Hedyotis was formerly defined very broadly by some authors, and included species now placed in Oldenlandia, Oldenlandiopsis, Houstonia, Kadua, and other genera.
Houstonia (genus) is a genus of flowering plants, belonging to the madder family (Rubiaceae)
Other plants found in cataract bogs are limeseep grass-of-Parnassus (Parnassia grandifolia), Indian paint brush (Castilleja coccinea), stiff cowbane (Oxypolis rigidior), Appalachian bluet (Houstonia serpyllifolia) and northern sundrops (Oenothera tetragona).