KEY TO BKIT1SH KUBI. 885 



also weaker, has thin brown st., 1. with appressed white felt beneath 

 when young, pink fl., and reddish Btyles. All these variations 

 appear to be caused by conditions of station, and especially by the 

 chemical properties of the soil (poverty in lime and clay in the case 

 of R. saltuum)." 



R. Genevierii Bor. will probably have to be added to our Radul^ 

 list, as Dr. Focke has suggested that name for a plant which the 

 Rev. A. Ley finds abundantly at Clifford and Whitney, Ueref. (v. 

 B. E. C. Rep. 1887, p. 174). It is described in Genevier's Esmi as 

 well as in Boreau's Flora, and is placed by Focke between 11. 



echinatus and R. radnla. 



Group 7. Koehleriani ( = Hystrices Focke).— St. low-arching 

 or prostrate, rooting, clothed throughout with very unequal scattered 

 prickles, acicles, bristles, and stalked glands. Pan.-rachis generally 

 furnished with many stronger and weaker glandular bristles (i.e., 

 M acicles "and " bristles ") as connecting-links between the prickles 

 and the simple stalked glands ; lateral branches much as in the 

 Radulje, i.e., umbellate-racemose or cymose ; pet. of many species 

 of a vivid pink. In all our species, except cavatifolius and Bloxamii, 

 the stain, exceed the styles. Usually large strong plants, though 

 with low-arching or nearly prostrate st. 



Of this (as of the Egregii) Dr. Focke speaks as a " transition 

 group " ; and it certainly appears as if the earlier species in it 

 might be placed almost equally well among the Eadvlm, as in 

 their case the very mixed armature characteristic of the Koehleriani 

 is only found (if it can be said to be found at all) in the strongest 

 plants. 



A. Stalked glands and gland-tipped bristles on pan.-rachis and 

 ped., though very unequal, rarely if at all exceeding the hairs : 



(66) cavatifolius; (67) mutabilis ; (68) Bloxamii ; (70) adornatus ; 

 (71) obscurus. 



B. Stalked glands, gland-tipped acicles, and bristles on pan.- 

 rachis and ped. exceedingly unequal, often surpassing the hairs 

 and occasionally equalling some of the prickles :— (69) rosaceus and 

 vars.; (72) Koehleri and vars. ; ? A. or B. (73) badius? 



66. R. cavatifolius P. J. Muell. Journ. Rot. 1878 pp 144 

 145 ; 1886, p. 231 ; B. E. C. Rep. 1884, p. 102 ; 1885, p! ] 126.— St. 

 angular and sulcate, subylabrous, with rather few unequal mostly 

 small tubercular-based acicles and stalked glands. Prickles many 

 unequal, somewhat scattered, declining or occasionally deflexed 

 from compressed base, yellowish. L. 5-nate, often very large. Lts. 

 unequally rather doubly but acutely dentate-serrate, glabrous above,' 



pale yellowish green and hairy on the veins beneath ; term, very broadly 

 cordate-ovate, cuspidate-acuminate-attenuate, excluding the long point 



scarcely longer than broad; interm. and bas. very similar, but 

 narrower. Pan. long, lax, truncate, with many of the branches 

 (sometimes even the lowest) remarkably patent or divaricate, and 

 the term. ped. subsessile ; leafy below, and usually with many 

 simple 1. above narrowing gradually, towards the top of the rachis 



