Albizia julibrissin is known by a wide variety of common names, such as Persian silk tree or pink siris. It is also called Lenkoran acacia or bastard tamarind, though it is not too closely related to either genus. Its leaves slowly close during the night and during periods of rain, the leaflets bowing downward. Albizia julibrissin is a small deciduous tree growing to 5–16 m tall, with a broad crown of level or arching branches. The bark is dark greenish grey in colour and striped vertically as it gets older, The leaves are bipinnate, 20–45 cm long and 12–25 cm broad, divided into 6–12 pairs of pinnae, each with 20–30 pairs of leaflets; the leaflets are oblong, 1–1.5 cm long and 2–4 cm broad. The flowers are produced throughout the summer in dense inflorescences, the individual flowers with small calyx and corolla (except the central ones), and a tight cluster of stamens 2–3 cm long, white or pink with a white base, looking like silky threads. They have been observed to be attractive to bees, butterflies and hummingbirds. The fruit is a flat brown pod 10–20 cm long and 2–2.5 cm broad, containing several seeds inside. A good specimen for bonsai.
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