References

For Youngia

Cronquist, A. 1980. Asteraceae, Volume I, Vascular flora of the Southeastern United States. University of North Carolina Press, Chapel Hill, N.C. Google Scholar

Spurr, P.L. 2006. Youngia. In Flora of North America Editorial Committee. 2006a. Flora of North America north of Mexico. Volume 19, Magnoliophyta: Asteridae, part 6: Asteraceae, part 1. Oxford Univ. Press, New York, NY. 579 pp. Google Scholar

Urbatsch, L.E., J.F. Pruski, and K.M. Neubig. 2013. Youngia thunbergiana (Crepidinae, Cichorieae, Asteraceae), a species overlooked in the North American flora. Castanea 78: 330-337. Google Scholar