Chamaecrista veadeirana ( Irwin & Barneby 1978: 150 ) Mendes & Silva, 2020

Mendes, Thainara Policarpo, Souza, Alessandro Oliveira De & Silva, Marcos José Da, 2020, Molecular phylogeny and diversification timing of the Chamaecrista sect. Absus subsect. Absus ser. Paniculatae, a newly circumscribed and predominantly endemic of the Cerrado Biome group, Phytotaxa 446 (3), pp. 159-182 : 179

13. Chamaecrista veadeirana ( Irwin & Barneby 1978: 150) Mendes & Silva stat. nov. ≡ Cassia rigidifolia var. veadeirana Irwin & Barneby (1978: 150) ≡ Chamaecrista rigidifolia var. veadeirana Irwin & Barneby (1978: 150) Irwin & Barneby (1982: 655) . Type: BRAZIL. Goiás: occasional in cerrado, Chapada dos Veadeiros 2 km from Veadeiros (now Alto Paraíso de Goiás), 18 July 64 (fl, fr), Prance & Silva 58208 (holotype: UB20516!; isotypes: K000555591!; M0217464!; MO2412545!; NY00003891!; U0003208!, US 00001683!).

Conclusions

Chamaecrista sect. Absus subsect. Absus ser. Paniculatae is here considered a monophyletic group with the inclusion of Ch. crenulata and the exclusion of Ch. lundii . It is limited to 13 taxa, originated in the Cerrado areas of central Brazil, of which 12 are endemic to Brazil and one reaches Bolivia ( Ch. rigidifolia ). These species are recognized by having dorsiventral, non-differentiated, coriaceous, divaricate leaflets, with veins usually prominent on both sides, the presence or absence of corneous-thickened margins, and terminal paniculate inflorescence with asymmetric flowers that have the adaxial petal either similar to a standard and conspicuously differentiated from the others in size and shape or sometimes similar to one of the upper lateral petals. Within the clade Paniculatae , we recognized two subclade and two lineages that are genetically and geographically structured, although most species originated in the Pliocene and their morphology is conditioned to the highland areas of central Brazil.

Finally, we emphasize that with the exception of those discussed in detail for a Paniculatae series, the phylogenetic relationships observed in this study must be viewed with care, as they are linked to subsampled infracategories of the genus (mainly subsections and series) and, therefore, whose phylogenetic circumscription will be better defined from a study with a larger sampling of its taxa.