References

For Pyrola

Freeman, C.C. 2009b. Pyrola. In Flora of North America Editorial Committee. 2009. Flora of North America north of Mexico. Volume 8, Magnoliophyta: Paeoniaceae to Ericaceae. Oxford Univ. Press, New York, NY. 585 pp. Google Scholar

Liu, Z.-W., J. Zhou, E.-D. Liu, and H. Peng. 2010. A molecular phylogeny and a new classification of Pyrola (Pyroleae, Ericaceae). Taxon 59: 1690-1700. Google Scholar

Stevens, P.F., et al. 2004. Ericaceae. 145-194. In Kubitzki, K., ed. 2004. The families and genera of vascular plants. VI. Flowering plants – Dicotyledons – Celastrales, Oxalidales, Rosales, Cornales, Ericales. Springer, Berlin. 489 pp. Google Scholar