Full Terms & Conditions of access and use can be found at https://www.tandfonline.com/action/journalInformation?journalCode=sgra20 Grana ISSN: 0017-3134 (Print) 1651-2049 (Online) Journal homepage: https://www.tandfonline.com/loi/sgra20 The systematic value of pollen morphology in Operculina (Convolvulaceae) Ana Rita G. Simões, Carol A. Furness & Cynthia F. P. Da Luz To cite this article: Ana Rita G. Simões, Carol A. Furness & Cynthia F. P. Da Luz (2019) The systematic value of pollen morphology in Operculina (Convolvulaceae), Grana, 58:1, 1-13, DOI: 10.1080/00173134.2018.1511750 To link to this article: https://doi.org/10.1080/00173134.2018.1511750 Published online: 22 Oct 2018. Submit your article to this journal Article views: 56 View Crossmark data