394 THE BOOK OP ROSES. 



TWELFTH TRIBE OF SPECIES III. 



Rosa Trifoliata. 

 Rosa Lcemgata. 

 Rosa Sinica. 

 Rosa Hystrix. 

 Rosa Microcarpa. 

 Rosa Banksuz. 



SPECIFIC CHARACTERS. 



Shrub, climbing or creeping. 



Branches, slender, sarmentous, flagelliform ; green, 

 smooth, unarmed, or very slightly armed. 



Thorns, obliterated or slight, crooked, occasionally 

 straight. 



Stipules, detached in half their length ; subulated, 

 very narrow, deciduous in part or wholly, some- 

 times fringed with glands or hairs. 



Leafstalks, often naked, occasionally cottonous or 

 hairy ; armed underneath with small crooked 

 thorns. 



Leaves, glossy, having almost invariably three leaf- 

 lets. 



Lea/lets, oval-lanceolated, occasionally oblong or ob- 

 tuse ; simply toothed, without pubescence ; the 

 midrib sometimes hairy at the base. 



Flowers, usually numerous, in clusters; occasionally 

 solitary ; chiefly white. 



Flowerstalks, naked or bristly. 



Floral leaves, obliterated, or small and deciduous. 



Tube of calyx, hemispherical or oblong; smooth or 

 bristly. 



Sepals, entire, or almost entire ; usually oval, pointed, 

 often stiff; having sometimes bristles or slight 

 thorns on the edges. 



