Trees, erect, to 30 m, usually spreading by root suckers. Twigs reddish brown, not flexu­ous, slightly ridged, glabrous. Leaves phyllodic, juvenile com­pound leaves often persisting on young plants; phyllode flat, straight to slightly falcate, usu­ally narrowly elliptic, rarely oblanceolate, 40–140 × 6–25 mm, venation parallel, with 3–5 prominent veins, minor veins prominently reticulate, apex narrowly obtuse to acute, apiculate, surfaces glabrous; gland 0 (or 1), 0–5 mm distal to pulvinus when present; pulvinus 2–5 mm. Peduncles 4–11 mm. Inflorescences globose heads, densely flowered, 6–9 mm diam., in solitary pseudoracemes of 2–8 heads in leaf axils. Flowers 5-merous, pale yellow; calyx 0.9–1.3 mm; corolla 1.5–2 mm; filaments 2.5–3.5 mm; ovary pubescent. Legumes elliptic in cross section, linear, 50–150 × 4–8 mm, not constricted between seeds. Seeds: aril yellow to pink to deep red, encircling seed in irregular double fold. 2n = 26.

Phenology: Flowering fall, spring.
Habitat: Disturbed areas.
Elevation: 30–300 m.

Distribution

• Generated Map
• Legacy Map

Introduced; Calif., se, e Australia, introduced also in s South America.

Discussion

Acacia melanoxylon is known from Alameda, Contra Costa, Los Angeles, Marin, Mendocino, Monterey, San Diego, San Francisco, San Luis Obispo, Santa Barbara, Santa Cruz, and Ventura counties.

Selected References

None.

Lower Taxa

None.