74 E. A. PRYOR — BOTANICAL WORK OF THE PAST SEASON. 



future they will be not readily distinguishable from the real con- 

 stituents of the flora. Thus a record of their present occurrence 

 as casuals will be hereafter available towards clearing up this 

 obscurity. 



Carduus tenuiflorus, Curt. (C pycnocephalus, Jacq., of Hooker's 

 ' Student's Flora '). In profusion and perfectly established at Box- 

 moor, extending for some distance by the roadside, and on ditch- 

 banks in many places, having quite the air of an indigenous 

 plant. Strangely enough, however, it is quite absent from the 

 railway embankment, and its introduction is apparently owing to 

 the traffic on the Grand Junction Canal. 



Mentha citrata, Ehrh., has been noticed at I^orthaw, growing 

 abundantly in and about a pond on the village green. This seems 

 to be very rare in England in a quasi-wild state, and is not, I 

 believe, common in cultivation ; at least, I have never so seen it 

 myself. It is a distinct-looking plant, with a strong odour of 

 bergamot, very different from the scent of any other mint.* 



It would take up too much time were I to go through the sub- 

 species and varieties enumerated in the paper that I had the honour 

 to read to you during our last session ; but I may mention that 

 I have been able to strike off" from the roll of possibly extinct 

 plants given in the second part of that paper the following species, 

 most of which I have seen myself in a growing state : where this 

 has not been the case, I am indebted for fresh specimens to the 

 kindness of several correspondents, including some of our own 

 members. 



Ranunculus hirsutus, Curt. Limosella aqicatica, L. 



Dentaria bulbifera, L. Scutellaria minor, L. 



Teesdalia nudicaulis, R.Br. Myosotis repens, Don. 



Stellaria glauca, With. Pinguicula vulgaris, L. 



Astragalus hypogloltis, L. Anagallis tenella, L. 



)> glycijphyllus, L. Folygonum minus, Huds. 



Potentilla Comarum, Nestl. Thesium humifusum, DC. 



Geum rivale, L. Potamogeton rufescens, Schrad. 

 Sedum dasyphyllum, L. „ obtusifolius, Koch. 



Smyrniuin Olusatrum, L. Juncus diffusus, Hoppe. 



Valerianella Auricula, DC. Ekocharis acicularis, 11. Br. 



Filago gallica, L. Scirpus sylvaticus, L. 



Senecio eampestris, DC. Carex acuta, L. 



Gentiana eampestris, L. Aira Jiexuosa, L. 



Myriophyllum alterniflorum, DC, was inserted in the list of 

 doubtful plants on account of its having been queried in 'Topo- 

 graphical Botany.' I have observed it this year in many of the 

 localities assigned to it in the 'Flora Hertf ordiensis, ' and there can 

 be no doubt that the name was correctly given. 



So much for the county at large. 



"With regard to our own district, as limited above, the follow- 



* This is, however, in all probjil)ility " M. Aqwitica y. glahrata, Kocli," of 

 Fl. Ilts. p. 220, if the spcf^inieu was correctly referred to Koch's phiut. Cf. 

 ' Synops. Flo. Germ.' p. 350 (ed. i.). 



