20 
P. latifolia differs from P. eu-aria in having the leaves ultimately 
subcoriaceous, 5-to 9-veined, with the veins much less prominent 
beneath, the under surface at first with a very dense, greyish, cream- 
coloured tomentum below, and a less dense one above. The tomen- 
tum on the upper surface remains until the leaves have attained to 
about half their full size or more, and traces of it may even be found 
at the time the plant begins to flower. The tomentum on the under 
surface becomes much less dense than in P. eu-aria and rupicola, so 
that the colour of the leaf becomes of a greyish green and not white. 
Ultimately it becomes so thin that the substance of the leaf 
may be seen in places nearly denuded. The leaves vary 
greatly in breadth from subrotund -ovate to oval-oblong. They are 
always more or less lobed, though the lobes vary much in depth, the 
second lobe from the base being generally the most prominent, though 
occasionally the first equals if not exceeds it. These lobes are always 
deltoid or triangular in outline, more or less distinctly serrated, and 
each lobe terminates in a tooth larger and more accuminate and acute 
than the others. The extremes in British specimens lie between 
specimens sent from Symond’s Yatt, Gloucestershire, by Rev. Augus- 
tiu Ley, in which the leaves are nearly as broad as long, with large 
and very acute lobes, to the Leigh Wood plant, figured as P. scandica 
in “ E. B.,” ed. iii., p. 484, in which the leaves are only about half as 
broad as long and the lobes short and much blunter. Mr. Watson 
has sent me a leaf from the Nightingale Yalley, collected by Miss 
Atwood in 1852. This leaf certainly presents some approach to P. 
eu-aria, but I have a specimen from Miss Atwood, probably from the 
same tree, as it is labelled Nightingale Yalley, 1852, which has fewer 
veins and more deeply lobed margins, being in fact quite undis- 
tinguishable from Mr. T. B. Blower’s Leigh Wood specimens, whicli 
after all may be from the very same tree as Miss Atwood’s. Mr. T. 
R. Archer Briggs says of this, “ the odour of the flowers is very 
sickly and disagreeable in the Devonshire plant ” ; so in this it appears to 
agree with P. eu-aria , which it also resembles in the size and colour 
of the fruit. The broader the leaves of this plant, the more 
the lobes point outwards ; in the narrower forms they point 
towards the apex of the leaf. Garcke in his “Elora of North and 
Middle Deutchland ” describes P. latifolia under the name of P . 
Aria-torminalis . Certainly in the texture of the leaves and the 
character of their pubescence when young there is a departure from 
P. Aria in the direction of torminalis, and in the broader-leaved 
specimens the form of the leaf and of the lobes approaches that 
species, and were P. latifolia not so abundant the most probable 
