316 THE BOTANICAL EXCHANGE CLUB OF THE BRITISH ISLES. 



cuspidatis." — Gaudin. This is a common straggler from cultivation, as at 

 Piddington, Northants, 1874 ; Twyford, Berks, 1890 ; Beckley, Oxon, 

 etc. V. sativa L., var. cordifolia Beck. Tubney, Berks, 1913. 

 Dr Thellung has thus named the specimens. G. C. Druce. 



878 (3). Rubus nutkanus Mocmo ex Ser. in DC. Prod, ii., 

 566. Alien, N.W. Amer. Abundantly and completely naturalised 

 in Forfarshire, 1913, R. and M. Corstorphine, vide spec. This 

 handsome species, which is figured in the Bot. Mag. vol. 62. t. 3453, 

 1835, is named from the Nutka Sound in lat. 52, where it was 

 gathered by Mogino. 



878 (4). Rubus phaenicolasius Maxim, in Bull. Acad. Imp. 

 St. Petersb. viii., 393. Alien, Asia-Japan. In a hedge at Little 

 Dunmow, Essex, 1907, Rev. Andrew Clark, vide spec. It is figured 

 in Bot. Mag. vol. 106, t. 6479, 1880. 



888-908. Notes on the Genus Potentilla L. 



In the Bibliotheca Botanica (Stuttgart) xvi., 1908 appeared an 

 elaborate and very useful Monograph of the Genus Potentilla by my 

 valued correspondent and friend, Dr Theodor Wolf, in which he has 

 described 305 species. The Genus Sibbaldia L. is kept distinct and 

 not merged into Potentilla as is done by Bentham and Hooker in the 

 Genera Plantarum. The plants which have been reported for Britain 

 as native or as introduced species are arranged in the Monograph 

 as follows : — 



Grex. 1. Fruticosae. 

 P. fruticosa L. 



Grex. 5. Palustres. 

 P. palustris Scop, 

 var. villosa (Lehm.) 



Grex. 6. Tridentatae. 



*P. tridentata Sol. in Ait. 



Grex. 13. Fragariastra. 

 *P. alba L. 

 P. sterilis Garke. 



Grex. 14. Rupestres. 

 P. rupestris L. 



Grex. 19. Argenteae. 

 P. argentea L. 

 var. decumbens (Jord.) Focke. 

 var. tenuiloba (J ord. ) Sch warz. 

 var. dissecta Wallr. 



Grex. 21. Rectae. 

 *P. recta L. 



var. sulphurea Lam. & DC. 

 var. obscura (Willd.) Koch. 

 *P. hirta L. 



var. pedata (Willd.) Koch. 



