66 ROSACEA. 



S. A tree (30 feet) by the brook at the bottom of Bish- 

 port Wood ; no fruit in 1881. A tree (20 feet) on the 

 bank of a stream running through meadow-laud near 

 Woodspring Priory; full of fruit in 1881. IV. V. 



297. P. Malus, L. Crab Apple. 



Native; in hedges and woods, common. There are some 

 fine trees towards Dundry ; and in a wood by Stoke Park. 



V. 



298. P. Aucuparia, L. Mountain Ash. 

 Native ; in woods, rather rare. 



G. Wick Rocks. 



S. Clevedon. Leigh Woods, chiefly on rocks near the 

 Avon. Worlebury Wood. Yatton. V. VJ. 



299. P. Aria, Svi. White Beam. 



Native ; in woods and on limestone rocks, locally common, 



G. St. Vincent's Rocks and Durdham Down, Woods 

 above Wotton-under-Edge. 



S. Bourton Combe. Brean Down. Clevedon. Cheddar. 

 Leigh Woods, Sidcot. Yatton. On exposed rocks near 

 Winscombe, and elsewhere in the Mendips, where it is 

 sometimes seen in hedges. 



In successive years there is a very considerable difference 

 in tlie amount of blossom borne by the White Beams, 

 and thus their appearance at the period of flowering 

 alters greatly. In 1877 the trees on the summit of 

 Nightingale Valley flowered splendidly. In the three 

 following seasons there was scarcely a corymb to be 

 seen, and, indeed, in one of those year's it was only with 

 great difficulty that an herbarium specimen could be 

 found. But in 1881, when every tree flowered most 

 abundantly, Pyrus Aria excelled them all, and shone 

 forth once more in maximum beauty, the silvery foliage 



