M. UMBRELLA (syn M. tripetala).—­Umbrella Tree.  North America, 1752.  A noble species, with large, deep green leaves, that are often 16 inches long.  It is quite hardy around London, and produces its large, white, fragrant flowers in succession during May and June.  The fruit is large and showy, and of a deep purplish-red colour.

MEDICAGO.

MEDICAGO ARBOREA.—­South Europe, 1596.  This species grows to the height of 6 feet or 8 feet, and produces its Pea-shaped flowers from June onwards.  The leaves are broadly oval and serrated at the tips, but they vary in this respect.  It is not hardy unless in warm, sheltered corners of southern England and Ireland, although it stood unharmed for many years at Kew.  It succeeds best, and is less apt to receive injury, when planted in rather dry and warm soil.

MENISPERMUM.

MENISPERMUM CANADENSE.—­Moonseed.  North America, 1691.  This shrub is principally remarkable for the large, reniform, peltate leaves, which are of value for covering pergolas, bowers and walls.  The flowers are of no great account, being rather inconspicuous and paniculate.  It is hardy in most places, and is worthy of culture for its graceful habit and handsome foliage.

MICROGLOSSA.

MICROGLOSSA ALBESCENS (syn Aster albescens and A. cabulicus).—­Himalayas, 1842.  This member of the Compositae family is a much-branched shrub, with grayish lanceolate foliage, and clusters of flowers about 6 inches in diameter, and of a bluish or mauve colour.  It is a native of Nepaul, and, with the protection of a wall, perfectly hardy around London.

MITCHELLA.

MITCHELLA REPENS.—­Partridge Berry.  North America, 1761.  A low-growing, creeping plant, having oval, persistent leaves, white flowers, and brilliant scarlet fruit.  It is a neat little bog plant, resembling Fuchsia procumbens in habit, and with bunches of the brightest Cotoneaster-like fruit.  For rock gardening, or planting on the margins of beds in light, peaty soil, this is one of the handsomest and most beautiful of hardy creeping shrubs.

MITRARIA.

MITRARIA COCCINEA.—­Scarlet Mitre Pod.  Chiloe, 1848.  This is only hardy in the South of England and Ireland, and even there it requires wall protection.  It is a pretty little shrub, with long, slender shoots, which, during the early part of the summer, are studded with the bright red, drooping blossoms, which are urn-shaped, and often nearly 2 inches long.  It delights in damp, lumpy, peat.

MYRICA.

MYRICA ASPLENIFOLIA (syn Comptonia asplenifolia).—­Sweet Fern.  North America, 1714.  A North American plant of somewhat straggling growth, growing to about 4 feet high, and with linear, pinnatified, sweet-smelling leaves.  The flowers are of no decorative value, being small and inconspicuous, but for the fragrant leaves alone the shrub will always be prized.  It grows well in peaty soil, is very hardy, and may be increased by means of offsets.  This shrub is nearly allied to our native Myrica or Sweet Gale.