128 



Orobanche (parasitical on ivy, but having had very little practical 

 experience in the genus, I have not determined the species ; perhaps 

 the specimens, collected in a late state, belong to O. Hederae), Pim- 

 pinella magna, Poteriura Sanguisorba, Rubia peregrina, Saxifraga tri- 

 dactylites, the rayless Senecio Jacobsea, also the Sagina stricta, Fries, 

 and Polygonum Raii, which I have already recorded, and which were 

 kindly examined and confirmed by C. C. Babington. Sagina mari- 

 tima is mentioned by Andrews, and is perhaps the same plant. The 

 great Isle of Arran is a most interesting spot, and well worthy of a 

 special visit. We returned home by way of Dublin, taking an oppor- 

 tunity of visiting the Portmarnock and Baldoyle district, where we 

 found several species, as Erigeron acris, Erythraea littoralis.^ Gera- 

 nium pyrenaicum, Reseda fruticulosa or alba (apparently wild), Sta- 

 tice rariflora, Ruppia (perhaps rostellata), and several others. I may 

 add, that if any of the Roundstone or Arran plants which are here 

 recorded as new have been given in either of the lists before men- 

 tioned, it is an oversight for which I am to blame. By the way, any 

 future botanist travelling in our district would do well to be provided 

 with a good siphon barometer, or some other means of approximately 

 ascertaining altitudes ; it is very desirable that such observations 

 should be made more generally in connexion with the occurrence of 

 species. Daniel Oliver, jun. 



Newcastle-upon-Tyne, March 18, 1851. 



Potamogeion prcBlovgus, Sfc, at Siaffoi'd. 

 By the Rev. R. C. Douglas, M.A. 



PoTAMOGETON PR^LONGDS, Wtilf., has not, I think, been announced 

 as a plant of this county. It occurs at Stafford in the river Sow, a 

 very sluggish and dirty stream, growing in great abundance, in com- 

 pany with P. zostera^folius, Schum., and a species of the pectinatus 

 division, whose flowers are produced so sparingly that I have not been 

 able to gather it in a fit state for acccurately determining its name. 

 Babington gives June as the flowering month for proclongus and zos- 

 teraBfolius ; Hooker and Arnott say July. It may therefore be worth 

 mentioning that last summer I noticed them growing as stated above, 

 in the same stream and under exactly the same circumstances, and 

 found prffilongus flowering in June, but zosteraefolius not before July. 



R. C. Douglas. 



StaflFord, March 25, 1851. 



