ROSACEAE 



373 



Stem often recurved and 

 rooting at the tip; leaflets 

 on floral branches usually 

 acuminate, incised toothed. 

 Stem rarely recurved and 

 rooting; leaflets on floral 

 branches merely acute, 

 with short broad teeth. 

 Leaves essentially glabrous beneath 

 or hairy only on the veins. 

 Stem erect or arching, but not 

 rooting at the tip. 

 Stem slender, less than I m. 

 high, almost herbaceous, 

 unarmed or with a few 

 bristle-like retrorse 

 prickles. 

 Flowers racemose, though 



few. 

 Flowers solitary or 2 or 3, 

 leafy bracted (erect 

 forms of). 

 Stem stout usually 1.5 m. 

 high, angled, unarmed or 

 with a few short stout 

 prickles. 

 Stems recurved and often rooting 

 at the tips (hybrids of Nos. 10, 

 12, 13, 14, 15, 16, 17 and 18 

 with Nos. 20, 21, 22, 23, 24 and 



25)- 

 2. Suckers and stems prostrate, only the floral 

 branches erect. 



Leaves decidedly pubescent beneath. 



Inflorescence conspicuously leafy-bracted 

 with unifoliolate broadly ovate or 

 cordate leaves. 

 Leaflets firm and light green, shining 



above, regularly toothed. 

 Leaflets thin, dark green above, 

 irregularly toothed. 

 Inflorescence not conspicuously leafy- 

 bracted; unifoliolate leaves rare, if any 

 cuneate at base. 

 Leaves glabrous or nearly so beneath, except 

 on the veins beneath. 

 Leaflets, at least those of the suckers 



coarsely and incisely dentate or lobed. 

 Leaflets more regularly serrate. 



Leaflets of floral branches sharply ser- 

 rate, with lanceolate teeth, firm at 

 least in age. 



15. R. recurvans. 



16. R. frondosus. 



17.* R. Randii. 

 25. R. Enslenii. 



18. R. canadensis. 



19. R. invisus. 



20. R. Baileyamts. 



21. R. plicatifolius. 



22. R. heterophil u\. 



