802 DISCOVERY OF POTENTILLA NORVEGICA IN ENGLAND. 
lata, incluso petiolo 3—5-lineali. Amenta mascula 23—35$-pollicaria, in 
sicco quoad folia patulo-crecta, sed in planta vigente e ramulis graci- 
liter sed rigide dependentia. 
This species does not seem to agree with any of those described by 
Miquel. I suspect it is nearest his C. spherostachya, from which it 
seems only to be discriminated by the much longer J amenta and the 
cylindrical 9 ones. 
ON THE DISCOVERY OF POTENTILLA NORVEGICA, 
Linn., IN ENGLAND. 
By G. S. GissoN, Ese., F.L.S. 
On the 1st of July, 1868, I went, in company with some entomolo- . 
gical friends, to Wieken Fen, which is well kuown as a locality for 
Papilio Machaon, and which still abounds there. In walking across 
Burwell Fen, my attention was attracted to a plant which grew on 
the side of one of the marsh ditches, and appeared different from any 
species with which I was acquainted. Being in haste, I did not stay 
to search further; but, on examining the specimens after my return 
home, they appeared to me to agree with the description of Potentilla 
Norvegica. Subsequent comparison of them with those in the her- 
aria of Linneeus and Sir J. E. Smith confirmed me in the opinion 
that they belonged to that species, which was fully decided by seeing 
characteristic specimens of that plant in the Herbarium at Kew. 
have since again visited the spot, and, after careful search, discovered 
about twenty plants growing in the turf of the Fen-drove, or on the 
sides of the ditch; it did not extend far, but was scattered around 
some 30 to 50 feet. I did not notice it elsewhere in the Fen, but this 
is so extensive that it would be impossible to search it over in any 
moderate length of time. The plant is inconspicuous, and likely to 
passed over, except when in flower. Its geographical distribution 
renders it unlikely to be found native in the southern parts of Eng- 
land; but I cannot account for its introduction in so rough a spot, 
and it is not a plant that I have ever seen in cultivation. It appear 
quite at home, and at any rate must have been there for years. 
The following is a description of the plant :— 
Potentilla Norvegica, Linn. Sp. 715. Stem erect, upper portion di- 
