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Amicia  is the least diverse genus of the Adesmia clade. It has a disjunct distribution with six endemic species restricted to the central Andes of South America and one species endemic to Mexico. The phylogeny and taxonomy of this genus have been extensively studied. Nevertheless, pollen data are still insufficiently known within a taxonomic context. In this study, we analysed all  Amicia  species using light, scanning, and transmission electron microscopy and we present phylogenetically useful palynological information to support taxonomic studies .  Variation in pollen grain size and aperture features is used to delimit pollen types, which corroborate molecular and biogeographical data. Multivariate analysis reinforced the pollen type subdivisions and revealed novel diagnostic morphological features for two infrageneric taxa of  Amicia . Our pollen results provide informative pollen characters to assist in the delimitation of  Amicia  species, which can be easily misidentified due to similarities in vegetative structures.  Amicia  pollen morphology reflects population isolation and divergence of  Amicia  lineages and provides critical features for future phylogenetic optimisation of the Adesmia clade.

Palynology of Amicia Kunth. (Leguminosae – Papilionoideae – Dalbergieae – Informal Adesmia clade) set in a systematic and phylogenetic context