Pollination-system diversity in Epipactis (Orchidaceae): new insights from studies of E. flava in Thailand Henrik Æ. PedersenKanok-orn SrimuangSanti Watthana Original Article 23 May 2018 Pages: 895 - 909
Comparative studies on petals structure, micromorphology and ultrastructure in two species of Stephania (Menispermaceae) Qiao-juan WangXiao-ling YanYi Ren Original Article 30 May 2018 Pages: 911 - 921
The floral organogenesis of Koelreuteria bipinnata and its variety K. bipinnata var. integrifolia (Sapindaceae): evidence of floral constraints on the evolution of monosymmetry Limin CaoJianhui LiuLouis P. Ronse De Craene Original Article 01 June 2018 Pages: 923 - 935
Jochen Heinrichs: March 14, 1969–April 22, 2018 Michael KringsHarald SchneiderAlexander R. Schmidt Obituary 02 June 2018 Pages: 937 - 941
Pollen flow and pollinator sharing among synchronopatric species of Psychotria (Rubiaceae) José N. Mesquita-NetoJoão P. R. BorgesEdivani V. Franceschinelli Original Article 23 June 2018 Pages: 943 - 953
Genome sizes and phylogenetic relationships suggest recent divergence of closely related species of the Limonium vulgare complex (Plumbaginaceae) Ana S. RóisSílvia CastroAna D. Caperta Original Article 27 June 2018 Pages: 955 - 967
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-LugoAbisaí García-MendozaKatia Gil-Vega Original Article 29 June 2018 Pages: 969 - 979
Pollen morphology in Brazilian species of Gloxiniinae (Gesneriaceae): variation in apertures and pattern of ornamentation Cintia N. de SouzaAndréa O. de AraujoEduardo C. Gasparino Original Article 30 June 2018 Pages: 981 - 993
Evolutionary and expression analysis of Vitis vinifera OFP gene family Li WangSonglin ZhangJunyang Song Original Article 02 July 2018 Pages: 995 - 1008
Inferring the potential of plastid DNA-based identification of derived ferns: a case study on the Asplenium trichomanes aggregate in Europe Hong-Mei LiuStephen R. RussellHarald Schneider Original Article 09 July 2018 Pages: 1009 - 1022
Phylogenetic and morphological analysis of a new cliff-dwelling species reveals a remnant ancestral diversity and evolutionary parallelism in Sonchus (Asteraceae) José A. MejíasMathieu ChambouleyronJean-François Léger Original Article 19 July 2018 Pages: 1023 - 1040
Comparative leaf micromorphology and anatomy of the dragon tree group of Dracaena (Asparagaceae) and their taxonomic implications Małgorzata KlimkoRenata NowińskaJustyna Wiland-Szymańska Original Article Open access 23 July 2018 Pages: 1041 - 1055
Structure and ultrastructure of floral nectaries of two Opuntia species (Cactaceae) in relation to their floral visitors Juan I. AgüeroBeatriz G. GalatiJuan P. Torretta Original Article 24 July 2018 Pages: 1057 - 1067