These often pale, essentially leafless plants obviously derive some of 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.

B. paniculata

1. Mid-cauline leaves opposite or subopposite; anthers ca. 0.5-0.9 (-1.1) mm long.

B. virginica