6 MIMOSACEAE Acacia 
32.  Phyllodes with two or more principal longitudinal nerves confluent near base .........++..+++- 34 
32s Neryes.alliseparate,to, base, of phy llodelte.catasvisrcs attic ese TT 33 
33. Glands on phyllode 1, near base; flower heads yellow; pods 9-14 mm wide; 
seedslongitudinallin pod<//mm longer esier.cscnlertitriier intitle eerie teed A. hemignosta 
33. Glands on phyllode 4-5, scattered along dorsal margin; flower heads cream to white; 
pods 20-28 mm wide; seeds transverse in pod, c. 10 MM 1ONg......ssessssecsseesseessseeseeesseess A. mimula 
34. Branchlets prominently flattened, not pruinose 
34. Branchlets terete, pruinose 
A. tolmerensis 
Pielitriitttttscsresttecessecesteenstieet teri TCet tre 35 
35. Phyllodes >68 mm,wide, 1.5-2.3 times as long as wide; flower heads yellow; 
pod margin thickened but not winged 
A. dunnii 
35. Phyllodes <68 mm wide, 2.5-5.2 times as long as wide; flower heads white to cream; 
pod margin with wing 1.5-3 mm broad .........cec 
36. Leaves with >8 pairs of pinnae 
36. Leaves with <S pairs of pinnae 
37. Small tree; leaf pinnae >75 mm long 
37. Shrub; leaf pinnae <40 mm long 
38. Flowers in spikes 
38. Flowers in heads 
39. Leaflets <3 mm long 
39. Leaflets >5 mm long 
A. alleniana Maiden 
Erect shrub or rarely a small tree, 2-4 m high. Bark 
smooth. Branchlets pendulous, terete, glabrous. 
Stipules caducous. Pulvinus 1.5 mm long, glabrous. 
Phyllodes straight, linear, quadrangular, 120-200 mm 
long, 0.6-1 mm wide, L/W 150-200, punctulate 
and/or slightly tuberculate, flaccid, glabrous, veins 
obscure, apex pungent or subulate, mucro oblique or 
hooked. Glands inconspicuous or absent. Inflores- 
cences on simple axillary peduncles. Heads globular, 
yellow, 4-5 mm wide; peduncle 5-14 mm long, 
glabrous. Pods stipitate, brown, linear to oblong, 
straight, raised over seeds alternately on each side, 40- 
140 mm long, 4-5 mm wide, coriaceous, smooth, 
glabrous, nerves obscure or absent, margin thickened 
slightly, acute. Seeds longitudinal in pod, brown, 
flattened oblong, 5-6 mm long, 2.5 mm wide. 
Flowering: Feb - April; fruiting: Mar - Oct. Fig. 2 
In the NT north of 20° S but within the DR 
restricted to southern parts on sandstone and on 
Melville Island. 
A. aulacocarpa Cunn. ex Benth. 
Erect long-lived tree, 3-10 m high, slightly mealy 
or hoary due to whitish vernicose covering. Bark grey, 
fissured. Branchlets terete, glabrous. Stipules 
persistent, brown, triangular, 0.5 mm long, glabrous. 
Pulvinus 2-6 mm long, glabrous. Phyllodes curved or 
falcate, dimidiate or elliptic, 55-185 mm long, 
A. platycarpa 
38 
37 
A. pachyphloia 
A. farnesiana 
A. catechu 
39 
A. ‘Douglas R.’ 
A. pallidifolia 
9-35 mm wide, L/W 3.4-9, glabrous, primary veins 
obscure, secondary veins parallel and closely spaced, 
not anastomosing, base attenuate, apex acute, mucro 
hooked. Glands 1, at pulvinus. Inflorescences on 
simple axillary peduncles, 1-4 per axil. Spikes 
yellow, 18-40 mm long, 3-3.5 mm wide, densely 
flowered; peduncle 2-6 mm long, glabrous. Pods 
stipitate, brown, linear to oblong, twisted or rarely 
straight, flat, 21-90 mm long, 14-21 mm wide, woody, 
mealy or hoary with dried resin, glabrous, more or less 
transversely reticulately nerved, apiculate and 
asymmetric. Seeds oblique in pod, brown, flattened 
oblong, 5-6 mm long, 3-3.5 mm wide. Flowering: 
Feb - June; fruiting: Aug - Nov. Fig. 2 
Distributed coastally from the Kimberley to Cape 
York and northern NSW and also in New Guinea. 
Widespread in DR in woodland or open forest, often 
on skeletal soils. 
A. auriculiformis Cunn. ex Benth. 
Erect tree, 6-20 m high. Bark dark grey, 
fissured. Branchlets angular, glabrous. Stipules 
persistent, reddish, triangular, 1 mm long, glabrous. 
Pulvinus 3-5 mm long, glabrous. Phyllodes curved 
or falcate, lanceolate to elliptic to oblanceolate, 
95-220 mm long, 12-37(52) mm wide, L/W 4-12, 
glabrous, primary veins 3, secondary veins parallel 
and widely spaced, sparsely or loosely anastomosing, 
base attenuate, apex acute. Glands prominent, 1, at 
