32 HuTCHINSON—THE MADDENI SERIES OF RHODODENDRON. 
sunken, about their own diameter apart, with scarcely any 
membranous fringe; midrib impressed above, very prominent 
below, about 4 mm. wide at the base, gradually tapered to a 
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Fic. 4.—Rhododendron megacalyx, Balf. f. Nat. size. 
small rounded callous sunken apex, very slightly lepidote below ; 
lateral nerves about 15 on each side of the midrib, diverging 
from the midrib at an angle of 45°, very prominent below, 
straw-coloured, sparingly lepidote, branched and faintly looped 
