References

For Arctium

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

Duistermaat, H. 1996. Monograph of Arctium L. (Asteraceae): generic delimitation (including Cousinia Cass. p.p.), revision of the species, pollen morphology, and hybrids. Gorteria Supplement 3, Rijksherbarium, Leiden. Google Scholar

Keil, D.J. 2006h. Arctium. 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