282 REPORT OF THF BOTANICAL EXCHANGE CLUB. 



always broadest beyond the middle, the lobes are smaller, and, as 

 well as the teeth, more acute, the terminal tooth into which the 

 main vein runs not much exceeding the others. The leaves have 

 much the same texture as in P. eu-aria, and at first are nearly as 

 pure white in colour, but ultimately have a much greyer tinge. 

 The tomentum is looser in texture below, and the arachnoid covering 

 disappears sooner from the upper surface, for though remaining till 

 the leaves attain their full size and the plant is in bud, yet I have 

 not seen any traces of it in specimens which have the flower fully 

 developed. The fruit is smaller than in P. eu-aria, f inch in 

 diameter, and the scarlet slightly inclining to carmine, which shade 

 of colour I have not seen in P. eu-aria. This plant seems to be 

 peculiar to limestone rocks, and may be but a rupestral form of 

 P. eu-aria. It will be observed, however, that Mr. C. Bailey, in 

 his note on its occurrence in Lancashire, speaks of its 

 being often found not only in stations where it must be regarded 

 as truly native, but also in plantations. From this I infer that it 

 occurs in the plantations still distinguishable from P. eu-aria, though 

 I regret much that some of these plantation forms have not come 

 under my notice. I believe P. rupicola to approach most nearly to 

 Sorhiis grmca, Lodd., which is placed by Boissier as a variety of 

 S. Aria. It differs from P. rupicola in the leaves being smaller, 

 more snowy white beneath than even those of P. Aria, and the 

 veins on each side varying from 5 to 8, but usually 6. Sometimes 

 the leaves of S. grceca are rather deeply lobed {i.e., the lobes about as 

 long as broad), deepest at or confined to the apex of the leaf central 

 tooth into which the vein runs not conspicuously larger than the 

 others. Of this group there are in Prof. Eeichenbach's collection 

 two examples named S. graca, and another which appears to be the 

 same thing, named " Sorhus Aria, var. ificisa. Rose," " Eriedersdorf 

 Col. Karl." Another specimen called *' Sorhus Aria, Sierra Nevada, 

 9000 feet, Hisp , Willkomm.," is intermediate between gr^Bca and 

 rupicola. A specimen in the same collection, labelled " Sorhus Aria ; 

 Krain," seems to me true rupicola. Another named Sorhus 

 oUongifolia, Reich., Fl. Germ., 2252, Krain, Dobrana, Fleischmann, 

 I believe to be also an abnormal form of rupicola, from its small 

 flowers and glabrous upper surface of leaves, though I almost agree 

 with Mr. Watson, who thinks it "as near Dr. Syme's Eeigate speci- 

 mens of P. eu-aria as to Mr. Whittaker's Buxton specimens of P. 

 rupicola.'^ ^^ Sorhus meridionalis,'" Guss., in Strobbi's "Flora 

 Nebrodensis," appears intermediate between P. grceca and P. eu-aria^ 

 but differs from both in having the central tooth of each lobe of the 

 leaf (that into which the side veins run) much larger and more 

 acuminate-acute than the others, as in P. latifolia, to which it also 

 approaches in the subcoriaceous texture of the leaves ; the veins are 

 from 6 to 10 in number; the margins of the leaves have minute 

 deltoid-acute lobes, deepest in the uppermost fourth of the leaf, and 

 the under surface of the leaf is snow-white. 



3. Pyrus latifolia. Whether or no we consider Pyrus rupicola 

 sufficiently distinct from P. eu-aria to require a separate specific name, 

 there is a very general feeling that the plant which I believe ought to 

 be called P. latifolia is something more than a variety of P. Aria. 



