Data from: A new generic system for the pantropical Caesalpinia group (Leguminosae)

The Caesalpinia group is a large pantropical clade of ca. 205 species in
subfamily Caesalpinioideae (Leguminosae) in which generic delimitation has
been in a state of considerable flux. Here we present new phylogenetic
analyses based on five plastid and one nuclear ribosomal marker, with
dense taxon sampling including 172 (84%) of the species and
representatives of all previously described genera in the Caesalpinia
group. These analyses show that the current classification of the
Caesalpinia group into 21 genera needs to be revised. Several genera
(Poincianella, Erythrostemon, Cenostigma and Caesalpinia sensu Lewis,
2005) are non-monophyletic and several previously unclassified Asian
species segregate into clades that merit recognition at generic rank. In
addition, the near-completeness of our taxon sampling identifies three
species that do not belong in any of the main clades and these are
recognised as new monospecific genera. A new generic classification of the
Caesalpinia group is presented including a key for the identification of
genera, full generic descriptions, illustrations (drawings and photo
plates of all genera), and (for most genera) the nomenclatural transfer of
species to their correct genus. We recognise 26 genera, with reinstatement
of two previously described genera (Biancaea Tod., Denisophytum R. Vig.),
re-delimitation and expansion of several others (Moullava, Cenostigma,
Libidibia and Erythrostemon), contraction of Caesalpinia s.s. and
description of four new ones (Gelrebia, Paubrasilia, Hererolandia and
Hultholia), and make 75 new nomenclatural combinations in this new generic
system.