The Rudgea hostmanniana complex (Rubiaceae) in the Guiana Shield region
Cytotaxonomy of the endemic Karst and Danxia ferns in Adiantum (Pteridaceae)
Pseudorobillarda sichuanensis sp. nov. associated with Bambusa sp. from Sichuan province, China
Systematic significance of pollen morphology in rare endemic taxa of Astragalus L. (Fabaceae)
Taxonomic revision of Eunotia luna var. aequalis f. paucistriata Frenguelli and E. luna var. aequalis f. major Frenguelli: analysis of type material, lectotypification and current taxonomic status