148 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
(the usual number in leaves of average size), they are commonly close to 
each other, near or below the middle of the leaf-stalk ; if three, the third 
is higher up; if four, they may appear in pairs, one pair being as above 
described, and the other close to the base of the leaf-blade ; or, finally, 
they may all be at different points on the petiole. 
In M.W. (fig. 54) the leaf-stalks are slightly channelled along the 
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Fic. 53.—P. Buonapartrea. Fic. 54.—P. Marcarer Wuiuson. Fie. 55.—P. caRULEA. 
LEAF-STALKS (nat. size). 
upper side, and rounded on the under side. In large leaves they may 
reach the length of 25 in.; a common length is 15 in. The colour is 
commonly dull pmk. Four glands are present, usually very nearly oppo- 
site, in pairs, one pair being placed close up to the base of the lamina, 
or ,', to } in. from it, and the other pair either at. the middle of the 
petiole or a little above or beneath it. The glands are light green, with 
relatively stout stalks of a darker colour or deeper green. 
LEAF-BLADES. 
The leaf-blades of B. (fig. 56) are large, ovate-cordate, somewhat 
acuminate ; the upper side dark green, the under side lighter green, not 
glaucous; the margin entire. The largest example studied was 82 in. 
long and 7} in. broad. 
The leaf-blades of C. (fig. 58) are characteristically five-lobed, often 
seven-lobed by branching of the two lower lobes, occasionally ab- 
normally three-lobed, Examples 5 in. long and 7% in. wide have been 
noted. The upper surface is deep green, the under surface glaucous, the 
veins being often tinged with purple. Minute glands occur at notches on 
the margins, near the bases of the lobes. 
