Pollen morphology of Rubiaceae Juss. species occurring in an area of caatinga (dryland) vegetation in Bahia State, Brazil

The palynology of the following 16 species of Rubiaceae, from Brejinho das Amestistas, was investigated: Coccocypselum hirsutum Bartl. ex DC., Cordiera rigida Kuntze, Coutarea hexandra K.Schum., Declieuxia fruticosa Kuntze, Diodella apiculata (Willd. ex Roem. & Schult.) Delprete, D. radula (Willd. ex Roem. & Schult.) Delprete, D. teres Small., Emmeorhiza umbellata K.Schum., Leptoscela ruellioides Hook. f., Mitracarpus baturitensis Sucre., Mitracarpus villosus Cham. & Schltdl., Palicourea rigida Kunth, Psyllocarpus asparagoides Mart., Richardia grandiflora Steud., Staelia aurea K. Schum., and Staelia galioides DC. The pollen grains were acetolysed to and their morphological characters were analyzed using light and scanning electron microscopy. They varied in size from small to large; were suboblate to subprolate; inaperturate (P. rigida), colpate and colporate in the remaining species, with an aperture number that varied from three to several. The exines were microreticulate in most species, reticulate (C. hirsutum, C. rigida and P. rigida), bireticulate (D. fruticosa), microechinate-perforated (C. hexandra), echinate-granulate (R. grandiflora), echinate-granulate-perforate (D. apiculata and D. teres), and psilate (P. asparagoides). Based on the results, palynological data can be used to distinguish these species

A família Rubiaceae na Reserva Biológica Guaribas, Paraíba, Brasil: subfamília Rubioideae The family Rubiaceae in the Guaribas Biological Reserve, Paraíba State, Brazil: subfamily Rubioideae

Este trabalho consiste no levantamento dos representantes de Rubiaceae subfamília Rubioideae na Reserva Biológica Guaribas, Estado da Paraíba, Brasil. Foram realizadas coletas intensivas no período de outubro/2000 a outubro/2001, as quais resultaram em 17 espécies e nove gêneros de Rubioideae. Os gêneros com maior número de espécies foram Psychotria L. (seis) e BorreriaG. Mey. (quatro). Coccocypselum P. Browne, Declieuxia Kunth, Diodia L., Mitracarpus Zucc. ex Roem. & Schult., PalicoureaAubl., RichardiaL. e Staelia Cham. & Schltdl. apresentaram uma única espécie cada. Perama hirsuta Aubl., de posição taxonômica incerta na família, também foi tratada neste trabalho. São apresentados chave, descrições, comentários e ilustrações dos táxons.<br>This paper describes the results of a survey of the Rubiaceae subfamily Rubioideae in the Guaribas Biological Reserve, State of Paraíba, Brazil. Intensive collections were made from October/2000 to October/2001, revealing 17 species and nine genera of Rubioideae. The most diverse genera were Psychotria L. (six species) and Borreria G. Mey. (four species). Coccocypselum P. Browne, Declieuxia Kunth, Diodia L., Mitracarpus Zucc. ex Roem. & Schult., Palicourea Aubl., Richardia L. and Staelia Cham. & Schltdl. were each represented by a single species. Perama hirsuta Aubl., of uncertain position within the family, is also treated in this paper. A key, descriptions, notes, and illustrations of the taxa are provided