The following list includes some of the best and most beautiful of these varieties:—­

Alba marginata. 
Ardens. 
Astreans. 
Aurore-de-Royghen. 
Baron G. Pyke. 
BeautE Celeste. 
Bessie Holdaway. 
Belle Merveille. 
Bijou des Amateurs. 
Cardinal. 
Charles Bowman. 
Comte de Flanders. 
Decus hortorum. 
Due de Provence. 
Emperor Napoleon III. 
Eugenie. 
Fitz Quihou. 
Glorie de Belgique. 
Gloria Mundi. 
Gueldres Rose. 
Honneur de Flandre. 
Imperator. 
Jules Caesar. 
La Superbe. 
Louis Hellebuyck. 
Madame Baumann. 
Marie Verschaffelt. 
Mathilde. 
Meteor. 
Nancy Waterer. 
Ne Plus Ultra. 
Optima. 
Pallas. 
Queen Victoria. 
Reine des Belges. 
Remarquable. 
Roi des Belges. 
Roi des Feux. 
Sinensis rosea. 
Sulphurea. 
Triumphans. 
Unique. 
Viscocephala.

Double-flowered Rhododendrons:—­

Bijou de Gendbrugge. 
Graf Von Meran. 
Heroine. 
Narcissiflora. 
Louis AimEe Van Houtte. 
Mina Van Houtte. 
OphiriE. 
Van Houttei.

RHODOTHAMNUS.

RHODOTHAMNUS CHAMAECISTUS (syn Rhododendron Chamaecistus).—­Ground Cistus.  Alps of Austria and Bavaria, 1786.  A very handsome shrub, of small growth, and widely distributed in Bavaria, Switzerland, and elsewhere.  Planted in peaty soil and in a rather damp, shady situation it thrives best, the oval-serrate leaves, covered with white, villous hairs, and pretty rosy flowers, giving it an almost unique appearance.  It is a charming rock shrub and perfectly hardy.

RHODOTYPOS.

RHODOTYPOS KERRIOIDES.—­White Kerria.  Japan, 1866.  A handsome deciduous shrub, and one that is readily propagated, and comparatively cheap.  It is distinct and pretty when in flower, and one of the hardiest and most accommodating of shrubs.  The leaves are handsome, being deeply serrated and silky on the under sides, while the pure white flowers are often about 2 inches across.  It grows about 4 feet in height, and is a very distinct and desirable shrub.

RHUS.

RHUS COTINUS.—­Smoke Plant, Wig Tree, or Venetian Sumach.  Spain to Caucasus, 1656.  On account of its singular appearance this shrub always attracts the attention of even the most unobservant in such matters.  It is a spreading shrub, about 6 feet high, with rotundate, glaucous leaves, on long petioles.  The flowers are small and inconspicuous, but the feathery nature of the flower clusters, occasioned by the transformation of the pedicels and hairs into fluffy awns, renders this Sumach one of the most curious and attractive of hardy shrubs.  Spreading about freely, this south European shrub should be allowed plenty of room so that it may become perfectly developed.