BALFOUR—NEW SPECIES OF RHODODENDRON. 135 
Rh. Mackenzianum belongs to a group of Rhododendrons 
characterised by straight yearly growths often of some length, 
the very glabrous leaves produced in a rosette at the end of 
each yearly growth persisting for two or more years and thus 
false whorls of leaves clothe the branches ; flowers produced 
in lateral trusses fascicled at the end of the shoots around a 
terminal vegetative bud; corolla with a narrow funnel-shaped 
base and a 5-lobed limb, the lobes usually half the length of 
the whole corolla; stamens with thin filaments; ovary long 
narrow ending in a long usually exserted style. Several species 
have been described which show more or less the characters 
named. They are :— 
Rh. Cavaleriet, Lévl. Kweichow : Pinfa. 
Rh, Chaffanjonii, Lévl. Kweichow : Kouy Yang. 
Rh, Esquiroliu, Lévl. Kweichow : Gan Chouen. 
Rh, Feddei, Lévl. Kweichow : Pinfa. 
Rh, Hancockii, Hemsl. S. Yunnan: Mengtsz. 
Rh. Henryi, Hance. Kwantung: North River. 
Rh, Latoucheae, Franch. Fokien: Kuatun. 
Rh. Mackenzianum, ee Forrest. W. Yunnan, N.E. ih ey Burma. 
Rh. moulmeinense, Lower Burma : Moulmei 
Rh, eine Balf “f et W.W. W. Yunnan: Hills N. of Teng- 
yueh. 
Rh. aden, Franch. S. Yunnan: between Muongle and 
eu-ma-tsi. 
Rh. pittosporaefolium, Hemsl. W. Hupeh : desi district. 
h. stamense, Diels. ek et Ba 
Rh. stamineum, Franch. EB. Vicia ig rer -fong-chan. 
Rh, stenaulum, Ball. f. et W. W. W. Yunnan: Divide between Pu- 
Sm piao and Yung Chang valleys. 
Rh. T utcherae, Hemsl. et Wils. S. Yunnan: Mengtsz. 
Rh, Westlandii, Hemsl. Kwantung: Lantao Island. 
Rh. Wilsonae, Hemsl. et Wils. Hupeh. 
There will be several new species to add to this list when the 
material collected by Forrest and others has been fully worked 
up. I hope to be able soon to publish an account of the group, 
when the limitations and relationships of the species will be 
discussed. 
No one of the members of this group is likely to be a hardy 
species. It is essentially one of Central and South China, of 
N.E. Upper Burma, and of S. Burma. Rh. Mackenzianum is 
one of the most beautiful and is allied to Rh. stenaulum, but 
distinguishable by its bright green very glossy foliage, the 
narrower leaves with long acuminate points, the shorter pedicels 
and larger flowers. In the Gardeners’ Chronicle, Ser. 3, Ixv. 
(r919), 302, Mr. Farrer describes and figures the plant under 
his field number 8or. 
