202 KEY TO BRITISH RUBI. 



Briggs thought that one of his Dev. " ramosus " forms might prove 

 to be R. macrostemon Focke. 



27. B. dueescens W. K. Linton, Journ. Bot. 1892, pp. 70, 71. 

 St. arcuate, angular, sometimes slightly sulcate, nearly glabrous, 

 subpruinose and shining. 'Prickles many, rather unequal, declining 

 from dilated and compressed base. L. exceptionally small, 5-nate- 

 pedate, coriaceous and subpersistent . Lts. rugose and plicate, glabrous 

 and dull brownish green above, hard and dull yellowish green beneath, 

 with a few short stiff hairs, and very prominent nerves terminating in 

 mucronate teeth (some of which are recurved); often imbricate; 

 term, ovate, acute, or somewhat acuminate, with cordate base, and 

 stalk armed with many falcate prickles, which often extend some 



way up the midrib. Pan. broadly cylindrical above, with patent and 

 divaricate interlacing cymose branches, and subsessile term, fl., and 



below a few distant patent or subpatent corymbose axillary branches; 

 rachis somewhat flexuose, with a good many very unequal hairs 

 and some felt above, and a few slender unequal strongly declining 

 prickles. Sep. ovate, with linear points. Pet. obovate, cuneate- 

 based, light pink. Stam. pink, longer than the green styles. 

 Derbyshire. 



A well-marked plant, from the exceptionally broad pan., and the 

 small, harsh, yellowish leaves. 



28. R. latifolius Bab. Joum. Bot. 1886, p. 219; 1887, p. 328. 

 St. arcuate-prostrate, angular, sulcate, nearly glabrous. Prickles 



small, slender, compressed, slightly declining from a very long 

 compressed base. L. 5-nate. Lts. very broad and large, thin, hairy 



on both sides, coarsely and doubly dentate, and almost lobate, the 

 teeth being acute, and all slightly directed forwards ; term, cordate- 

 acuminate ; bas. sessile, imbricate. Pan. short, leafy below, with 

 ascending few-flowered corymbose branches, its top and ped. felted 

 and hairy, with a few subsessile glands, and short, slender, declining, 

 yellow prickles. Sep. ovate-acuminate, greenish-felted. Pet. shortly 

 ovate, clawed, white. Stam. white, exceeding styles. Open woods 

 (E. Scotl.). 



We still seem much in the dark about this plant. Prof. Babing- 

 ton's own specimen ("Cramond Bridge, near Edinburgh, July 30, 

 1850") in the Borrer Herb., Kew, looks to me very corylifolian. 



Group 3. Discolores. — St. bearing equal strong prickles and 

 adpressed hairs. L. 5-nate, white-felted beneath. No stalked 

 glands. In our plants the sep. are grey and reflexed in fr., and 

 the stam. are longer than the styles. 



29. B. rusticanus Merc. R. discolor Bab. prius. — St. arcuate- 

 prostrate, strong, angular and furrowed, stellately downy and pruinose . 

 Prickles strongly declining from a very large dilated compressed base. 

 L. 5-nate-pedate and 3-nate, or 5-nate-digitate, rather small, sub- 

 persistent. Lts. obovate-cuspidate, coriaceous, convex, rugose above, 

 with very fine, close, white felt beneath. Pan. long, narrow, felted, 

 with prominent angles, and large-based strongly hooked prickles ; the few 



lower branches axillary. Sep. finely white-felted. Pet. usually bright 

 pink, or even purplish red, as are the styles, and sometimes the 



