j= oe 
Se Sh eee 
— 
ROSACE.E. 245 
coarsely serrated; veins 5 to 8 on each side, prominent beneath. 
Calyx-segments spreading in flower, erect in fruit. 
On exposed rocks, particularly those of limestone or trap. 
Sparingly but generally distributed. I have specimens from the 
counties of Devon, Derby (Matlock Bath), Carnarvon (Ormes Head), 
Durham (Holy Island), Yorkshire (Teesdale), Edinburgh (Queen’s 
Park), Sutherland, and from Sligo (Ben Bulben), Antrim (Glenarm). 
England, Scotland, Ireland. Shrub or Tree. Early Summer. 
Usually a bush 3 to 10 feet high, closely resembling P. eu- 
Aria, but with the leaves wedge-shaped towards the base and 
broadest beyond the middle, less deeeply lobed, and with a 
' greater portion at the base entire than in the P. eu-Aria; the 
upper surface becomes glabrous much sooner; the veins being 
more distant give the leaf a less ribbed appearance, as both in this 
and the preceding plant the veins are depressed on the upper and 
prominent on the lower surface. The partial corymbs which com- 
pose the general corymb are denser, the flowers a little larger, the 
calyx-segments not reflexed and rather narrower than in P. eu-Aria. 
The mature fruit I have never seen. 
I have had much hesitation in separating this from P. eu-Aria, 
but there appeared to me no possible medium between adopting this 
course or making P. Aria, P. scandica, and P. fennica mere varieties. 
All the four forms pass insensibly into each other, and yet the 
extreme forms of each are too far apart to suppose it possible that 
the one could be derived in a limited time from the other. I am 
indebted for fresh specimens of the Derbyshire plant, from which 
the accompanying plate has been made, to Mr. Joseph Whittaker, 
for the Irish to Professor Dickie, for the Edinburgh to Mr. John 
Sadler. The Teesdale specimen is from Mr. Baker, who kindly 
sent me leaves from the different forms of P. Aria, of which he 
possessed specimens. 
I regret that I cannot retain either Reichenbach’s or Fries’ 
specific name, in consequence of not separating the genera Pyrus 
and Sorbus: there is already a Pyrus oblongifolia of Spach and a 
Pyrus salicifolia of Linnzeus. 
Rock White-beam. 
Sus-Specres I1].—Pyrus scandica. Zab. 
Prats COCCLX XXIV. 
Bab. in Bot. Gaz. Vol. III. p. 35; and Man. Brit. Bot. ed. v. p. 118. 
Sorbus scandica, Mies. Nov. Fl. Suec. p. 138 ; Sum. Veg. Scand. pp. 42, 179. 
Crategus Aria, var. a, scandica, Zinn. Ameen. Ac. Vol. IL. p. 190. 
C. Aria, 3 Suecica, Zinn. Sp. Plant. p. 681. 
Pyrus intermedia, “Zhrh.” Lindley, Syn. Brit. Fl. p. 105. 
P. aria, var. y, Hook. & Arn. Brit. Fl. ed. viii. p. 141. 
