References
For Hypericum
Adams, W.P. 1957. A revision of the genus Ascyrum (Hypericaceae). Rhodora 59: 73-95. Google Scholar
Adams, W.P. 1962. Studies in the Guttiferae. I. A synopsis of Hypericum section Myriandra. Contr. Gray Herbarium Harv. 182: 1-51. Google Scholar
Adams, W.P. 1973. Clusiaceae of the southeastern United States. J. Elisha Mitchell Sci. Soc. 89: 62-71. Google Scholar
Adams, W.P., and N.K.B. Robson. 1961. A re-evaluation of the generic status of Ascyrum and Crookea (Guttiferae). Rhodora 63: 10-16. Google Scholar
Allison, J.R. 2011. Synopsis of the Hypericum denticulatum complex (Hypericaceae). Castanea 76: 99-115. Google Scholar
Calie, P.J., E.E. Schilling, and D.H. Webb. 1983. Flavonoid chemistry of the generic segregates Ascyrum and Crookea of Hypericum. Biochem. Syst. & Ecol. 11: 107-109. Google Scholar
Cooperrider, T.S. 1989. The Clusiaceae (or Guttiferae) of Ohio. Castanea 54: 1-11. Google Scholar
Culwell, D.E. 1970. A taxonomic study of the section Hypericum in the eastern United States. Ph.D. dissertation, University of North Carolina at Chapel Hill. Google Scholar
Godfrey, R.K. 1988. Trees, shrubs, and woody vines of northern Florida and adjacent Georgia and Alabama. University of Georgia Press, Athens. Google Scholar
Lacroix-Carignan, É., C.J. Chapman-Lam, C.S. Blaney, and É. Léveillé-Bourret. 2024. Imperforate St. John's-Wort (Hypericum maculatum subsp. obtusiusculum): a new overlooked nonnative forb for eastern North America. Rhodora 124(1000): 436-444. Google Scholar
Meseguer, A.S., J.J. Aldasoro, and I. Sanmartín. 2013. Bayesian inference of phylogeny, morphology and range evolution reveals a complex evolutionary history in St. John’s wort (Hypericum). Molec. Phylogen. Evol. 67: 379-403. Google Scholar
Meseguer, A.S., J.M. Lobo, R. Ree, D.J. Beerling, and I. Sanmartín. 2015. Integrating fssils, phylogenies, and niche models into biogeography to reveal ancient evolutionary history: the case of Hypericum (Hypericaceae). Syst. Biol. 64(2): 215-232. Google Scholar
Nürk, N.M., S. Madriñán, M.A. Carine, M.W. Chase, and F.R. Blattner. 2013. Molecular phylogenetics and morphological evolution of St. John’s wort (Hypericum; Hypericaceae). Molec. Phylogen. & Evol. 66: 1-16. Google Scholar
Robson N.K.B. 2001. Studies in the genus Hypericum L. (Guttiferae). 4(1). Sections 7. Roscyna to 9. Hypericum sensu lato (part 1). Bull. British Museum of Natural History (Botany) 31(2): 37-88. Google Scholar
Robson, N.K.B. 1990. Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys. Bull. Nat. Hist. Mus. Lond. (Bot.) 20: 1-151. Google Scholar
Robson, N.K.B. 1996. Studies in the genus Hypericum L. (Guttiferae). 6. Sections 20. Myriandra to 28. Elodes. Bull. Nat. Hist. Mus. Lond. (Bot.) 26: 75-217. Google Scholar
Robson, N.K.B. 2002. Studies in the genus Hypericum L.( Guttiferae). 4(2). Section 9. Hypericum sensu lato (part 2): subsection 1. Hypericum series 1. Hypericum. Bull. Nat. Hist. Mus. Lond. (Bot.) 32: 61-123. Google Scholar
Robson, N.K.B. 2006. Studies in the genus Hypericum L.( Clusiaceae). Section 9. Hypericum sensu lato (part 3): subsection 1. Hypericum series 2. Senanensia, subsection 2. Erecta and section 9b. Graveolentia. Systematics and Biodoiversity 4: 19-98. Google Scholar
Robson, N.K.B. 2015a. Hypericum. 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
Robson, N.K.B., and W.P. Adams. 1968. Chromosome numbers in Hypericum and related genera. Brittonia 20: 95-106. Google Scholar
Robson, N.K.B.. 1985. Studies in the genus Hypericum L. (Guttiferae). 3. Sections 1. Campylosporus to 6a. Umbraculoides. Bull. British Museum of Natural History (Botany) 12: 163–325 Google Scholar
Sorrie, B.A. 2012. Identification, distribution, and habitat of needle-leaved Hypericum (Hypericaceae) in the southeastern United States. Phytoneuron 2012-76: 1-14. Published 13 Aug 2012. ISSN 2153 733X Google Scholar
Stevens. 2007. In Kubitzki, K., C. Bayer, and P.F. Stevens, eds. 2007. The families and genera of vascular plants. IX. Flowering plants – Eudicots – Berberidopsidales, Buxales, Crossosomatales, Fabales p.p., Geraniales, Gunnerales, Myrtales p.p., Proteales, Saxifragales, Vitales, Zygophyllales, Clusiaceae alliance, Passifloraceae alliance, Dilleniaceae, Huaceae, Picramniaceae, Sabiaceae. Springer, Berlin. 509 pp. Google Scholar
Weakley, A.S., R.J. LeBlond, B.A. Sorrie, C.T. Witsell, L.D. Estes, K.G. Mathews, A. Ebihara, and K. Gandhi. 2011. New combinations, rank changes, and nomenclatural and taxonomic comments in the vascular flora of the southeastern United States. J. Bot. Res. Inst. Texas 5: 437-455. Google Scholar
Webb, D.H. 1980. A biosystematic study of Hypericum section Spachium in eastern North America. Ph.D. Diss., University of Tennessee, Knoxville. Google Scholar