ROSACEA. 



26? 



B. dumctorum, t. 2579 and Suppl. t. 2610, B. Forsteri, Suppl. t. 2G11, 

 and probably also B. tomentosa, t. 990, appear to be all reducible to 

 the dog B. 



5. Field Rose. Rosa arvensis, Linn. (Fig. 827.) 



(Eng. Bot. t. 188.) 



A mucb more trailing plant than the 

 dog B., often extending to many feet, 

 with slender branches. Foliage and 

 prickles nearly as in that species, but 

 the leaflets are usually more glabrous 

 and shining on the upper side, rarely 

 slightly downy. Prickles usually small, 

 and much hooked. Flowers white and 

 scentless, usually 3 or 4 together at the 

 ends of the branches, rarely solitary. 

 Fruit globular or nearly so, without 

 bristles ; the calyx-divisions mostly en- 

 tire, and falling off before the fruit is 

 ripe. Styles usually united in a column 

 protruding from the orifice of the calyx- 

 tube, and the carpels all quite sessile, 

 but neither of these characters appear 

 to be quite constant. 



In hedges and thickets with the dog B., in western and central 

 Europe, and often as common, but not extending so far to the north, 

 nor apparently into eastern Europe. Abundant in England and Ire- 

 land, but becomes scarce in Scotland. Fl. summer, lasting much later 

 than the dog B. 



Fig. 327. 



XIY. PYRUS. PYRUS. 



Trees or shrubs, with entire or pinnately divided leaves, and showy 

 flowers, either proceeding, with a few leaves, from buds or spurs on a 

 former year's wood, or in simple or branched corymbs at the ends of 

 the year's shoots. Calyx-tube adhering to the ovary, the limb with 5 

 small divisions. Petals 5. Stamens numerous. Styles 5 or fewer. 

 Fruit forming with the calyx a fleshy mass, divided in the centre- into 

 5 or fewer cells of a leathery or cartilaginous consistence, each cell con- 

 taining one or two seeds oy pips. 



A genus of several species, widely spread over the northern hemi- 



