Cephaelis Sw.
Engl.: cephaelis.

Cephaelis acuminata:

Cephaelis acuminata H. Karst., Rubiaceae: See Carapichea ipecacuanha (Brot.) L. Anders.

Cephaelis emetica:

Cephaelis emetica (L. f.) Pers., Rubiaceae: See Ronabea emetica (L. f.) A. Rich.

Cephaelis ipecacuanha:

Cephaelis ipecacuanha (Brot.) Tussac, Rubiaceae: See Carapichea ipecacuanha (Brot.) L. Andersson., See Psychotria ipecacuanha (Brot.) Stokes.

Cephaelis tomentosa:

Cephaelis tomentosa (Aubl.) Vahl, Rubiaceae: See Psychotria poeppigiana Müll. Arg.

I have no articles for this botanical term, but there might be some for the next level down (if found).