Olacaceae and Schoepfiaceae in eastern Northeast Brazil

Abstract

This study provides descriptions, identification key and illustrations of diagnostic characters, as well as comments on the distribution and habitat of species of Olacaceae and Schoepficeae occurring in the eastern portion of northeastern Brazil, this area includes the states of Alagoas, Ceará, Paraíba, Pernambuco and Rio Grande do Norte. The morphological descriptions are based on samples collected during field expeditions (2017-2019) and analysis of herbarium specimens. Were recorded five species in four genera belonging to the family Olacaceae (Cathedra rubricaulis, Dulacia gardneriana, Heisteria ovata, H. perianthomega and Ximenia americana) and one of Schoepfiaceae (Schoepfia brasiliensis), these species occur mainly in Atlantic Forest domain (Lowland and Montane Forests) are also registered in Caatinga and Cerrado domains. The distribution of D. gardneriana and H. perianthomega was expanded, to the states of Rio Grande do Norte and Paraíba, respectively. The main vegetative characters useful for specific delimitation are presence/absence of armed branches, petiole dorso-ventrally flattened or cylindrical and nerves impressed or flat on the adaxial surface. The presence/absence of staminodes, of a pubescent ovary and hypogynous disc, as well as floral pedicel size and diameter of accrescent calyx in fruits, are the most important reproductive characters for species determination.

O Grado Apocynoid (Apocynaceae) no Nordeste Oriental do Brasil

“…A área de estudo compreende o Nordeste Oriental brasileiro, que abrange os Estados do Ceará, Rio Grande do Norte, Paraíba, Pernambuco e Alagoas, e cobre uma área total de mais de 384.000 km 2 (IBGE 2012), onde diversos grupos vegetais têm sido foco de tratamentos taxonômicos (Gomes-Silva & Alves 2020, Lucena et al 2021, Melo & Alves 2021. Esses Estados estão incluídos especialmente nos domínios fitogeográficos da Caatinga e da Mata Atlântica (IBGE 2012, Veloso et al 1991, entretanto, Moro et al (2015) citaram também a ocorrência de Cerrado em algumas áreas do Ceará.…”