Mary Mark. (Bourq. Lab. Vin.) A seedling of Delaware; from Dr. Stayman. Lacks vigor, hardy, apparently healthy, productive; berry medium, red; flesh tender, juicy, vinous, sweet; very good; ripens with its parent which it closely resembles.
Mary Wylie. (Vin. Rip. Lab.) A hybrid of Clinton and Red Frontignan; from Dr. A. P. Wylie, Chester, South Carolina. Cluster large, loose; berry above medium, yellowish-green; flesh tender, juicy, vinous, delicate; very good; ripens late.
Maryland Purple. Mentioned by Prince in 1830 as a seedling from the woods of Maryland. Berries medium, purple, sweet and juicy; ripens very late.
Mason. A chance seedling of 1881; from Mrs. E. Mason, Lamont, Ottawa County, Michigan. Vigorous; clusters medium, sometimes shouldered, compact; berries large, round, reddish-amber; flesh tender, sweet, vinous, sprightly, slightly foxy; good; ripens just before Worden.
Mason. (Lab.) Mason’s Seedling. A white Concord seedling raised by B. Mason, of Mascoutah, Illinois, about thirty years ago. Moderately vigorous, unproductive; cluster small, compact; berry large, round, light yellowish-green; skin thin; flesh tender, juicy, sweet, sprightly, slightly foxy; ripens a few days before Concord; very persistent; self-fertile.
Mason Renting. (Lab.) Described in Bulletin 10, 1890, Alabama Experiment Station. Vigorous, productive; clusters small, compact; berries small, greenish-yellow; good; ripens with Catawba.
Massachusetts White. (Lab.) A red foxy Labrusca, apparently a wild grape sent out by B. M. Watson, of Plymouth, Massachusetts, about 1860. Utterly worthless and name a misnomer.
Matchless. (Lab. Vin. Bourq.?) Originated by John Burr, of Leavenworth, Kansas, about 1887, Vigorous, hardy; black with heavy bloom; skin thin, tough; flesh tender, sprightly, vinous; very good; ripens with Brighton and hangs well for some time.
Mathilde. (Bourq. Lab. Vin.) Originated by G. A. Ensenberger, Bloomington, Illinois, from seed of Delaware. Vigorous, productive, not quite hardy; cluster large, very compact; berry small to large, round, dark red with lilac bloom; small ones seedless; flesh tender, juicy, vinous; good; very late.
Mauston. (Rip.) A wild vine of Vitis riparia secured by Munson from near Mauston, Wisconsin. Stamens reflexed; cluster small; berry small, black; ripens early.