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Acacieae
Acacieae is a wide-ranging, polyphyletic tribe of legumes in the Mimosoideae, that is native to the tropics, subtropics and warm-temperate regions. It includes five or six genera and some 1,450 species.
==Relationships==
In Bentham's 1842 circumscription of the subfamily Mimosoideae, Acacieae was one of its three constituent tribes, the others being Ingeae Benth. & Hook.f. and Mimoseae Bornn. His Acacieae tribe of 1842 included many genera that were subsequently assigned to tribe Ingeae Benth. In 1875 however, Bentham narrowed his definition of Acacieae so as to include only ''Acacia'' Mill.
The only morphological character of Acacieae used to distinguish it from the Ingeae, is the presence of free stamens (as in tribe Mimoseae).〔 In the Ingeae they are fused in the form of a tube, whereas in the Acacieae only a few species have the stamens fused at the base. Several characters of the foliage, seeds, seed pods, pollen and stipules are shared by the two tribes.〔 The flower morphology of ''Acacia s.l.'' has characteristics in common with the genera ''Leucaena'', ''Piptadenia'' and ''Mimosa'' (tribe Mimoseae) and ''Enterolobium'' and ''Lysiloma'' (tribe Ingeae).
The tribal position of monotypic genus ''Faidherbia'' A. Chevalier is equivocal.〔 It was included in the Acacieae by Vassal (1981) and Maslin et al. (2003), but Lewis & Rico Arce placed it in tribe Ingeae following Polhill (1994) and Luckow et al. (2003).〔〔(【引用サイトリンク】url=http://taxonomicon.taxonomy.nl/TaxonTree.aspx?id=100685 )〕 In the latter case tribe Acacieae may conform to genus ''Acacia s.l.'', pending the latter's relationship to other mimosoid genera. ''Faidherbia'' is troublesome as its stamens are shortly united at their base and its pollen is similar to some taxa in the Ingeae.〔
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