Gaudichaud's senna

Senna gaudichaudii is a shrub or tree that typically grows to a height of 2–3 m (6 ft 7 in – 9 ft 10 in), sometimes a tree-top vine. Its new growth is sometimes covered with soft, golden-yellow hairs. The leaves are pinnate, 50–100 mm (2.0–3.9 in) long on a petiole 10–30 mm (0.39–1.18 in) long, usually with three to five pairs of oblong to egg-shaped leaflets, the narrower end towards the base. The leaflets are mostly 20–50 mm (0.79–1.97 in) long and 7–15 mm (0.28–0.59 in) wide, usually spaced 6–10 mm (0.24–0.39 in) apart. There are up to three stalked glands between the lowest pairs of leaflets. The flowers are yellow and arranged in upper leaf axils in groups of four to ten on a peduncle 30–50 mm (1.2–2.0 in) long, each flower on a pedicel 20–30 mm (0.79–1.18 in) long. The petals are 10–15 mm (0.39–0.59 in) long and there are ten fertile stamens, the anthers about 5–7 mm (0.20–0.28 in) long. Flowering occurs from February to October in Australia, and the fruit is a flat pod 100–150 mm (3.9–5.9 in) long, about 10 mm (0.39 in) wide and slightly curved.

Senna gaudichaudii occurs in Fiji, Hawaii, Java, the Lesser Sunda Islands, the Maluku Islands, New Caledonia, Pitcairn Island, Queensland, the Society Islands, Tubuai and Vanuatu. In Hawaii, this species inhabits dry, sheltered locations on rocky slopes, and disturbed sites. It is found on all Hawaiian islands apart from Niihau and Kahoʻolawe, and from almost sea level to 3,000 ft (910 m). In Australia, the species grows in forest and drier places in rainforest in coastal and subcoastal eastern Queensland and Cape York Peninsula.

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