Stenaria nigricans (Lam.) Terrell var. nigricans Stenaria nigricans (Lam.) Terrell var. nigricans in Sida 19(3): 600. 2001 sec. Govaerts 2013=Houstonia angustifolia Michx., Fl. Bor.-Amer. 1: 85–86. 1803 syn. sec. The Plant List 2013