For Orthilia
Freeman, C.C. 2009e. Orthilia. 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.
Freudenstein, J.V. 1999a. Relationships and character transformation in Pyroloideae (Ericaceae) based on ITS sequences, morphology, and development. Syst. Bot. 24: 398-408.
Stevens et al. 2004. 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.
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