| The biology of Canadian weeds. 130. Amaranthus retroflexus L., A. powellii S. Watson and A. hybridus L. M Costea, SE Weaver, FJ Tardif Canadian journal of plant science 84 (2), 631-668, 2004 | 268 | 2004 |
| The biology of Canadian weeds. 133. Cuscuta campestris Yuncker, C. gronovii Willd. ex Schult., C. umbrosa Beyr. ex Hook., C. epithymum (L.) L. and C. epilinum Weihe. M Costea, FJ Tardif Canadian Journal of Plant Science 86 (1), 293-316, 2006 | 183 | 2006 |
| Preliminary results toward a revision of the Amaranthus hybridus species complex (Amaranthaceae) M Costea, A Sanders, G Waines Sida, Contributions to Botany, 931-974, 2001 | 164 | 2001 |
| The biology of invasive alien plants in Canada. 3. Amaranthus tuberculatus (Moq.) Sauer var. rudis (Sauer) Costea & Tardif M Costea, SE Weaver, FJ Tardif Canadian journal of plant science 85 (2), 507-522, 2005 | 145 | 2005 |
| A mutation in the herbicide target site acetohydroxyacid synthase produces morphological and structural alterations and reduces fitness in Amaranthus powellii FJ Tardif, I Rajcan, M Costea New Phytologist 169 (2), 251-264, 2006 | 144 | 2006 |
| Stem morphology and anatomy in Amaranthus L.(Amaranthaceae), taxonomic significance M Costea, DA DeMason Journal of the Torrey Botanical Society, 254-281, 2001 | 143 | 2001 |
| Delimitation of major lineages within Cuscuta subgenus Grammica (Convolvulaceae) using plastid and nuclear DNA sequences S Stefanović, M Kuzmina, M Costea American Journal of Botany 94 (4), 568-589, 2007 | 128 | 2007 |
| Phylogeny, character evolution, and biogeography of Cuscuta (dodders; Convolvulaceae) inferred from coding plastid and nuclear sequences MA García, M Costea, M Kuzmina, S Stefanović American journal of botany 101 (4), 670-690, 2014 | 118 | 2014 |
| Polygonaceae. Vol. 5. Flora of North America CC Freeman, R J.L. Oxford University Press, 2005 | 115* | 2005 |
| A phylogenetically based infrageneric classification of the parasitic plant genus Cuscuta (dodders, Convolvulaceae) M Costea, MA García, S Stefanović Systematic Botany 40 (1), 269-285, 2015 | 86 | 2015 |
| Pollen evolution and its taxonomic significance in Cuscuta (dodders, Convolvulaceae) M Welsh, S Stefanović, M Costea Plant Systematics and Evolution 285, 83-101, 2010 | 66 | 2010 |
| Cuscuta jepsonii (Convolvulaceae): An invasive weed or an extinct endemic? M Costea, S Stefanović American Journal of Botany 96 (9), 1744-1750, 2009 | 64 | 2009 |
| Taxonomy of the Cuscuta pentagona complex (Convolvulaceae) in North America M Costea, GL Nesom, S Stefanović SIDA, contributions to botany, 151-175, 2006 | 63 | 2006 |
| Delimitation of Amaranthus cruentus L. and Amaranthus caudatus L. using micromorphology and AFLP analysis: an application in germplasm identification M Costea, DM Brenner, FJ Tardif, YF Tan, M Sun Genetic Resources and Crop Evolution 53, 1625-1633, 2006 | 60 | 2006 |
| The biology of Canadian weeds. 131. Polygonum aviculare M Costea, FJ Tardif Canadian journal of plant science 85 (2), 481-506, 2005 | 60 | 2005 |
| Evolutionary history and taxonomy of the Cuscuta umbellata complex (Convolvulaceae): Evidence of extensive hybridization from discordant nuclear and plastid … M Costea, S Stefanović Taxon 59 (6), 1783-1800, 2010 | 57 | 2010 |
| Guide to the vascular plants of Tennessee Tennessee Flora Committee Univ. of Tennessee Press, 2015 | 56 | 2015 |
| Diversity and evolution of the gynoecium in Cuscuta (dodders, Convolvulaceae) in relation to their reproductive biology: two styles are better than one MAR Wright, M Welsh, M Costea Plant Systematics and Evolution 296, 51-76, 2011 | 48 | 2011 |
| Systematics of Cuscuta chinensis species complex (subgenus Grammica, Convolvulaceae): evidence for long-distance dispersal and one new species M Costea, I Spence, S Stefanović Organisms Diversity & Evolution, 1-14, 2011 | 47 | 2011 |
| Notes on some little known Amaranthus taxa (Amaranthaceae) in the United States M Costea, A Sanders, G Waines Sida, Contributions to Botany, 975-992, 2001 | 46 | 2001 |
