306 BALFOUR—NEW SPECIES OF RHODODENDRON. 
like tube in most species, and it opens into a broad funnel limb 
with five usually crenulate lobes spreading wide open in full 
flower—the lobes as long as the rest of the corolla, but in three 
species—Rh. blepharocalyx, Rh. complexum, and Rh. tntricatum— 
the tube is elongated cylindric ventricose at base, constricted at 
the mouth, and the limb is nearly patent. So distinct is this 
that the right of these species to a position within the series may 
be doubted. They form a small group intermediate between the 
Lapponicum and the Cephalanthum series. The colour varies 
from rose-pink to purple and violet ; in Rh. chryseum and Rh. 
flavidum it is yellow—an interesting contrast with the Cepha- 
lanthums, in which yellow and white are the dominant colours. 
The corolla is always lined inside by hairs and two states have to 
be recognised. The stamens in the funnel flowers project far 
beyond the mouth of the corolla tube, which is plugged by a mass 
of hairs in part derived from the corolla tube, in part from the 
staminal filaments. In the flowers with elongated corolla tube 
the stamens do not or hardly project from the tube, and no hairs 
are visible in the open flower. The two states are noticeable at 
sight. There remains one character of the corolla to notice which 
is a thoroughly good differentiating one. Some species have the 
corolla lepidote outside right from the corolla tube to the top of the 
lobes—sometimes slightly, other times copiously. It is a character 
I trust. The species in which the lepidote corolla occurs are :— 
Rh. achroanthum, Balf. f. 
Rh. chryseum, Balf. f. et Ward. 
Rh. cuneatum, W. W. Sm 
Rh. diacritum, Balf. f. et W. W. Sm. 
Rh. drumonium, Balf. f. et Ward. 
Rh. flavidum, Franch. 
Rh. itdoneum, Balf. f. et W. W. Sm. 
Rh. pycnocladum, Balf. f. et W. W. Sm. 
Rh. rupicolum, W. W. Sm. 
Rh. telmateium, Balf. f. et W. W. Sm. 
Rh. verruculosum, Rehd. et Wils. 
In the few cases where the number of the stamens is 5 it 
seems to be a definite mark for diagnosis. Fluctuations from 
8—ro are. so common that these higher figures are of no diagnostic 
import. There are differences in the breadth of the filaments 
which in dried specimens seem to suggest a differential character, 
but further investigation must determine this. All the Lap- 
ponicum Rhododendrons have hairs upon the filaments. The 
portion of the filament from the upper third of the ovary down- 
wards is commonly slightly broader and bare of hairs, the region 
_ immediately above this and therefore encircling the top of the 
