280 Lericacee —Rhododendron. 
4. Rh. Caucdsicwm—A small shrub about a yard high. 
Leaves obovate or lanceolate. Flowers campanulate, white 
within, rosy-pink outside, and spotted with green in the throat. 
This grows at a great elevation in the Caucasus Mountains, 
is perfectly hardy, and has produced several varieties supe- 
rior in beauty to the typical form. The following are some 
of the best varieties, or perhaps, in some instances, hybrids, of 
this species: Prince Camille de Rohan, with large white undu- 
lated corollas finely spotted with brown; straminewm, clear 
pale yellow ; pulchérrimum, rose; and élbum, white. 
5. Rh. Pénticum.—This is the common species of gardens, 
having, in the ordinary variety, pale purplish-violet spotted 
flowers. It isthe hardiest. of all the large-flowered ones, and less 
exacting in regard to soil and situation, and the one generally 
employed as a stock for grafting the tenderer kinds upon. In 
favourable situations it will attain a large size fora bush, occa- 
sionally a height of 20 feet with a corresponding spread of 
aN . 
MN 
Fig. 158. Rhododendron arboreum. (} nat. size.) 
branches. There are white, scarlet, pink, and purplish violet 
varieties, variously spotted with yellow, green or brown, and 
also double-flowered ones. The most remarkable in the latter 
category is the variety called Verwwanum. This species is a 
native of Asia Minor and the Iberian peninsula, without any 
known intermediate stations. 
