| Four new species of Aloe (Aloaceae) from Ethiopia, with notes on the ethics of describing new taxa from foreign countries S Demissew, I Friis, T Awas, P Wilkin, O Weber, S Bachman, I Nordal Kew Bulletin 66, 111-121, 2011 | 43 | 2011 |
| A genus-level phylogenetic linear sequence of monocots A Trias-Blasi, WJ Baker, AJ Haigh, DA Simpson, O Weber, P Wilkin Taxon 27, 30, 2015 | 25 | 2015 |
| Diversity and endemism of the flora of Ethiopia and Eritrea: state of knowledge and future perspectives S Demissew, I Friis, O Weber Rendiconti Lincei. Scienze Fisiche e Naturali 32, 675-697, 2021 | 21 | 2021 |
| Dioscorea orangeana (Dioscoreaceae), a new and threatened species of edible yam from northern Madagascar P Wilkin, A Hladik, O Weber, C Marcel Hladik, V Jeannoda Kew Bulletin 64 (3), 461-468, 2009 | 16 | 2009 |
| A New Species of Yam from Kenya, Dioscorea kituiensis Pollen Morphology, Conservation Status, and Speciation P Wilkin, AM Muasya, H Banks, CA Furness, K Vollesen, O Weber, ... Systematic Botany 34 (4), 652-659, 2009 | 15 | 2009 |
| Extinction risk and conservation gaps for Aloe (Asphodelaceae) in the Horn of Africa SP Bachman, P Wilkin, T Reader, R Field, O Weber, I Nordal, S Demissew Biodiversity and Conservation 29 (1), 77-98, 2020 | 13 | 2020 |
| A new species of edible yam (Dioscorea L.) from western Madagascar O Weber, P Wilkin, F Rakotonasolo Kew Bulletin, 283-291, 2005 | 11 | 2005 |
| Two distinctive new species of Commicarpus (Nyctaginaceae) from gypsum outcrops in eastern Ethiopia I Friis, MG Gilbert, O Weber, S Demissew Kew bulletin 71 (3), 34, 2016 | 10 | 2016 |
| The threatened edible yams of the Dioscorea sambiranensis R. Knuth species complex (Dioscoreaceae): a new species and subspecies P Wilkin, A Hladik, V Jeannoda, O Weber Adansonia 31 (2), 249-266, 2009 | 9 | 2009 |
| New species of Gladiolus L. and Moraea Mill. (Iridaceae) from Tanzania and Mozambique P Goldblatt, JC Manning, R Von Blittersdorff, O Weber Kew Bulletin 69, 1-8, 2014 | 6 | 2014 |
| The Western Woodland of Ethiopia - A study of the woody vegetation and flora between the Ethiopian Highlands and the lowlands of the Nile Valley in the Sudan and South Sudan. I Friis, P van Breugel, O Weber, S Demissew Scientia Danica. Series B, Biologica 9, 521, 2022 | 5 | 2022 |
| Crotalaria trifoliolata (Leguminosae: Papilionoideae), a previously incompletely known Ethiopian endemic rediscovered after 120 years I Friis, O Weber Kew Bulletin 69, 1-9, 2014 | 5 | 2014 |
| Phenology and morphology of the invasive legume Lupinus polyphyllus along a latitudinal gradient in Europe K Ludewig, YP Klinger, TW Donath, L Bärmann, C Eichberg, JG Thomsen, ... NeoBiota 78, 185-206, 2022 | 4 | 2022 |
| Digitisation of the LUX herbarium collection of the National Museum of Natural History Luxembourg T Helminger, O Weber, P Braun Bulletin de la Société des naturalistes luxembourgeois 122, 147-152, 2020 | 4 | 2020 |
| Euphorbia veneficaTrémaux ex Kotschy (Euphorbiaceae) and other shrub-like cylindrically stemmed Euphorbia with spirally arranged single spines O Weber, E Atinafe, T Awas, I Friis Bull. Soc. Nat. luxemb 122, 57, 2020 | 3 | 2020 |
| The Gerire Hills, a SE Ethiopian outpost of the transitional semi-evergreen bushland: vegetation, endemism and three new species, Croton elkerensis (Euphorbiaceae), Gnidia … I Friis, MG Gilbert, AJ Paton, O Weber, P van Breugel, S Demissew Webbia 73 (2), 1-21, 2018 | 3 | 2018 |
| Kalanchoe hypseloleuce (Crassulaceae), a new species from eastern Ethiopia, with notes on its habitat I Friis, MG Gilbert, P van Breugel, O Weber, S Demissew Kew Bulletin 72 (2), 30, 2017 | 3 | 2017 |
| Mastigostyla I. M. Johnst. in Bolivia: three new species and new data on M. cardenasii R. C. Foster H Huaylla, P Wilkin, O Weber Kew Bulletin 65, 241-254, 2010 | 2 | 2010 |
| The endangered Ethiopian endemic Crotalaria trifoliolata (Leguminosae-Papilionoideae) and its little-known habitat I Friis, O Weber, P van Breugel, S Demissew Symbolae Botanicae Upsalienses 38, 19-39, 2016 | 1 | 2016 |
| Eriospermum adpressifolium (Asparagaceae) and Emilia blittersdorffii (Asteraceae) — two new species from Tanzania with nearly identical leaves O Weber, R von Blittersdorff, H Beentje Kew bulletin 70, 1-8, 2015 | 1 | 2015 |
Ib FriisProfessor emeritus i systematisk botanik og plantegeografi, Københavns UniversitetVerified email at snm.ku.dk
