Shrubs or small trees, erect, to 15 m. Twigs dark reddish brown to nearly black, slightly flexuous, ridged, usually gla­brous. Leaves compound, 70–150 mm; petiole 7–33 mm, glabrous, gland present, below proximalmost pinna pair, 1–2 mm diam., glabrous; rachis glands between most pinna pairs; pinnae 3–13, 35–80 mm, 7–20 mm between pinna pairs; leaflets 15–45 pairs per pinna, blades linear, 5–15 × 0.3–0.6 mm, base cuneate, apex obtuse to acute, not apiculate, surfaces glabrous. Peduncles 2–4 mm. Inflorescences globose heads, densely flowered, 5–8 mm diam., in axillary pseudoracemes of 10–30 heads or terminal pseudo­panicles of 1–15 pseudoracemes. Flowers 5-merous, bright yellow; calyx 0.6–1.2 mm; corolla 1.4–2 mm; filaments 2.5–3.5 mm; ovary glabrous. Legumes flat­tened, linear, 20–105 × 4–8 mm, slightly constricted between seeds. Seeds: aril light yellow, obovate, 2–3 mm, forming cap on seed. 2n = 26.

Phenology: Flowering year-round.
Habitat: Disturbed areas.
Elevation: 500–600 m.

Distribution

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

Discussion

Acacia decurrens is known from Mendocino, San Diego, Solano, and Ventura counties, and one possible record in Humboldt County.

Selected References

None.

Lower Taxa

None.