Macarthuriaceae
Macarthuria australis
Magnoliaceae
Magnolia martini
Malvaceae
spotted-stalked tree-mallow, annual tree mallow
Marattiaceae
Ptisana purpurascens
Marcgraviaceae
Marcgravia coriacea
Marchantiaceae
Marchantia polymorpha
Matoniaceae
Matonia pectinata
Mayacaceae
Mayaca fluviatilis
Melanthiaceae
Catesby's Trillium, Jones Gap Trillium
Melastomataceae
pale meadow beauty, Maryland meadowbeauty
Menispermaceae
snake vine
Menyanthaceae
wavy marshwort
Misodendraceae
Misodendrum angulatum
Montiaceae
Largeflower fameflower, rock pink, fame flower
Moraceae
sycamore fig, fig-mulberry, sycamore
Morchellaceae
bell morel, the early morel
Musaceae
Vietnam
Myrtaceae
fringed bell