R. VISCOSUM (_syn Azalea viscosa_).--Clammy Azalea, or Swamp
Honeysuckle. North America, 1734. This is one of the hardiest, most
floriferous, and easily managed of the family. The white or rose and
deliciously fragrant flowers are produced in great abundance, and impart
when at their best quite a charm to the shrub. It delights in rather
moist, peaty soil, and grows all the stronger and flowers all the more
freely when surrounded by rising ground or tall trees at considerable
distance away. The variety R. viscosum glaucum has leaves paler than
those of the species; and R. viscosum nitidum, of dwarf, compact growth,
has leaves deep green on both sides.

R. WILSONI, a cross between R. ciliatum and R. glaucum, is of remarkably
neat growth, and worthy of cultivation where small-sized kinds are a
desideratum.

The following Himalayan species have been found to thrive well in the
warmer parts of England, and in close proximity to the sea;--R.
argenteum, R. arboreum, R. Aucklandii, R. barbatum, R. ciliatum, R.
campanulatum, R. cinnabarinum, R. Campbelli, R. compylocarpum, R.
eximium, R. Fortunei, R. Falconeri, R. glaucum, R. Hodgsoni, R. lanatum,
R. niveum, R. Roylei, R. Thompsoni, and R. Wallichii.

R. Ungernii and R. Smirnowii, from the Armenian frontier, are also
worthy of culture, but they are at present rare in cultivation in this
country.

Few hardy shrubs, it must be admitted, are more beautiful than these
Rhododendrons, none flowering more freely or lasting longer in bloom.
Their requirements are by no means hard to meet, light, peaty soil, or