20 MIMOSACEAE 
Only known from the Litchfield area. Similar to 
A. platycarpa but readily distinguished by the 
flattened/angular branchlets. 
A. torulosa Benth. 
Shrub to slender tree, 2-8 m high. Bark brown 
to grey, fissured, flaky at base. Branchlets angular, 
resinous, glabrous. Stipules persistent, reddish, 
narrow-triangular, 1 mm long, glabrous. Pulvinus 
1.5-5 mm long, glabrous. Phyllodes straight to 
curved, narrowly elliptic to linear, 85-205 mm long, 
4-12 mm wide, L/W 9-41, resinous, glabrous, 
primary veins 1, often with 2 prominent secondary 
veins, secondary veins parallel and closely spaced, 
not anastomosing, base attenuate, apex acute to 
obtuse, mucro straight or oblique. Glands 1, near 
base. Inflorescences on simple axillary peduncles 
and on short axillary shoots, 1-4 per axil, determinate 
or rarely indeterminate, 4 heads per raceme, axis 
length 10-18 mm long. Spikes deep yellow to golden, 
9-53 mm long, 3-4 mm wide, densely flowered; 
peduncle 1-8 mm long, resinous, tomentose, 
rachis sparsely tomentose. Pods stipitate, yellowish to 
pale brown, moniliform, straight, raised over 
seeds, 85-200 mm long, 5-7 mm wide, coriaceous, 
vernicose, glabrous, longitudinally wrinkled, acute. 
Seeds longitudinal in pod, black, oblong, 5-7.5 mm 
long, 3-4.7 mm wide. Flowering: May - July; 
fruiting: Aug - Nov. Fig. 10 
Widespread across the Top End and Cape York, 
extending to the sand dunes of northern part 
of Central Australia. Doubtfully recorded for the 
DR. In sandy habitats including coastal dunes. 
A. umbellata Cunn. ex Benth. 
Erect shrub or rarely a tree, 1-3(5) m high. 
Branchlets angular and ribbed, resinous, 
glabrous. Stipules persistent, reddish, narrow- 
triangular, 1 mm long, slightly resinous. Pulvinus 
4-6 mm long, glabrous. Phyllodes straight, elliptic, 50- 
130 mm long, 10-39 mm wide, L/W 2.1-6.5, 
vernicose, glabrous, primary veins | with 2-6 raised 
secondary veins, secondary veins parallel and closely 
Acacia 
spaced, not anastomosing, base attenuate and slightly 
oblique, apex acute to obtuse, mucro straight to ob- 
lique, umbonate. Glands 1, at pulvinus. Inflorescences 
on short axillary shoots, indeterminate, 2-4 heads per 
raceme, axis length 4-15 mm long. Spikes deep 
yellow to golden, 11-37 mm long, 4-5 mm wide, 
densely flowered; peduncle 2-9 mm long, resinous, 
glabrous, rachis resinous, glabrous. Pods sessile, 
brown, linear to oblong, curved, cylindrical, 20-70 
mm long, 2.5-5 mm wide, stiffly coriaceous, resinous, 
glabrous, longitudinally wrinkled with pale, smooth 
margin, acute. Seeds longitudinal in pod, black, 
oblong, 3.5-5 mm long, 2-2.5 mm _ wide. 
Flowering: Jan - June; fruiting: June - Oct. Fig. 10 
In the Top End, Gulf and Qld. Known in the DR 
north of Pine Creek. Often along seasonal creek lines 
in skeletal soils. 
A. ‘Douglas R.’ 
Tree, 3-7 m high. Bark grey, corky. Branchlets 
terete, sparsely hairy, hairs erect, hyaline. Stipules 
persistent, reddish, spinose, 1-5.5 mm long, glabrous. 
Leaves bipinnate. Pulvinus 2-4.5 mm long, hairy 
above. Leaf rachis 60-100 mm long, 12-28 pairs of 
pinnae per leaf, hairy above, jugary and interjugary 
glands absent. Leaf pinnae 12-28 mm long, 17-44 
pairs of leaflets per pinna; /eaflets linear-oblong, flat, 
1.7-2 mm long, 0.7-0.9 mm wide, L/W 2-3, 
concolorous, glabrous to glabrescent. /nflorescences 
on simple axillary peduncles. Heads globular, white 
to cream, 10 mm wide; peduncle 26-35 mm long, 
hairy in part above involucel. Pods stipitate, greyish 
to brown, linear to oblong, straight, flat, 40-65 mm 
long, 10-15 mm wide, stiffly coriaceous, hairy, nerves 
obscure, acute. Seeds longitudinal in pod, brown, 
oblong, 12 mm long, 9 mm wide. Flowering: Oct; 
fruiting: June - Aug. Fig. 4 
The taxon described here is known only from 
the Douglas/Daly R. area and found on cracking 
clay soils. A. ditricha Pedley is described from 
Qld and is similar to the taxon described here. 
Further work is needed to determine if these taxa are 
conspecific. 
ADENANTHERA L. 
A genus of about 8 species in tropical Asia and the Pacific; 2 species in Australia and only 1 species in the NT. 
A. pavonina L. 
Tree 8-20 m high. Bark smooth. Pulvinus not 
evident. Leaf rachis glabrescent, 160-265 mm long, 
with 2-5 pairs of pinnae, often subopposite. Glands 
absent; pinnae 50-190 mm long with 12-16 alternate 
