IBONE   05434
INSTITUTO DE BOTANICA DEL NORDESTE
Unidad Ejecutora - UE
artículos
Título:
Synopsis of Hexasepalum (Rubiaceae), the Priority Name for Diodella and a New Species from Brazil
Autor/es:
A. CABAÑA FADER; CABRAL E.L.; STEVEN DESSEIN; R.M. SALAS
Revista:
SYSTEMATIC BOTANY
Editorial:
AMER SOC PLANT TAXONOMISTS
Referencias:
Lugar: Laramie; Año: 2016 vol. 41 p. 408 - 422
ISSN:
0363-6445
Resumen:
Abstract?Hexasepalum is the priority name for Diodella. In the present paper, we provide a synopsis of Hexasepalum. The genus differsfrom the remaining genera of the tribe Spermacoceae by the combination of infundibuliform flowers, 2-lobed stigmas, schizocarpic fruits,ventral face of the mericarps with two depressions, seeds with T or Y shaped ventral grooves, and pollen grains with two types of supratectalelements. We propose two combinations, i.e. Hexasepalum domingense and H. vaginale, and the formal synonymization of H. angustifolium(including Diodella crassifolia). We also propose two new synonyms: Diodia rosmarinifolia [= Diodella rosmarinifolia] is placed in the synonymy ofH. apiculatum, and Diodia incana is now considered a synonym of H. teres. We choose lectotypes for H. vaginale, and for two synonyms ofH. apiculatum. In addition, we describe and illustrate a new species endemic from Bahia, Brazil, H. zappiae sp. nov. Detailed descriptions areprovided only for the species imperfectly known; otherwise comprehensive taxonomic descriptions are mentioned for each species. Thedescriptions of the Hexasepalum species are complemented with a key, geographical distributions, and illustrations of key morphologicalcharacters. Line drawings are provided for species not illustrated before in literature.Keywords?Diodia, Neotropics, Spermacoceae, taxonomy.