120 BALFOUR—NEW SPECIES OF RHODODENDRON. 
illustration in point. Their specific difference is manifest and 
their close phyletic relation no less so. All the leaves of Rh. 
porphyrophyllum have dark purple-red under surface, all the 
leaves of Rh. evastum have a green under surface. Although 
we do not know the seedling state of either of these species 
their habit and relationships sanction the forecast that in their 
seedling stage both have leaves red on the under side. RA. 
porphyrophyllum has retained the juvenile character in its adult 
state like Rh. Forrestii, Rh. erastum- has parted with it like 
Rh. repens. : 
For the value of the colour-tint of the flower for diagnosis 
between Rh. Forrestii and Rh. repens we must depend upon 
the observation of Forrest. In the nearly allied series of 
Rhododendron which centres round Rh. sanguineum, Franch., 
we have colour-tint of much the same depth and intensity as 
that given by Forrest in this case and it aids in the separation 
of Rh. haemaleum, Balf. f. et Forrest from its near ally Rh. 
sanguineum. So far as dried specimens offer evidence the colour 
in Rh. Forrestii is not so intense as in the darkest of the 
Sanguineum series. Forrest speaks of the Ka-gwr-pw plants of 
Rh. repens as having dark crimson flowers, which would seem 
to weaken the value of the colour-tint as a differential mark 
in the Forrestii series. 
Minor marks of difference between Rh. Forrestii and Rh. 
repens may be tabulated thus :— 
Rh. Forrestii. Rh. repens. 
Pedicels glandular. Pedicels glandular and floccose. 
alyx-lobes fleshy glandular and Calyx-lobes glabrous outside, 
_ gland-fringed. gland-fringed. 
Ovary glandular. Ovary floccose-tomentose. 
The characters seem to me to be constant in the two forms 
respectively and to re-enforce the points of diagnosis already 
discussed. But in‘ the Ka-gwr-pw plant to which special 
calyx character breaks down—the plant has a glandular calyx— 
and perhaps others of these characters are not so definitely 
Separating as at first seemed to be the case. Further explora- 
tion bringing more specimens will decide. Meanwhile having 
Siven as I hope a reasoned interpretation of all the facts in 
the case I have decided to follow Forrest in taking Rh. Forrestist 
comparison with the description of Rh. repens, a fuller account 
of Rh. Forrestii than has been possible hitherto owing to lack 
of material : 
