Taxonomic revision of the salwoods: Acacia aulacocarpa Cunn. ex Benth. andits allies (Leguminosae : Mimosoideae : section Juliflorae)

A taxonomic revision of Acacia aulacocarpa Cunn. ex Benth. and its seven cl ose relatives is presented. These species comprise the A. aulacocarpa group in the Acacia Mill. section Juliflorae and occur naturally in eastern and northern Australia, New Guinea and Wetar, eastern Indonesia. In the past, t he name A. aulacocarpa has been widely misapplied. This species is relative ly uncommon but has an extensive geographic range extending from the Athert on Tableland region in Queensland, south to northern New South Wales. Acaci a aulacocarpa var. fruticosa C.T.White is considered conspecific with A. au lacocarpa. The name A. lamprocarpa O.Schwarz is reinstated for a northern A ustralian taxon that extends from western Queensland through Northern Terri tory to the Kimberley region of Western Australia. Five new taxa are descri bed from A. aulacocarpa sens. lat., namely A. celsa Tindale (Queensland), A . disparrima subsp. disparrima M.W.McDonald & Maslin (northern New South Wa les and Queensland), A. disparrima subsp. calidestris M.W.McDonald & Maslin (Queensland), A. midgleyi M.W.McDonald & Maslin (Queensland) and A. peregr ina M.W.McDonald & Maslin (New Guinea). A full description is provided for A. crassicarpa Cunn. ex Benth. Mainly on the basis of their mode of pod deh iscence, two subgroups within the A. aulacocarpa group are defined: A. aula cocarpa, A. celsa and A. disparrima comprise the A. aulacocarpa subgroup an d have pods that dehisce along the dorsal suture; and A. crassicarpa, A. la mprocarpa, A. midgleyi, A. peregrina and A. wetarensis comprise the A. cras sicarpa subgroup and have pods that dehisce along the ventral suture. All s pecies in the group, including the Indonesian species A. wetarensis, are il lustrated and a key to the taxa is provided. Acacia celsa, A. crassicarpa, A. peregrina and A. midgleyi have considerable potential for wood productio n in tropical plantation forestry.