Abstract
The complex of citrate rattan species that includes Calamus aruensis presents significant taxonomic challenges throughout its range. A revision of the group from New Guinea and Australia through the west Pacific to its eastern limit in Fiji is presented here. The complex is recognised by its rather broad, cucullate leaflets, by the long, robust, strictly tubular bracts on the primary inflorescence axis and by the short, funnel-shaped bracts on the first order branches. Four species are recognised here, C. aruensis, C. vitiensis and two new species, C. pachypus and C. dasyacanthus. Calamus hollrungii and C. latisectus are placed in synonymy with C. aruensis, and C. stipitatus and C. vanuatuensis with C. vitiensis.
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