43. R. C/Esius. 287 



c. ferox (Arrh.), nor the R. du7netorum 8 ferox of the Ruhi 

 Gerinanici. 



Intermediate forms between the varieties /e?'c>a; and tenuis 

 are not unfrt^qiient. 



7 ulmifolius ; caule tenui purpurascente, aculeis 

 crebris parvis deflexis declinatisve, aciculis setis pilis- 

 que paucis brevibus, foliolis rugulosis lobato-serratis 

 subtus in venis pilosis vel hirtis vel cinereo-subtomen- 

 tosis terminali rotundo-cordato acuminato ssepe triloho 

 vel rarissime in tribus foliolis sessilibus diviso cum 

 extimo ad basin attenuate. 



B. ulmifolius *'Presl. Del. Prag. 223"? (not Schott). 



R. ccesius y ulmifolius Bab. ! Man. ed. 5. 110; ed. 6. 119. 



R. ccesius /3 j^seudo-ccesius "VVeihe in Boenn. Prod. Fl, 

 Monast. 151. Pvubi Germ. 103. t. 4G. B. f. 1. Metsch in 

 Linnsea xxviii. 109. 



R, ccesius j3 ai^vensisW-allr. Sched. 228. DC. Prod. ii. 558. 



R. ccesius jS rugosus Lees ! in Steele 54. 



R. pseudo-c(Bsius Lej. Rev. de la Fl. de Spa. 101. 



R. Idceo-ccesius Wirtg. ! Herb. Paib. No. IIG (sp.). 



Stem slender but often thicker than in the preceding 

 varieties, ])urplish or purple, but also slightly glaucous, 

 round, with many small declining (or on the autumnal shoots 

 detlexed) prickles; hairs, setae and aciculi very few and short. 

 Leaves ternate. Leajlets thin, flexible, nearly flat, slightly 

 rugose, dull green and pilose above, hairy on the veins be- 

 neath (sometimes so densely as to seem felted), lobate- serrate; 

 basal ovate but very unequal-sided, or deeply bilobed, or 

 rarely the lobes sejDarate and form an oblong sessile basal 

 and a slightly stalked unequal-based broadly ovate interme- 

 diate leaflet; terminal longstalked, roundly cordate, shortly 



