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Notes on the genus Exostema (Rubiaceae), its limits and sectional subdivision
Author(s) -
Greuter Werner,
RankinRodríguez Rosa
Publication year - 2022
Publication title -
taxon
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 81
eISSN - 1996-8175
pISSN - 0040-0262
DOI - 10.1002/tax.12603
Subject(s) - subdivision , clade , circumscription , genus , rubiaceae , rank (graph theory) , biology , zoology , botany , geography , mathematics , combinatorics , phylogenetic tree , computer science , archaeology , artificial intelligence , biochemistry , gene
Based on recent molecular work by Paudyal & al., the generic limits of the Neotropical woody genus Exostema are reassessed with a view of making them more compatible with traditional, morphology‐based generic concepts. A wide circumscription is favoured, congruent with Paudyal & al.'s “clade B” (the Exostema‐Solenandra‐Coutarea‐Hintonia group). Thus defined, Exostema is a genus with 40 species and five natural sections and incorporates three generic splits that were proposed by Paudyal & al. To minimise nomenclatural disruption, a proposal to conserve the name Exostema Rich. against Coutarea Aubl. has been presented separately. Two new combinations at sectional rank are proposed.