"Dicotyledones Rubiaceae." . . "Rubiaceae Classificazione." . . "Galium." . . "The polygamous species of the genus galium (Rubiaceae), section Lophogalium, of Mexico and southwestern United States" . "The polygamous species of the genus Galium (Rubiaceae), section Lophogalium, of Mexico and southwestern United States" . . "The polygamous species of the genus Galium (Rubiaceae), section Lophogalium, of Mexico and Southwestern United States" . . . . . . . . "The Polygamous species of the genus Galium (Rubiaceae), section Lophogalium, of Mexico and Southwestern United States" . . . . . . . . . "The polygamous species of the genus Galium (Rubiaceae) section Lophogalium, of Mexico and southwestern United States" . . . .