Melanthium virginium, xi, 178.
Monarda allophylla, iv, 56.
— Bradburiana, x, 260.
— scabra, x, 260.
Mosses and Ferns of the United States, by L. C. Beck, xv, 287.
Mucedinea, on vines, xxix, 367.
Muhlenbergia filipes, xliv, 83.
Mylocarium ligustrinum, xxvi, 319.
Myosotis inflexa, xlvi, 98.
— macrosperma, xlvi, 98.