogonia 
Pedley is effected . 
Introduction 
This group of species was treated by Pedley (1987) in a well-illustrated and well-documented 
review, so a further publication on the alliance so soon after Pedley’s might appear redundant. The 
purpose of this paper, however, is to provide names for two new taxa in the group and to make 
available one of Pedley’s names under Acacia; he treated the group as taxa of Racosperma, a course 
we arc not yet prepared to follow. Because full, detailed descriptions are available in his paper, it is 
principally the new taxa that are described below; A. deltoidea is described in full because we have 
extracted from typical A. deltoidea a new species and a new subspecies whose character states alter 
Pedley’s circumscription to some extent. Acacia adenogonia is described fully in order to take into 
account several additional collections beyond those cited by Pedley. 
The taxa of this group are a close-knit assemblage with the possible exception of A. sublanata 
which differs in several respects from the other taxa comprising the group. All are from the north 
tropical and subtropical zones in the Kimberley region of Western Australia and in the Northern 
Territory. 
There is a superficial resemblance of this group of taxa to A. adnata F. Muell. and A. comans W. 
Fitzg. in the A. latipes alliance, which differs from the A. deltoidea group by the presence of basal 
peduncular bracts, separate lateral stipules, and by the lack of a bract on the peduncle above the 
base. In form of the phyllodes there is also a superficial similarity to the uninerved, triangular 
phyllodes of some Phyllodineae, such as those of Maslin’s "A. biflora group" (1978). Pedley 
