Saxifraga.] SAXIFRAGEA. 105 
roundish or slightly oblong leaves more or less erect, with 
almost flat tapering footstalks (Pl. VI., figs. 10-12, &c.). 
It occurs abundantly in many places, sometimes to the 
exclusion of almost every other form, and unlike the type 
shows a marked preference for lowland localities and the 
more sheltered situations among the mountains. All of 
these plants are most probably due to the hybridising of 
the type with S. Geum. 
The third form is the var. sERRATIFOLIA (Mackay), with 
long and rather narrow erect leaves and deep serrations. 
While not infrequent in sheltered rocky situations, well 
marked plants of this variety are decidedly less common 
than are either of the preceding forms. Some leaf examples 
are shown on Pl. VI., figs. 19-24. 
While the Pyrenean and Kerry forms of S. Geum do not 
appear to differ much from each other, a form of S. wmbrosa 
was gathered by the writer in the Pyrenees unlike any 
hitherto noticed by him in Kerry. This wmbrosa form (vide 
Pl. VL, fig. 27), has an oblong leaf with blunt crenations 
and a pronounced cartilaginous margin ; in all Kerry forms 
of this plant, however, the serrations are acute and the 
cartilaginous margin but poorly developed. Really blunt 
crenations if they occur at all in Kerry S. umbrosa must be 
very rare ; in fact, no native Kerry specimen has yet been 
seen by the writer, nor indeed any from Ireland, that fully 
answers the Linnean definition of this plant “‘foliis carti- 
lagineo-crenatis,”’ a description most probably drawn from 
a Pyrenean or Spanish specimen. 
Although S. umbrosa and S. Geum are strongly calcifuge, 
both these plants may occasionally be found growing on the 
limestone. They have been noticed, for instance, on rocks 
of this formation beside the Roughty River below Ardtully 
east of Kenmare and in Muckross demesne, &c. 
The distribution of S. wmbrosa in Ireland is much wider 
than that of S. Gewm, and there can be no doubt that it is 
a much hardier and more aggressive plant. Indeed S. Gewm 
in all its forms, appears to be practically confined to south 
Kerry and west Cork, whereas S. umbrosa is found on the 
mountains of Waterford, Tipperary and Cork in the south, 
and in Kerry, Galway, Mayo and Donegal on the west, in 
fact, along the entire western margin of Treland except 
where the presence of limestone formations fully accounts 
for its absence. On the continent also it appears to have 
a wider range than S. Geum. It is found in the Pyrenees, 
northern Spain and Portugal, and according to Willkomm 
