ICOSANDRIA— POLYGYNIA. Rosa. 393 



17. R. dufneiorum. Thicket Rose. 



Fi'uit elliptical, smooth, as tall as the bracteas. Flower- 

 stalks aggregate, slightly hairy. Calyx copiously pin- 

 nate, somewhat cut. Prickles numerously scattered, 

 hooked. Leaflets simply serrated, hairy on both sides. 



R. dumetorum. Woods Tr. of L. Soc. v. 12. 2 1 7. " Thuill. Paris. 

 250," according to Mr. Woods. 



In hedges in the southern counties occasionally ; seldom in any 

 abundance. Woods, 



Shrub. June. 



From 4 to 6 feet high, with many weak spreading branches. 

 Prickles rather plentiful, and for the most part irregularly scat- 

 tered, often in pairs under the footstalks, strongly hooked, 

 broad at the base. Leajlets much smaller than in the last, of a 

 grass green and rather shining, elliptic-ovate, acute, with simple, 

 uniform, scarcely ever divided serratures, finely hairy, more or 

 less, on both sides ; the mid -rib very hairy, sometimes prickly, 

 beneath. Footstalks hairy and prickly. Stipulas narrow, ser- 

 rated. Bracteas serrated, pointed, often leafy and jagged, 

 longer than the Jiower-stalks, which are short and stout, com- 

 monly 2 or 3 together, smooth, or a little hairy. Tube of the 

 cahjx roundish or elliptical ; segments of the limb rather co- 

 piously pinnate, with long, entire or toothed, leaflets. Petals 

 reddish. Styles prominent, a little hairy. Stigmas forming a 

 round hairy head. Fruit red, ovate, or nearly globular. 



18. R. Forsteri. Downy-ribbed Dog Rose. 



Fruit elliptical, smooth, like the aggregate flower-stalks. 

 Calyx copiously, and somewhat doubly, pinnate. Prickles 

 scattered, conical, hooked. Leaflets simply serrated ; 

 smooth above ; ribs hairy beneath. 



R. collina /3 and y. Woods Tr. of L. Soc. v. 12.219. 



In hedges. 



Shrub. June, July. 



Stem 6 or S feet high, with spreading, sometimes weak, branches. 

 Prickles either in couples under the leaves and young branches, 

 or solitary and dispersed, conical at the base, hooked, not de- 

 flexcd ; sometimes very small with a broad base. Lettflets .5 or 

 7, elliptical, acute, sharply and unequally, but never doubly, 

 serrated, nor glandular, though the tips of the serratures are 

 brown and cartilaginous ; upper surface of a rather glaucous 

 green, either opaque or shining, quite smooth ; under paler, the 

 mid-rib especially very hairy. Footstalks hairy or downy, prickly, 

 as well as obscurely glandular. Stipulas oblong, pointed, fringed 

 in tlie upper part with glands j a little hairy externally j the 



