Cupaniopsis flagelliformis, commonly known as brown tuckeroo or weeping flower tamarind,[2] is a tree in the lychee and maple family Sapindaceae, endemic to eastern Australia.

[5][6][7][8] Small flowers are carried on a pendant spike up to 55 cm (22 in) long, produced either terminally or in the leaf axils.

[8] This species was first described by the Australian botanist Frederick Manson Bailey, who published a description in the Queensland Department of Agriculture's Botany Bulletin in 1893.

[9] In a 1924 revision of the family Sapindaceae, the Bavarian botanist Ludwig Adolph Timotheus Radlkofer transferred the species from Cupania (a South American genus) to Cupaniopsis.

The species epithet flagelliformis is a combination of the Latin words flagellum ('whip'), and fōrma ('shape'), which is a reference to the whip-like appearance of the inflorescence.

[5][8] The brown tuckeroo inhabits tropical and sub-tropical rainforest and monsoon forest, where it grows as an understorey tree.

[17] This species is listed by both the International Union for Conservation of Nature (IUCN) and the Queensland Department of Environment and Science as least concern.