Archidendron is a genus of flowering plants in the subfamily Mimosoideae (the mimosa subfamily) of the family Fabaceae (legumes), order Fabales. It was described by the botanist Ferdinand von Mueller (F.Muell.) and currently comprises around 98 accepted species, with further taxa yet to be formally described.
Members of the genus are shrubs or small to medium-sized trees reaching up to 30 metres in height. They produce bipinnate leaves with leaflets typically arranged in opposite pairs, and bear extrafloral nectaries — structures outside the flowers that secrete nectar and often attract ants. The genus is notably unarmed, lacking spines or thorns.
Archidendron is morphologically diverse. Inflorescences can arise from leaf axils (axillary), branch tips (terminal), older branches (ramiflorous), or the main trunk (cauliflorous), and may take the form of a rounded head or capitulum, an umbel, a raceme, or a panicle. Individual flowers are bell-shaped or tubular, with a 5-lobed calyx and corolla tube, numerous stamens, and one to several carpels. The fruit is a legume pod that varies from flat to cylindrical to twisted or contorted.
The genus ranges widely across tropical and subtropical Asia and Australasia, from India through Indochina, southern China, Taiwan, and the Malay Archipelago (Malesia) across Papuasia to Queensland and New South Wales in Australia.
Taxonomy Notes
Archidendron was described by the German-Australian botanist Ferdinand von Mueller (F.Muell.) and is placed in the subfamily Mimosoideae of the family Fabaceae. Plants of the World Online accepted 98 species as of December 2024, with approximately 20 further species awaiting formal description.
Distribution
The genus ranges from India through Indochina, southern China, and Taiwan across Malesia and Papuasia to Queensland and New South Wales in northeastern Australia. This distribution encompasses tropical and subtropical rainforest zones throughout much of the Indo-Pacific region.
