718 ROSA. [CLASS XII. ORDER III. 



The erect not trailiug growth of the root shoots, and the short much 

 dilated base of the prickles, are the best characters by which this species 

 is distinguished from the following. The leaves are often when grown 

 in an exposed situation of a pink colour, as well as the prickles. The 

 habit of the plant is similar to R. canina, but the large elegant bunches 

 of its flowers are more delicate and beautiful. 



18. R. arven'sis, Huds, (Fig. 814.) Trailing Dog Rose. Prickles 

 unequal, hooked ; leaflets simply serrated, deciduous, glaucous beneath, 

 without glands; calyx segments slightly pinnated, deciduous; styles 

 united, smooth ; root shoots long, trailing. 



English Botany, t. 188. — English Flora, vol. ii, p. 397. — Hooker, 

 British Flora, ed. 3. vol. i, p. 244. — Lindley, Synopsis, p. 102. 



/S. Jlcxuosa. Shoots flexuous ; leaves ovate lanceolate, shining, 

 scarcely glaucous beneath. 



y. Hooker's British Flora, ed. 3. vol. i. p. 244. 



Root with creeping suckers. Shruh from three to four feet high, 

 with long slender trailing shoots, often numerously branched, the bark 

 a glaucous green, or a dull brownish purple. Prickles mostly of 

 unequal sizes, numerous, hooked, and but slightly dilated at the base, 

 scattered, less numerous on the branches, and often of a reddish colour. 

 Leaves with the common footstalk downy, sometimes glandular, and 

 having on the under side several slender hooked prickles. Stipules 

 pale, thin, narrow, linear, mostly downy at the back, reddish, and more 

 or less fringed with glands. Leaflets from five to seven, flat, ovate, 

 elliptical, or roundish, thin, dull green above, much paler and glaucous 

 beneath ; or as in /5. flexuosa they are a brighter green both on the 

 upper and under side, the margins coarsely, sometimes irregularly and 

 doubly serrated, smooth above, often downy, especially on the mid-rib 

 on the under side. Floiuers solitary on the lateral branches, numerous 

 on the shoots, in large handsome bunches. Bracteas lanceolate, often 

 serrated on the margin, and fringed with small glands. Peduncles 

 rather long, slender, rough, with almost sessile glands, often mixed 

 with a few setae. Calyx with an ovate purplish glaucous smooth tube, 

 the segments short, broad, ovate, with an acute point, entire, or with a 

 few short ^mr!«, smooth, or finely downy towards the margin, and on 

 the inside reflexed, falling away before the fruit is ripe. Petals obcor- 

 date, white, yellowish towards the base, at first concave, at length 

 spreading. Fruit ovate, spherical, or elliptical, smooth, of a fine 

 blood red, with an orange pulp, and a pleasant favour, crowned by the 

 thickened disk and persistent style. 



Habitat. — Woods, hedges, thickets, &c., common ; less frequent in 

 Scotland and Ireland. 



Shrub ; flowering in June and July. 



The variety iS. flexuosa appears to be a plant connecting it with 

 R. sempervirens in its general appearance, but that species has the 



