About Senna aciphylla (Benth. ex A.Gray) Randell
Senna aciphylla is an erect or sprawling shrub that usually grows up to 3 meters (9.8 feet) tall. Its leaves are pinnate, measuring 30–50 millimeters (1.2–2.0 inches) long, borne on a petiole that is typically 2–5 millimeters (0.079–0.197 inches) long. Each leaf holds four to eight pairs of linear or narrowly elliptic leaflets, which are 20–25 millimeters (0.79–0.98 inches) long and 1–4 millimeters (0.039–0.157 inches) wide. Leaflet edges are usually rolled under, each leaflet ends in an almost sharp point, and a stalked gland sits between every pair of leaflets. The flowers are yellow, arranged in pairs or groups of three in upper leaf axils, on a 20–50 millimeter (0.79–1.97 inch) long peduncle, with each flower borne on a 10–15 millimeter (0.39–0.59 inch) long pedicel. The petals are 10–15 millimeters (0.39–0.59 inches) long, and there are ten fertile stamens, with the longest anthers measuring 4–5 millimeters (0.16–0.20 inches) long. Flowering takes place in spring and summer, and the fruit is a linear pod 60–80 millimeters (2.4–3.1 inches) long. This species grows in forest and on rocky slopes in woodland. It occurs in south-eastern Queensland, the coast, ranges and western slopes of New South Wales, the Australian Capital Territory, and eastern Victoria.
