BALFOUR—NEW SPECIES OF RHODODENDRON. 313 
This is very different from the punctulation found in sub- 
series B. The species showing the character I mention are :-— 
Rh. achroanthum, Balf. f. et W. W. Sm. 
Rh. capitatum, Maxim. 
Rh. chryseum, Balf. f. et Ward. 
Rh. lapponicum, Wahlenb. 
Rh. parvifolium. Adams. 
Rh. polycladum, Franch. 
Rh. rupicolum, W. W. Sm. 
Rh. violaceum, Rehd. et Wils. 
I think that the species thus brought together may be 
regarded as more nearly allied to one another than to other 
species, but the specific differences are marked. In habit they 
range from prostrate shrubs like Rh. lapponicum to erect shrubs 
of a meter high or more. Rh. chryseum is said to be a “ dwarf.” 
The flower trusses are most usually 3~-5-flowered. In RA. 
lapponicum i-flowered. In Rh. violaceum 1-3-flowered. In Rh. 
chryseum and Rh. parvifolium 6-7-flowered. Flower colour is 
distinctive in some species—some shade of violet purple in 
most of them ; it is a dark almost purple black in Rh. rupicolum, 
rose in Rh. capitatum and Rh. achroanthum, yellow in Rh. chry- 
seum. Lepidote corollas characterise Rh. achroanthum, Rh. 
chryseum, and Rh. rupicolum. The stamens are 5 in Rh. achro- 
anthum and Rh. chryseum, 5-6 in Rh. lapponicum, 8-10 in Rh. 
capitatum and Rh. rupicolum, 10 in all the others. The style 
always exserted and longer than the stamens is glabrous in 
Rh. sion ge Rh. polyeladsen, Rh. parvifolium, and Rh. 
vtolac 
KEY TO THE SPECIES. 
I. Corolla lepidote ; og ‘ ‘ ‘: 3 
Corolla elepidote ; : . : : ; : 
2. Flowers yellow A ‘ . chryseum. 
Flowers rose or purple tinted . . ; ; ‘ 
3. Corolla rose. Stamens 5 ‘ ? . achroanthum. 
Corolla black purple. Stamens ro . ; rupicolum. 
4. Leaves oblong or sublanceolate, narrowed ‘6 
each end. ; . 
Leaves ovate to elliptic, rounded at each end : : %. 
5. Style hairy, longer than stamens : ‘ capitatum. 
Style glabrous, longer than stamens i : c 6. 
6. Inflorescence 1-flowered ‘ é 3 é icum. 
Inflorescence 3-5-flowered . ; i .  polycladum. 
Inflorescence 6-7-flowered . “ , .  parvifolinum. 
7. Inflorescence I-flowered. Stamens 5-6 . . lapponicum. 
Inflorescence 1-3-flowered. Stamens 8-10 . . violaceum, 
