78 



ON POTENTILLA. REPTANS AND ITS ALLIES. 



Polygonum minus Huds. k. 

 Neottia Nidus- avis Rich. 



Carex dioica Linn. 

 G. teretiuscula Good. 



Epipactis palustris Crantz. k. G. acuta Linn. 



Orchis pyramidalis Linn. 

 Allium Scorodoprasum Linn. 

 Juncus obtusiflorus Ehrh. 



Willd 



K. 



Sparganium aflSne Schnizl. 

 Lemna trisulca Linn. k. 

 Potamogeton polygonifolius, 



var. pseudo-fluitans Syme. 

 „ linearis Syme. 

 P. nitens Web. 



Zostera nana Roth. i. 

 Naias flexilis Rostk. 

 Eleocharis acicularis Sm. i. 



Scirpus rufus Wahlb. 



Bynehospora fusca R and S. 



K. 



C. limosa Linn. 

 G. pallescens Linn. 

 G. pendula Huds. 

 C. strigosa Huds. i. 

 C. filiformis Linn. 

 C. riparia Curtis, k. 

 Milium effusum Linn. 

 Phleum arenarium Linn. 

 Lastrsea Thelypteris Presl. 

 Equisetum hyemale Linn. 



Linn 



Isoetes echinospora Dur. 

 Chara fragilis v. capillacca Coss 



and G. 



Nitella translucens Agardh. 



ON POT ESTILL A REPTANS AND ITS ALLIES. 



By W. H. Beeby, A.L.S. 



Last winter Herr Svante Murbeck, of the Botanical Museum, 

 Lund., who has studied the various forms of Potent ilia which are 

 intermediate to P. rej)tansL. f P.procumbens Sibth., and P. Tor- 

 mentilla Sibth., asked me to send him as large a series as possible 

 of the British forms, in the expectation that he might find among 

 them, besides P. mixta Nolte, possibly P. suberecta Zimm. and P. 

 Gremlii Zimm. Accordingly I forwarded the whole of my collection, 

 together with a number of examples from the herbaria of Messrs. 

 Arthur Bennett, Alfred Fryer, W. F. Miller, and Rev. E. S. 

 Marshall. The result was that various examples were identified by 

 Herr Murbeck as P. suberecta, but P. Gremlii was not detected. 



Among the plants lent by Mr. Bennett was one from a number 

 of specimens sent out as u Tormentilla reptans? " by Watson through 

 Bot. Soc. Lond. in 1849 ; these were cultivated specimens from a 

 root originally collected at Ockshott, Surrey. In the < Phytologist ' 

 (1849, p. 485) Mr. Watson expresses himself with considerable 



tli 



r 



determined 



Murbeck as P. suberecta; and I may say that of my own examples 

 so identified several had been referred by me to P. procumbent with 

 doubt ; it seems therefore that there is room for the name. The 

 P. suberecta is generally accepted as a hybrid P. TormentilUt X pro- 

 cumbens ; while P. Gremlii is considered a hybrid P. reptans X Tor- 

 mentilla. If the latter be really a hybrid, it should be found in 

 Britain, as its two supposed parents are both of them much more 

 common than P. procumbens, one of the parents of P. suberecta. 



