Acacia 
concurrent with lower margin near base, secondary 
veins oblique or penniveined, reticulate, base 
asymmetrical or oblique, apex obtuse and 
asymmetric, mucro straight. Glands prominent, 1, at 
pulvinus. Inflorescences on simple axillary peduncles, 
1-4 per axil. Spikes deep yellow to golden, 42-80 mm 
long, 4-7 mm wide, loosely flowered; peduncle 
0-2 mm long, hairy, rachis hairy. Pods stipitate, 
brown, linear to oblong, straight, raised over seeds, 
70-170 mm long, 3.5-5 mm wide, coriaceous, slightly 
resinous, hairy, longitudinally wrinkled, acute. Seeds 
longitudinal in pod, black, flattened oblong, 5.5-8 
mm long, 3.5-4 mm wide. Flowering: Mar - July; 
fruiting: Aug - Oct. Fig. 4 
Top End with extensions into the Qld Gulf and the 
Kimberley. Common in the DR in open forest. 
*A. dunnii (Maiden) Turrill 
Erect shrub or small tree, 3-5 m high, pruinose. 
Bark white, smooth. Branchlets terete, pruinose, 
glabrous. Stipules caducous. Pulvinus 5-20 mm long, 
glabrous. Phyllodes curved or falcate, dimidiate, 
120-365 mm long, 68-162 mm wide, L/W 1.5-2.3, 
typically pruinose, glabrous, primary veins 3-5, 
concurrent with lower margin near base, secondary 
veins oblique or penniveined, reticulate, base 
asymmetrical or oblique, apex acute to obtuse. Glands 
prominent, 3-5, scattered along dorsal margin. 
Inflorescences terminal panicles, axis length 
215-270 mm long. Heads globular, yellow, 8-15 mm 
wide; peduncle 8-20 mm long, pruinose, glabrous. 
Pods stipitate, brown, linear to oblong, straight or 
slightly curved, flat, 61-145 mm long, 24-30 mm 
wide, woody, glaucous or pruinose, glabrous, 
transversely reticulately nerved, margin thickened, 
apiculate. Seeds transverse in pod, brown, oblong to 
ellipsoid, flattened with squarish edges and enclosed 
in membranous sheath in pod, 9-11 mm long, 
7-8 mm wide. Flowering and fruiting sporadically 
throughout the year. Fig. 4 
Kimberley and western VRD on sandstone. 
Commonly cultivated and occasionally an escapee in 
the DR. 
A. farnesiana (L.) Willd. 
Shrub, 1.5-4 m high. Bark smooth, brown to grey. 
Branchlets brown to reddish, terete, lenticular, 
glabrous. Stipules persistent, white, spinose, subulate, 
4-28 mm long, glabrous. Leaves bipinnate. Pulvinus 
1-3 mm long, glabrous. Leaf rachis 5-55 mm long, 
1-4 pairs of pinnae per leaf, hairy on grooved upper 
surface, jugary glands present, interjugary glands 
absent; pinnae 6-32 mm long, 5-14 pairs of leaflets 
MIMOSACEAE 9 
per pinna; /eaflets linear-oblong, flat, 5.5-10 mm long, 
2-3.2 mm wide L/W 2.8-4.3, concolorous, glabrous. 
Inflorescences on simple axillary peduncles. Heads 
globular, yellow, 10-11 mm wide; peduncle 10-28 mm 
long, hairy. Pods stipitate or sessile, dark brown, paler 
on sutures, linear to oblong, straight or curved, 
cylindrical, indehiscent, 40-70 mm long, 8-12 mm 
wide, glabrous, longitudinally wrinkled, apiculate. 
Seeds oblique in pod, olivaceous, irregularly 
ellipsoid, 6-9 mm long, 4.5-5.5 mm wide. Flower- 
ing: June - Aug; fruiting: Nov - Dec. Fig. 3 
Widespread throughout the tropics; in Australia 
from the arid zone to northern Australia; common in 
alluvial situations. Rare in the DR with one record 
from the mouth of the Daly River and several 
collections around Darwin. Pedley (1978) has argued 
that this species is an introduction to Australia but if 
so then the introduction almost certainly occurred 
before white settlement. It is of weedy habit and can 
form dense thickets. 
A. gonocarpa F.Muell. 
Erect shrub, 0.5-2(3) m high. Branchlets angular, 
resinous, glabrous. Stipules persistent, white, linear, 
0.4-0.7 mm long, glabrous. Pulvinus 0.5-1 mm long, 
glabrous. Phyllodes straight, linear, 12-125 mm long, 
(0.6)1-5 mm wide, L/W 9.3-33.3(116), glabrous, 
primary veins 1, secondary veins parallel and widely 
Acacia farnesiana 
Fig. 3 
