For Senecio
Anderson, L.C. 1994. A revision of Hasteola (Asteraceae) in the New World. Syst. Bot. 19: 211-219.
Barkley, T.K. 2000. Senecio quaylei (Asteraceae: Senecioneae), a new species from north central Texas. Sida 19(2): 285-289.
Barkley, T.M. 1978. Senecio. N. Amer. Fl. II 10: 50-139.
Barkley, T.M. 1999. The segregates of Senecio, s.l., and Cacalia, s.l., in the flora of North America north of Mexico. Sida 18: 661-672.
Barkley, T.M. 2006a. Senecio. In Flora of North America Editorial Committee. 2006b. Flora of North America north of Mexico. Volume 20, Magnoliophyta: Asteridae, part 6: Asteraceae, part 2. Oxford Univ. Press, New York, NY. 666 pp.
Bremer, K. 1994. Asteraceae: cladistics and classification. Timber Press, Portland, OR. 752 pp.
Cronquist, A. 1980. Asteraceae, Volume I, Vascular flora of the Southeastern United States. University of North Carolina Press, Chapel Hill, N.C.
Pelser, P.B., B. Nordenstam, J.W. Kadereit, and L.E. Watson. 2007. An ITS phylogeny of tribe Senecionae (Asteraceae) and a new delimitation of Senecio L. Taxon 56: 1077-1104.
Pippen, R.W. 1978. Cacalia. N. Amer. Fl. II 10: 151-159.
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