| Checklist of the flowering plants of Sub-Saharan Africa: An index of accepted names and synonyms. SABONET Report No 42 RR Klopper, C Chatelain, C Habashi, L Gautier, RE Spichiger SABONET, 2006 | 156 | 2006 |
| Evolutionary history and leaf succulence as explanations for medicinal use in aloes and the global popularity of Aloe vera OM Grace, S Buerki, MRE Symonds, F Forest, AE van Wyk, GF Smith, ... BMC evolutionary biology 15 (1), 29, 2015 | 131 | 2015 |
| Floristics of the angiosperm flora of Sub-Saharan Africa: an analysis of the African Plant Checklist and Database RR Klopper, L Gautier, C Chatelain, GF Smith, R Spichiger Taxon 56 (1), 201-208, 2007 | 80 | 2007 |
| A revised generic classification for Aloe (Xanthorrhoeaceae subfam. Asphodeloideae) OM Grace, RR Klopper, GF Smith, NR Crouch, E Figueiredo, N Rønsted, ... Phytotaxa 76 (1), 7-14, 2013 | 71 | 2013 |
| Ferns of Southern Africa, A comprehensive guide NR Crouch, RR Klopper, JE Burrows, SM Burrows Struik Nature, Cape Town., 2011 | 64* | 2011 |
| The aloe names book. O GRACE, RR Klopper, E Figueiredo, GF Smith Strelitzia 28, 2011 | 61* | 2011 |
| The global taxonomy initiative in Africa RR Klopper, GF Smith, AC Chikuni Taxon 51 (1), 159-165, 2002 | 32 | 2002 |
| Aloe arborescens (Asphodelaceae: Alooideae) and CITES GF Smith, RR Klopper, NR Crouch Haseltonia 14, 189-198, 2008 | 30 | 2008 |
| The price of collecting life. Overcoming the challenges involved in computerising herbarium specimens. GF Smith, Y Steenkamp, RR Klopper, SJ Siebert, TH Arnold Nature 422 (6930), 375-376, 2003 | 28 | 2003 |
| The biodiversity of Africa RR Klopper, GF Smith, J Van Rooy Rebirth of Science in Africa: A Shared Vision for Life and Environmental …, 2002 | 26 | 2002 |
| The genus Aloe (Asphodelaceae: Alooideae) in Namaqualand, South Africa RR Klopper, GF Smith Haseltonia 13, 38-51, 2007 | 24 | 2007 |
| Aspects of the taxonomy of Aloe arborescens Mill.(Asphodelaceae: Alooideae) GF Smith, RR Klopper, E Figueiredo, NR Crouch Bradleya 30, 127-137, 2012 | 23 | 2012 |
| Phylogenetic relationships in the family Asphodelaceae (Asparagales) RR Klopper, AE Van Wyk, GF Smith Biodiversity & Ecology 3, 9-36, 2010 | 21 | 2010 |
| Aloes of the World: African Plants Initiative. An international web-based collaboration to promote scholarly research on Aloe L. GF Smith, M Walters, RR Klopper, NR Crouch Bradleya 26, 121-128, 2008 | 21 | 2008 |
| Aloe in Angola (Asphodelaceae: Alooideae) RR Klopper, S Matos, E Figueiredo, GF Smith Bothalia 39 (1), 19-35, 2009 | 20 | 2009 |
| The genus Aloe L.(Asphodelaceae: Alooideae) in Malawi RR Klopper, SS Lane, G Msekandiana-Mkwapatira, GF Smith Bradleya 30, 65-92, 2012 | 17 | 2012 |
| A preliminary assessment of the conservation status of the genus Aloe L. in Madagascar SE Rakotoarisoa, RR Klopper, GF Smith BRADLEYA 32, 81-91, 2014 | 16 | 2014 |
| (2129) Proposal to conserve the family name Asphodelaceae (Spermatophyta: Magnoliidae: Asparagales) RR Klopper, GF Smith, AE van Wyk Taxon 62 (2), 402-403, 2013 | 16* | 2013 |
| The genus Salsola (Chenopodiaceae) in southern Africa: Systematic significance of leaf anatomy RR Klopper, AE Van Wyk South African journal of botany 67 (4), 540-551, 2001 | 16 | 2001 |
| Producing a plant diversity portal for South Africa MM le Roux, P Wilkin, K Balkwill, JS Boatwright, B Bytebier, D Filer, ... Taxon 66 (2), 421-431, 2017 | 15 | 2017 |
