A NEW BRITISH RUBUS 311 



organs of its showy though more frequently barren panicle. 

 Purchasianus also looks considerably different from glareosus, 

 because of its roundish stem with very crowded nearly patent 

 stout prickles, leaves mostly 5-nate with more uniform outline and 

 toothing, and narrow racemose-cylindrical panicle, with remark- 

 ably shaggy rachis, pedicels, and sepals, and very hairy carpels. 



A short tabular key may make the arrangement which I pro- 

 pose for these plants plainer : — 



A. Suh-Bellardiani. 



Gland-tipped organs short (on panicle especially), almost wholly 



sunken. 



(1) The large prickles subequal, chiefly confined to angular 

 stem. 



B. pallidics Wh. & N. Leaves mostly 5-nate. Leaflets ovate- 

 acuminate, cordate, with coarse irregular serration. Panicle fairly 

 leafy above, with wavy rachis and slender branches. Petals 

 normally white. Carpels glabrous. Widely but thinly distributed 

 in England and Wales. 



R. glareosus, sp. nov. Leaves chiefly 3-4-nate. Leaflets 

 narrow, obovate-cuneate with compound serration in the upper 

 half. Ultra-axillary panicle lax. Petals very narrow, pink. Car- 

 pels somewhat hairy. North Hants, West Sussex, West Kent, 

 West Surrey, Oxford. 



(2) Prickles mostly short, unequal, scattered on roundish stem. 

 B. rosaceus Wh. & N. Leaves chiefly 8-4-nate. Leaflets 



broad, roundish, cordate. Panicle leafy almost to the top. 

 Petals broadly obovate or roundish, pink. Carpels glabrous. 

 W. Cornw. to Cumb., with few exceptions ; Leic, Derb., and 

 Yorks. M. Perth. 



B. Purchasianus Eogers. Leaves chiefly 5-nate. Leaflets 

 rather narrow, obovate-oval. Panicle racemose-cylindrical. Petals 

 narrow, pink. Carpels densely hairy. W. Glos., Monm., Heref., 

 Wore. Perhaps a few counties in the north. 



B. Koehleriani. 



Gland-tipped organs very numerous, of all lengths and all kinds, 



often far exceeding hairs. 



B. hystrix Wh. & N. Stem angular, strongly clothed with 

 very mixed arms. Leaflets obovate-acuminate, thinly pubescent 

 beneath, with distant incised dentate serration. Petals narrow. 

 Fruit abundant. Widely spread in England and Wales. Wigt., 

 Perth. 



forma bercheriensis. Leaflets nearly oval, with closer, less 

 dentate serration. Berks. 



B. infecundus Eogers. Stem bluntly angled, with fewer inter- 

 mediate arms. Leaflets nearly oval, yellowish, thick, softly hairy 

 beneath, with teeth mostly shallow, though large and nearly 

 patent. Petals soon fading. Fruit often imperfect. W. Cornw. 

 to Lanes. ; Sussex to Derbs. ; Western., Dunb. Though near to 

 hystrix, this keeps remarkably distinct. 



