These often pale, essentially leafless plants obviously derive their nutrition from other plants, but whether or not with the aid of a fungus seems to be unknown.
1. Mid-cauline leaves alternate; anthers ca. 0.3–0.5 mm long.
1. Mid-cauline leaves opposite or subopposite; anthers ca. 0.5–0.9 (–1.1) mm long.
All species found in Bartonia
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. May 20, 2019. https://www.michiganflora.net/genus.aspx?id=Bartonia.