| Evolution and systematics RS Wallace, AC Gibson Cacti: biology and uses. University of California Press, Berkeley, 1-21, 2002 | 180 | 2002 |
| Phylogenetic implications of rbcL sequence variation in the Asteraceae KJ Kim, RK Jansen, RS Wallace, HJ Michaels, JD Palmer Annals of the Missouri Botanical Garden, 428-445, 1992 | 175 | 1992 |
| Phylogeny of the portulacaceous cohort based on ndhF sequence data WL Applequist, RS Wallace Systematic Botany 26 (2), 406-419, 2001 | 137 | 2001 |
| Molecular systematic study of the Cactaceae: using chloroplast DNA variation to elucidate cactus phylogeny RS Wallace Bradleya 1995 (13), 1-12, 1995 | 112 | 1995 |
| Systematic implications of chloroplast DNA sequence variation in the Opuntioideae RS Wallace, SL Dickie Succulent Plant Research 6, 9-24, 2002 | 108 | 2002 |
| Phylogenetic studies of Mammillaria (Cactaceae)—insights from chloroplast sequence variation and hypothesis testing using the parametric bootstrap CA Butterworth, RS Wallace American Journal of Botany 91 (7), 1086-1098, 2004 | 102 | 2004 |
| Molecular systematics of tribe Cacteae (Cactaceae: Cactoideae): a phylogeny based on rpl16 intron sequence variation CA Butterworth, JH Cota-Sanchez, RS Wallace Systematic Botany 27 (2), 257-270, 2002 | 87 | 2002 |
| Chloroplast DNA variation in the Asteraceae: phylogenetic and evolutionary implications RK Jansen, HJ Michaels, RS Wallace, KJ Kim, SC Keeley, LE Watson, ... Molecular systematics of plants, 252-279, 1992 | 74 | 1992 |
| An intron loss in the chloroplast generpoC1 supports a monophyletic origin for the subfamily Cactoideae of the Cactaceae RS Wallace, JH Cota Current genetics 29, 275-281, 1996 | 72 | 1996 |
| Phylogenetic relationships and patterns of character change in the tribe Lactuceae (Asteraceae) based on chloroplast DNA restriction site variation J Whitton, RS Wallace, RK Jansen Canadian Journal of Botany 73 (7), 1058-1073, 1995 | 67 | 1995 |
| A review of the phylogeny and classification of the Asteraceae K Bremer, RK Jansen, PO Karis, M Källersjö, SC Keeley, KJ Kim, ... Nordic Journal of Botany 12 (2), 141-148, 1992 | 63 | 1992 |
| Systematic implications of chloroplast DNA variation in the genus Microseris (Asteraceae: Lactuceae) RS Wallace, RK Jansen Systematic Botany, 606-616, 1990 | 61 | 1990 |
| Molecular phylogenetics of the leafy cactus genus Pereskia (Cactaceae) CA Butterworth, RS Wallace Systematic Botany 30 (4), 800-808, 2005 | 57 | 2005 |
| Karyotypic studies in the genus Echinocereus (Cactaceae) and their taxonomic significance JH Cota, RS Wallace Caryologia 48 (2), 105-122, 1995 | 46 | 1995 |
| Phylogeny of the Madagascan endemic family Didiereaceae WL Applequist, RS Wallace Plant Systematics and Evolution 221, 157-166, 2000 | 44 | 2000 |
| Systematic implications of chloroplast DNA variation in the subtribe Microseridinae (Asteraceae: Lactuceae) RK Jansen, RS Wallace, KJ Kim, KL Chambers American Journal of Botany 78 (8), 1015-1027, 1991 | 42 | 1991 |
| Deletions in the plastid trnT–trnL intergenic spacer define clades within Cactaceae subfamily Cactoideae WL Applequist, RS Wallace Plant Systematics and Evolution 231, 153-162, 2002 | 40 | 2002 |
| Expanded circumscription of Didiereaceae and its division into three subfamilies WL Applequist, RS Wallace Adansonia 25 (1), 13-16, 2003 | 38 | 2003 |
| Chloroplast DNA evidence for divergence in Ferocactus and its relationships to North American columnar cacti (Cactaceae: Cactoideae) JH Cota, RS Wallace Systematic Botany, 529-542, 1997 | 34 | 1997 |
| Photosynthetic pathway variation in leafy members of two subfamilies of the Cactaceae CE Martin, RS Wallace International Journal of Plant Sciences 161 (4), 639-650, 2000 | 28 | 2000 |
