| BupleurumL.(Umbelliferae) in Europe — 1. The annuals,B.sect.Bupleurumand sect.Aristata | 2001/12/17 | English | 26 |
| Two new species ofCentaurea (Compositae, Cardueae)from Turkey | 2006/02/27 | English | 26 |
| Algae of the Ehrenberg collection — 1. Typification of 32 names of diatom taxa described by C. G. Ehrenberg | 2014/12/22 | | 25 |
| Euro+Med-Checklist Notulae, 9 | 2018/07/01 | | 22 |
| A phylogenetic analysis ofPfeifferaand the reinstatement ofLymanbensoniaas an independently evolved lineage of epiphyticCactaceaewithin a new tribeLymanbensonieae | 2010/12/01 | English | 21 |
| Arundo (Gramineae) in the Mediterranean reconsidered | 2004/12/22 | | 21 |
| Cytological investigations on Bulgarian phanerogams | 2006/02/27 | English | 21 |
| New and noteworthy records for the flora of Yemen, chiefly of Hadhramout and Al-Mahra | 2002/12/13 | English | 21 |
| The inclusion of adventive plants in the second edition of Flora Palaestina | 2000/12/08 | English | 21 |
| The vascular flora of the Byzantine Walls of Thessaloniki (N Greece) | 1999/10/01 | English | 21 |
| The unusualOndinea, actually just another Australian water-lily ofNymphaeasubg.Anecphya (Nymphaeaceae) | 2009/07/01 | English | 20 |
| The phylogeny ofLinderniaceae— The new genusLinderniella, and new combinations withinBonnaya, Craterostigma, Lindernia, Micranthemum, ToreniaandVandellia | 2013/12/07 | English | 20 |
| On the taxonomic status and the phylogenetic relationships of some unispecific Mediterranean genera of Compositae-Anthemideae II. Daveaua, Leucocyclus and Nananthea | 2004/12/22 | | 20 |
| Palynological contribution to the systematics ofRinderaand the allied generaParacaryumandSolenanthus (Boraginaceae-Cynoglosseae) | 2006/02/27 | English | 20 |
| A contribution to the vascular plant flora of Lower Ladakh (Jammu & Kashmir, India) | 2005/08/31 | | 20 |
| RareSurirellataxa(Bacillariophyta)from East Africa described by Otto Müller: typifications, recombinations, new names, annotations and distributions | 2005/12/21 | English | 19 |
| Contribution to the study of the Greek flora: Flora and vegetation of the E Aegean islands Agathonisi and Pharmakonisi | 1998/04/01 | English | 19 |
| A new species ofCentaureasect.Psephelloideae (Compositae)from SW Turkey | 1998/04/01 | English | 19 |
| Seseli hartvigii (Apiaceae), a new name for S. ramosissimum Hartvig & Strid, with carpological and ecological notes on this species | 2001/08/31 | | 19 |
| Euro+Med-Checklist Notulae, 8 | 2017/10/01 | English | 19 |
| Contributions to the flora of Albania, 4 | 2013/06/21 | English | 18 |
| Euro+Med-Checklist Notulae, 6 | 2016/09/01 | English | 18 |
| Zelkova abelicea (Ulmaceae) in Crete: floristics, ecology, propagation and threats | 2006/02/27 | | 18 |
| Changes in the circumscription of the genus Achillea (Compositae-Anthemideae) and its subdivision | 2005/08/31 | | 18 |
| Euro+Med-Checklist Notulae, 12 | 2020/07/17 | | 18 |
| The Euro+Med treatment ofGnaphalieaeandInuleae (Compositae)— generic concepts and required new names | 2003/12/22 | English | 18 |
| A cytological study of 28 phanerogams from the mountains of SE Sterea Ellas, Greece | 1997/11/01 | English | 17 |
| A lichenological comparison of the Paros and Santorini island groups (Aegean, Greece), with annotated checklist | 1999/10/01 | English | 17 |
| Molecular phylogeny and taxonomy of the genusDisocactus(Cactaceae), based on the DNA sequences of six chloroplast markers | 2016/03/01 | English | 17 |
| Contributions towards a revised infrageneric classification ofCrepis (Cichorieae, Compositae) | 2009/12/01 | English | 17 |