Banca de DEFESA: ANTONIO CARLITO BEZERRA DOS SANTOS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : ANTONIO CARLITO BEZERRA DOS SANTOS
DATE: 25/03/2024
TIME: 08:30
LOCAL: meet.google.com/dex-psjx-pjr
TITLE:

TAXONOMIC NEWS IN Bauhinia ser. Cansenia (CERCIDOIDEAE, LEGUMINOSAE) IN NORTHEAST BRAZIL

KEY WORDS:

Cercidoideae, New Species, Cerrado, Bahia, Taxonomy.

PAGES: 244
BIG AREA: Ciências Biológicas
AREA: Botânica
SUMMARY:

The diversity of ecosystems associated with the Brazilian Northeast territory has led to the
establishment of numerous plant species. Among the various existing species, those
belonging to the genus Bauhinia L. are still little studied in this region and their taxonomic
classification becomes difficult because they are based, in most cases, on few morphological
characters. From this perspective, the objective was to carry out a detailed taxonomic study,
seeking taxonomic novelties of the genus Bauhinia with emphasis on the Section Pauletia
Series Cansenia, as well as to better characterize morphologically the species of this genus
occurring in the Northeast. On that occasion, field expeditions were carried out to collect
botanical material and observe the species in their habitat. In addition, around 5000
specimens deposited in Brazilian and foreign herbaria, including standard collections, were
analyzed. Geographic distribution maps were prepared in SimpleMappr, using coordinates
obtained from herbarium specimens. Species conservation status was assessed using IUCN
criteria, with extent of occurrence (EOO) and area of occupancy (AOO) calculated using
GeoCAT. 20 species and two varieties of Bauhinia ser. Cansenia were recorded, occurring
in the Northeast, where the State of Bahia and the Cerrado domain presented the largest
number of species. Bauhinia cheilantha and B. subclavata are widely distributed in the
Northeast States, while five species are restricted to the State of Bahia and four occur only
in the State of Maranhão. Most species are endemic to Brazil, with six species exclusive to
the Northeast and five taxa considered threatened with extinction. In relation to taxonomic
novelties, three species were recently described of Bauhinia ser. Cansenia were described
for northeastern Brazil, namely: Bauhinia arleneae, B. andrade-limae and B. orbiculata.
Bauhinia arleneae occurs in the central-eastern region of the state of Bahia in humid tropical
forests and has entire, elliptical leaves with an acuminate apex and an obtuse base, glabrous
surfaces with three to five primary veins, paired flowers along the pseudoracemes and fruit
with reticulate valves leathery-woody. Bauhinia andrade-limae is restricted to the states of
Alagoas and Pernambuco, occurring in the Atlantic Forest and has bilobed, broadly ovate
leaves with an obtuse apex and a chordate base, cartaceous and glabrous, generally with nine
main veins, lenticelate stems, floral buds of up to 5.3 cm long at anthesis and legume with
woody, glabrous and reticulate valves. Bauhinia orbiculata is restricted to the northern part
of Chapada Diamantina, in the central area of the state of Bahia and occurs in seasonally dry
'carrasco' shrub vegetation, being characterized by entire leaves with nine primary veins,
rounded to obtuse apex and chordate base, abaxial face of the ferruginous leaf blade and
linear and smooth floral buds. We provide here descriptions, identification keys, illustrations,
distribution maps and taxonomic comments for all species.

COMMITTEE MEMBERS:
Externo à Instituição - LEONARDO PESSOA FELIX - UFPB
Externa à Instituição - MARIA IRACEMA BEZERRA LOIOLA - UFC
Externo à Instituição - RAIMUNDO LUCIANO SOARES NETO - UFRN
Presidente - REGINALDO DE CARVALHO
Externo à Instituição - THALES SILVA COUTINHO - UFMT