Tree to 10 m high. Ultimate parts of branchlets angular, glabrous, strongly lenticellate. Stipules corky, broadly triangular, acute, c. 1 mm. Phyllodes linear-lanceolate, ± parallel-sided, straight to slightly curved, acute, usually with a hooked acumen, 6.5-10 by 0.5-0.9 cm, (7-)10-14 times as long as wide, glabrous; pulvinus up to 2.5 mm, with a gland subbasal to 0.5 cm above the base, narrowly elliptic, slit-like, c. 1 mm; prominent longitudinal veins 5 or more, and several prominulous additional ones, anastomoses scarcely visible but numerous. Glomerules c. 7 mm in diameter, solitary or in groups of two, two groups in each axil, on glabrous peduncles, 0.7-1.3 cm. Flowers golden to bright yellow, pentamerous. Calyx with membranous lobes, sometimes expanded gradually from the base, but often with a narrow stipe and a broad lamina, 1-1.3 mm, with a few hairs at the top. Corolla 1.5-1.9 mm, usually connate ± to the middle, glabrous. Stamens c. 3.5 mm. Ovary sessile, glabrous. Pod brown, linear, flat, with almost winged margins, membranous, raised over the seeds, transversely veined, 4-9 by 0.7-1 cm. Seeds longitudinal, broadly elliptic, 5-6 by 3.5-5 mm, areole large, closed; funicle scarcely thickened, not folded.
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Trees, evergreen, 6-15 m tall, glabrous. Branches gray or brown, unarmed; branchlets slender, angular. Phyllodes straight or slightly falcate, linear-lanceolate, 6-10 × 0.5-1.3 cm, leathery, both surfaces glabrous, conspicuous longitudinal veins (3-)5(-8), both ends acuminate, apex slightly obtuse, usually with hooked acumen. Heads solitary or 2-or 3-fasiculate, axillary, globose, ca. 0.7 cm in diam.; peduncles 7-13 mm, slender. Flowers golden yellow, fragrant. Calyx 1-1.3 mm. Petals greenish, 1.5-1.9 mm. Stamens numerous, ca. 3.5 mm. Ovary yellow-brown villous; style ca. 4 mm. Legume black-brown, flat, 4-9(-12) × 0.7-1 cm. Seeds broadly elliptic, 5-6 × 3.5-5 mm. Fl. Mar-Oct, fr. Aug-Dec. 2n = 26*.
An evergreen tree. It grows 17 m high and spreads 4 m wide. The trunk is erect and the branches are spreading. The leaves (phyllodes) are bright green and narrow. The flowers are yellow. The are in balls and occur singly in the axils of leaves. The pods are green and inflated. They are 7.5 cm long.
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