For Violaceae
Ballard, H.E., Jr. (in prep.). Violaceae of the Southeastern United States. Google Scholar
Ballard, H.E., Jr., J. de Paula-Souza, and G.A. Wahlert. 2014. Violaceae. In Kubitzki, K., ed. 2014. The families and genera of vascular plants, XI. Flowering plants – Eudicots – Malpighiales. Springer, Berlin. 331 pp. Google Scholar
Ballard, H.E., Jr., J.T. Kartesz, and M. Nishino. 2023. A taxonomic treatment of the violets (Violaceae) of the northeastern United States and adjacent Canada. J. Torrey Bot. Club 150(1): 3-266. Google Scholar
Ballard, H.E., Jr., R.N. Burwell, and S.L. Lockhart. 2020. Violaceae: Typifications and clarifications of names. In Weakley, A.S., D.B. Poindexter, H.C. Medford, B.A. Sorrie, C.A. McCormick, E.L. Bridges, S.L. Orzell, K.A. Bradley, H.E. Ballard, Jr., R.N. Burwell, S.L. Lockhart, and A.R. Franck. 2020. Studies in the vascular flora of the southeastern United States. VI. J. Bot. Res. Inst. Texas 14: 199-240. Google Scholar
Little, R.J., and L.E. McKinney. 2015a. Violaceae. In Flora of North America Editorial Committee. 2015. Flora of North America north of Mexico. Volume 6, Magnoliophyta: Cucurbitaceae to Droseraceae. Oxford Univ. Press, New York, NY. 468 pp. Google Scholar
McKinney, L.E., and N.H. Russell. 2002. Violaceae of the southeastern United States. Castanea 67: 369-379. Google Scholar
Paula-Souza, J. de., and H.E. Ballard, Jr. 2014. Re-establishment of the name Pombalia, and new combinations from the polyphyletic Hybanthus (Violaceae). Phytotaxa 183: 1-15. Google Scholar
Wahlert, G.A., T. Marcussen, J. de Paula-Souza, M. Feng, and H.E. Ballard, Jr. 2014. A phylogeny of the Violaceae (Malpighiales) inferred from plastid DNA sequences: implications for generic diversity and intrafamilial classification. Syst. Bot. 39: 239-252. Google Scholar