BURNET ROSE : DOWNY ROSE, ETC. 173 



Rosa pimpinellifolia, L. Burnet Rose. A small 

 bushy shrub, usually in sandy soil, near the sea. There 

 may be a few glandular hairs on the shoots intermingled 

 with the setaceous prickles. The leaflets usually rela- 

 tively broad and occasionally bi-serrate. Several varieties 

 occur, differing in pubescence, glands, &c. Venation as in 

 R. canina. Purple brown in autumn. 



l~l l~~l Leaflets 5 7, greyish and downy, ob- 

 long or elliptical, bi-serrate. Prickles 

 equal. 



Rosa villosa, L. Downy Rose. Large bush with 

 arching branches, and leaves hairy on both sides. The 

 prickles are more equal than in R. pimpinellifolia, the 

 leaflets larger and more bi-serrate, and the lower surface 

 may be tomentose. But here again the pubescence and 

 glands, serration and prickles vary much. Venation as in 

 R. canina. Purple brown in autumn. 



* Shoots and foliage devoid of prickles or 

 spines ; stipules free and deciduous ; leaf- 

 lets numerous, about 11 19, oblong- 

 acute, serrate, base entire. 



t Leaflets sharply serrate nearly the whole 

 way up. Buds black and grey pubescent. 

 Stipules linear and caducous. 



Pyrus Aucuparia, Gaertn. Mountain Ash, Rowan 

 (Fig. 41). Medium-sized tree, with velvety black and grey 

 buds, and long pinnate leaves, 15 25 cm. Leaflets 11 

 19, laterals sessile, the terminal on a distinct stalk, 3 

 6 x 1 1'5 cm., lanceolate, narrow oblong, or linear- 

 oblong; sub-acute, serrate or bi-serrate, except at the 

 extreme base, glabrous and somewhat shining dark green 

 above, glaucous or slightly pubescent beneath, or hairy on 



