Psittacanthus (Loranthaceae) in Brazil: new occurrences, lectotypifications, new synonyms and an illustrated key.

We present results related to the taxonomic revision of Psittacanthus (Loranthaceae) for "Flora do Brasil 2020". Three new records were found: Psittacanthus kempffii to Rondônia, P. lasianthus to Roraima, and P. truncatus to Mato Grosso. Twelve new synonyms are proposed here: P. carnosus, P. crassipes and P. pustullosus (synonyms for P. acinarius), P. duckei (for P. biternatus), P. baguensis (for P. crassifolius, P. salvadorensis (for P. excrenulatus), P. bergii (for P. grandifolius, P. brachypodus, P. leptanthus and P. redactus (for P. lamprophyllus), P. acevedoi and P. rugostylus (for P. plagiophyllus). Three lectotypes are designated: for P. lasianthus, P. rugostylus and P. biternatus, which makes the neotype previously designated for P. biternatus superfluous. The type-specimen of P. formosus (synonym of P. robustus) was recently found. We propose an identification key for the 33 Brazilian species, with illustrations of the main characters used. [ABSTRACT FROM AUTHOR]