For Spigelia
Gould, K.R. 1996. A new, disjunct variety of Spigelia gentianoides (Loganiaceae) from Bibb County, Alabama. Sida 17: 417-421.
Gould, K.R. 1997. Systematic studies in Spigelia. Ph.D. dissertation, U. Tex. Austin, Austin, TX.
Gould, K.R., and R.K. Jansen. 1999. Taxonomy and phylogeny of a Gulf coast disjunct group of Spigelia (Loganiaceae sensu lato). Lundellia 2: 1-13.
Henrickson, J. 1996. Notes on Spigelia. Sida 17 (1): 89-103.
Mathews, K.G. 2023. Loganiaceae. In Flora of North America Editorial Committee. 2023c. Flora of North America north of Mexico. Volume 14, Magnoliophyta: Gentianaceae to Hydroleaceae. Oxford Univ. Press, New York, NY. 505 pp.
Rogers, G.K. 1986. The genera of Loganiaceae in the southeastern United States. J. Arnold Arb. 67: 143-185.
Struwe, L., K.L. Gibbons, B.J. Conn, and T.J. Motley. 2018. Loganiaceae. In Kadereit, J., & V. Bittrich. 2018. The families and genera of flowering plants. XV. Flowering plants. Eudicots. Apiales, Gentianales (except Rubiaceae). Springer, Cham.
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.
Cite as...