Plate 31. Map Showing the Distribution

of the Genus Magnolia in the United States.
EXPLANATION.
Blue ------ Boundary line of Magnolia acuminata.
Blue ____ Boundary line of Magnolia Fraseri.
Blue ........ Northern boundary line of Magnolia grandiflora.
Red ......... Boundary line of Magnolia macrophylla.
Red _____ Boundary line of Magnolia Umbrella. Red ------- Boundary line of Magnolia glauca. Red Spot—Place where Magnolia cordata was originally discovered. This image is from Magnolia in the Drugs and Medicines of North America.