1. Pollination-system diversity in Epipactis (Orchidaceae): new insights from studies of E. flava in Thailand

   • Henrik Æ. Pedersen
   • Kanok-orn Srimuang
   • Santi Watthana

   Original Article 23 May 2018 Pages: 895 - 909

   

2. Comparative studies on petals structure, micromorphology and ultrastructure in two species of Stephania (Menispermaceae)

   • Qiao-juan Wang
   • Xiao-ling Yan
   • Yi Ren

   Original Article 30 May 2018 Pages: 911 - 921

   

3. The floral organogenesis of Koelreuteria bipinnata and its variety K. bipinnata var. integrifolia (Sapindaceae): evidence of floral constraints on the evolution of monosymmetry

   • Limin Cao
   • Jianhui Liu
   • Louis P. Ronse De Craene

   Original Article 01 June 2018 Pages: 923 - 935

   

4. Jochen Heinrichs: March 14, 1969–April 22, 2018

   • Michael Krings
   • Harald Schneider
   • Alexander R. Schmidt

   Obituary 02 June 2018 Pages: 937 - 941

   

5. Pollen flow and pollinator sharing among synchronopatric species of Psychotria (Rubiaceae)

   • José N. Mesquita-Neto
   • João P. R. Borges
   • Edivani V. Franceschinelli

   Original Article 23 June 2018 Pages: 943 - 953

   

6. Genome sizes and phylogenetic relationships suggest recent divergence of closely related species of the Limonium vulgare complex (Plumbaginaceae)

   • Ana S. Róis
   • Sílvia Castro
   • Ana D. Caperta

   Original Article 27 June 2018 Pages: 955 - 967

   

7. Taxonomic implications of the morphological and genetic variation of cultivated and domesticated populations of the Agave angustifolia complex (Agavoideae, Asparagaceae) in Oaxaca, Mexico

   • Miguel Rivera-Lugo
   • Abisaí García-Mendoza
   • Katia Gil-Vega

   Original Article 29 June 2018 Pages: 969 - 979

   

8. Pollen morphology in Brazilian species of Gloxiniinae (Gesneriaceae): variation in apertures and pattern of ornamentation

   • Cintia N. de Souza
   • Andréa O. de Araujo
   • Eduardo C. Gasparino

   Original Article 30 June 2018 Pages: 981 - 993

   

9. Evolutionary and expression analysis of Vitis vinifera OFP gene family

   • Li Wang
   • Songlin Zhang
   • Junyang Song

   Original Article 02 July 2018 Pages: 995 - 1008

   

10. Inferring the potential of plastid DNA-based identification of derived ferns: a case study on the Asplenium trichomanes aggregate in Europe

    • Hong-Mei Liu
    • Stephen R. Russell
    • Harald Schneider

    Original Article 09 July 2018 Pages: 1009 - 1022

    

11. Phylogenetic and morphological analysis of a new cliff-dwelling species reveals a remnant ancestral diversity and evolutionary parallelism in Sonchus (Asteraceae)

    • José A. Mejías
    • Mathieu Chambouleyron
    • Jean-François Léger

    Original Article 19 July 2018 Pages: 1023 - 1040

    

12. Comparative leaf micromorphology and anatomy of the dragon tree group of Dracaena (Asparagaceae) and their taxonomic implications

    • Małgorzata Klimko
    • Renata Nowińska
    • Justyna Wiland-Szymańska

    Original Article Open access 23 July 2018 Pages: 1041 - 1055

    

13. Structure and ultrastructure of floral nectaries of two Opuntia species (Cactaceae) in relation to their floral visitors

    • Juan I. Agüero
    • Beatriz G. Galati
    • Juan P. Torretta

    Original Article 24 July 2018 Pages: 1057 - 1067