Lectotypification of Didymaea mexicana Hook. f. (Rubiaceae, Rubieae) and the identity of D. alsinoides (Schltdl. & Cham.) Standl. Údair: Lorence, David

A phylogenetic list of the genera of Rubiaceae in Mexico Údair: Lorence, David H.

Hoffmannia rzedowskiana (Rubiaceae), a new species of southern Mexico and Nicaragua Údair: Castillo-Campos, Gonzalo, Bautista Bello, Alma Patricia, Lorence, David H.