Acacia MIMOSACEAE 19 
transversely reticulately nerved; margin winged, 
1.5-3 mm wide; acute. Seeds transverse in pod, brown, 
flattened ellipsoid, 8-9 mm long, 6-7 mm wide. 
Flowering: Nov - Mar; fruiting: May - Sept. Fig. 9 
Northern Australia from Cape York to the 
Kimberley. Scattered in the DR in open forest. More 
common in the Katherine area. Measurements were 
made on specimens from the Darwin/Katherine area 
as material from the Gulf and the Kimberley shows 
considerable variation. 
A. plectocarpa Cunn. ex Benth. 
Tall shrub or small tree, 3-7 m high. Bark grey, 
fissured. Branchlets angular, glabrous. Stipules 
persistent, reddish, triangular, 0.8 mm long, 
glabrous. Pulvinus 2-4 mm long, glabrous. Phyllodes 
straight or curved, narrowly elliptic to linear, 120-195 
mm long, 4.5-13 mm wide, L/W 12-31, glabrous, 
primary veins 1 with 2 prominent secondary 
veins, secondary veins parallel and closely spaced, 
not anastomosing, base attenuate, apex acute, 
mucro oblique or straight. Glands 1, at pulvinus. 
Inflorescences on simple axillary peduncles, 1-3 per 
axil. Spikes yellow, 15-55 mm long, 3-4 mm wide, 
densely flowered; peduncle 1-4.5 mm long, 
slightly resinous, glabrous, rachis glabrous. Pods 
stipitate, brown, linear to oblong, straight, raised 
Over seeds alternately on each side, 53-80 mm 
long, 6-12 mm wide, coriaceous, resinous, glabrous, 
nerves obscure, obtuse. Seeds transverse in 
pod, black, discoid to ellipsoid, 4-4.2 mm long, 
2.5-3.7 mm wide. Flowering: May - July; fruiting: 
July - Nov. Fig. 9 
Eastern Arnhem Land to the Kimberley in open 
forest on sandy soils. Not common in the DR. 
A. praelongata F.Muell. 
Tree, 3-8 m high. Bark dark brown to black, 
fissured. Branchlets pendulous, ribbed to angular with 
swollen leaf nodes, glabrous. Stipules caducous. 
Pulvinus 1-1.5 mm long, glabrous. Phyllodes straight, 
linear, 120-205 mm long, 1-2.5 mm wide, L/W 
74-180, coriaceous, glabrous, primary veins 1, 
secondary veins parallel and closely spaced, not 
anastomosing, apex acute, mucro oblique. Glands 1, 
near base. Inflorescences extended axillary racemes 
or panicles or rarely on simple axillary peduncles, 
9-24 heads per raceme, axis length 33-150 mm long. 
Heads globular, pale yellow, 5-7 mm long; peduncle 
4-15 mm long, glabrous. Pods stipitate, brown, 
linear to oblong, straight, raised over seeds, 35- 
80 mm long, 11-12 mm wide, chartaceous, smooth, 
glabrous, transversely reticulately nerved, margin 
thickened slightly, acute. Seeds longitudinal in pod, 
brown, discoid, 5.5-7 mm long, 5.5-7 mm wide. 
Flowering: May - Sept; fruiting: June - Sept. Fig. 9 
An NT endemic and restricted to the DR and 
Alligator Rivers area and the Cobourg Peninsula. 
Found in open forest and woodland on lateritic soils. 
A. praetermissa Tindale 
Erect shrub, 0.5-1.2 m high. Branchlets slightly 
angular, slightly pruinose, glabrous to glabrescent. 
Stipules persistent, brown, triangular, 1 mm long, 
slightly pubescent. Pulvinus 1-2 mm long, glabrous. 
Phyllodes straight or curved, narrowly oblanceolate or 
elliptic or linear, 110-150 mm long, 3-12(18) mm 
wide, L/W 8.3-45, glabrous, primary veins 1 but with 
several secondary veins almost as prominent, 
secondary veins parallel and widely spaced, sparsely 
anastomosing, base attenuate, apex acute to obtuse, 
mucro straight or oblique, c. 1.5 mm long. Glands 1, 
near base. Inflorescences on simple axillary 
peduncles, mostly 2 per axil. Spikes yellow, 8-23 
mm long, 4-5 mm wide, loosely flowered; peduncle 
5-18 mm long, glabrous, rachis glabrous. Pods 
sessile, brown, linear to oblong, straight, slightly 
raised over seeds, opening elastically from apex, 40- 
90 mm long, 6-8 mm wide, woody, glabrous, 
obliquely reticulately nerved, margin thickened, 
asymmetric and obtuse. Seeds oblique in pod, 
olivaceous, sub-discoid, 6 mm long, 4 mm_ wide. 
Flowering: Mar - Sept; fruiting: July - Aug. Fig. 9 
A rare NT endemic on stony hills between Pine 
Creek and Hayes Creek; also in Litchfield NP. 
A. tolmerensis G.Leach 
Shrub. Branchlets flattened, glabrous. Stipules 
persistent, brown, oblong, 1 mm long, glabrous, 
ciliate. Pulvinus 4-6 mm long, glabrous. Phyllodes 
curved, dimidiate, 110-245 mm long, 50-88 mm wide, 
L/W 2.7-3, glabrous, primary veins 3-4, lower 2 
nerves confluent near base, secondary. veins oblique 
or penniveined, reticulate, base oblique, apex obtuse. 
Glands prominent, 4, scattered along dorsal margin 
and at pulvinus. Inflorescences axillary racemes or 
panicles or terminal panicles, 6-8 heads per raceme, 
axis length 55-80 mm long. Heads globular, yellow, 
7-12 mm wide; peduncle 9-20 mm long, glabrous. 
Pods stipitate, greyish to brown, linear to oblong, 
straight, flat, 55-110 mm long, 20-30 mm wide, 
coriaceous, glabrous, transversely reticulately nerved, 
margin with obscure wing to 1 mm wide, apiculate. 
‘Seeds transverse in pod, brown, flattened ellipsoid, 8- 
10 mm long, 7-7.5 mm wide. Flowering: Nov - Feb; 
fruiting: May. Fig. 10 
