NEW SPECIES AND COMBINATIONS IN THE GENUS RUBUS L. 



By W. C. R. Watson 



(The following descriptions of new Rubus species, etc. are taken verbatim from the 

 manuscript of a monograph on the genus in Britain by the late W. Watson, which is to 

 be published by the Cambridge University Press. The Publishers have kindly consented 

 to this separate publication, in order that the Watson nomenclature might be used in 

 the forthcoming British Plant List, which should then agree, both in content and order, 

 with the Monograph, The opportunity has also been taken to publish a number of 

 combinations, and to cite fully the synonymy). , p ^ g^^^ 



S. M. Walters. 



Rubus caesius L. 



var. grandis W. Wats., var. nov. 



Robustus. Differt foliolis magnis rugosis subtus dense pubescentibus, pstalis sepalisque 

 latis ovatis. Anglia. 



Holotype : Turpington Lane, Bickley, W. Kent, 4/8/1952, W. Watson, in Herb. 

 W. Watson. 



var. denticulatus W. Wats., var. nov. 

 Gracilis. Differt foliolis regulariter denticulatis. Surreia. 



Holotype : Gravel Road, Addington, Surrey, W. Watson, in Herb. W. Watson. 



var. pinnensis W. Wats., var. nov, 



Robustus. Differt foliolis argute profunde serratis, sublobatis, subcordatis, acuminatis. 

 Middlesexia. 



Holotype : Near the Pinn Brook, near Swakeleys, Uxbridge, Middlesex, W. Watson, 

 in Herb. W. Watson. 



Rubus bertramii G. Braun ex Focke 



var. minor (Boul.) W. Wats., comb. nov. 



R. hiformis var. minor Boul., 1900, in Rouy, Fl. France, 6, 40. 



Rubus arrheniiformis W. Wats., sp. nov. 



Radix repens propagulifera. Turio primo erectus demum arcuatus, parum ramosus, 

 angulatus rufus nitidus subglaber ; aculei tenues recti vel falcati flavescentes. Folia 

 parvula 5-foliolata ; petiolus leviter sulcatus, aculeis parvis armatus ; foliola remota, 

 supra glabrescentia, subtus pubescentia, subaequaliter serrata, terminale ovatum 

 lanceola'um deorsum contractum. Panicula i: longa subracemosa, ramuli ejus numero 

 ad 20 longi tenues, singuli 1-12 aculeis falcatis armati. Flores c. 1-75 cm. lati. Scpala 

 acuminata pubescentia virescentia, margine alba, post anthesin ascendentia. Petala 

 obovata apice modo Ruhi arrhenii lata rotundata, roseola, numero saepe ad 12. Stamina 

 alba stylos virescentes fere vel quidem aequantia. Germina semper fere glabra. Folio, 

 panicula, flore R. arrhenii referens. 



Holotype : Buxted Park, near Uckfield, E. Sussex, 24/7/1936, W. Watson, in Herb. 

 W. Watson. 



