WAV 
BALFOUR—NEW SPECIES OF RHODODENDRON, 89 
Species in sectionem Maddeni ponenda foliis subparvis, 
umbella pauciflora, pedicellis brevibus, calycis mediocris lobis 
elepidotis, corollae pallide roseae tubo brevi, staminum fila- 
mentis puberulis, stylo corolla longiore distinguenda. 
Bhutan. Punakka. Alt. 6000-7000 ft. 8 ft. bush on 
steep dry hillside with pink and scented flower. R. E. Cooper. 
No. 3936. 27th May roI5. 
Whether this plant may be the same as one of the forms of 
kh. Jenkinsii, Nutt. allied to Rh. Maddeni, Hook. f. named by 
Nuttall * from Bhutan I will not discuss. It is possible that 
one or more of these forms found by Booth may be distinct 
species, but the descriptions are altogether insufficient to enable 
one to say what Booth’s plants really were. Foliage alone in 
this series of rhododendrons is an unsafe guide to species unless 
leaf structure is examined microscopically—and neither the 
corolla nor stamens—critical characters in the series—of Rh. 
Jenkinsii and the forms included under it were known to Nuttall. 
Cooper’s plant here described is a distinct one in the Maddeni 
series. The most easily seen diagnostic mark is the small 
corolla with short tube a little over a centimeter long. From 
Rh. Maddeni and from Rh. calophylium, Nutt. it is dis- 
tinguished also by the larger calyx and by the puberulous not 
glabrous stamens, and then the leaves are obtuse and relatively 
to length much wider. Like Rh. manipurense, Balf. f. et Watt 
in its stamens it has a smaller calyx and corolla and the foliage 
also is much smaller. : 
Mr. Cooper collected his plant in May and obtained no fruit, 
so that this species is one that remains to be introduced to 
cultivation by some future explorer. 
Rhododendron callimorphum, Balf. f. et W. W. Sm. 
Frutex ad 3 m. altus plerumque pseudodichotome ramosus. 
Ramuli recti, annotini circ. 4 mm. diam. virides glandulis rubris 
crassis stipitatis obtecti, vetustiores grisel glandularum vestigiis 
verruculosi mox decorticantes. Alabastra ovoidea squamis 
fulvidis imbricatis obtecta. Folia petiolata ad 6.5 cm. longa ; 
lamina coriacea rotundata vel late elliptica circ. 5 cm. longa 
4 cm. lata apice corneo-mucronata margine cartilaginea basi 
cordulata vel subtruncatula lobis latis, supra atro-viridis nitida 
glabra sed vestigiis pilorum sebaceorum conspersa costa media 
venisque primariis utrinsecus ad 8 sulcatis, subtus glauca papillis 
ceriferis epidermicis petasiformibus obtecta et glandulis rubris 
Pluribus conspersa costa media suberubescente elevata venis 
Primariis et venarum reti intricato conspiculs haud elevatis ; 
petiolus circ, 1.5 cm. longus 2 mm. diam. subrubidus glandulis 
Be * Nuttall in Hook. Journ. Bot. v (1853), 361. 
