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THE PERFOLIATE PENKT-CRESS IN GREAT BRITAIN. 185 



figured the plant most admirably in the ' Proceedings of the Cottes- 



wold Club.' I believe either Professor Dyer or Professor Duthie 



also found it about a mile up the line westward, at Hayleigh AVood. 



On the 2nd of last May and several succeeding days I visited 



these localities on the Great AVestern Eailwav, and found the 



plant growing in abundance on the embankments, on the ballast 



heaps, and between tlie rails. I traced it westward, with breaks of 



never more than two or three hundred yards, from Tetbury-Eoad 



Station, through Hayleigh Wood, to the mouth of the shorter of 



the two railway-tunnels at Sapperton. Climbing up the cutting 



I found it again on the top and traced it to a waste-heap over the 



tunnel. This was the furthest westward extension I could find, 



and is one of the highest points in the neighbourhood, being, I 



believe, nearly 500 feet above mean sea-level. Ou my map of the 



county I have drawn the line of watershed between the Thames 



and the Severn only a few yards west of this point. 



I then returned to the Tetbury-Eoad Station and traced the 



Thiaspi eastward, beyond the station and viaduct, which marks 



the boundary of the county of Wilts, to a point just west of 



another archway, about halfway between Tetbury-Eoad and 



>- Kemble stations — that is, about half a mile over the county boun- 



dary. 



Though this is not much on which to add a new county to the 

 distribution of the species, it is about as much over the border as 

 the well-known sole locality for Carex tomentosa at Marston 

 Maisey ; and, as I have mentioned, Burford is only two miles from 

 Gloucestershire. 



I had a specimen alleged to have been found on the College 

 Farm at Cirencester, brought to me by one of the students ; and 

 Mr. S. P. Elton, of Cirencester, to whom I am indebted for much 

 botanical information, has a specimen which he believes is from 

 Baunton, rather more than a mile north-west of Cirencester. 

 Finally Professor Church believes he has seen the species growing 

 at Foss-bridge. If this last locality is confirmed it will be inter- 

 esting as uniting that of Burford with the Sapperton-Kemble 

 one, and as indicating that this calcareous waste-heap plant may 

 have spread along the ancient Ackman Street. 



The general distribution assigned to the species by Dr. Hooker 

 ^ay be, I suppose, expressed as the Old-world north temperate 

 zone ; but the term ^^rupestral" applied to its habitat by Mr. 

 Hewett Watson is far more nearly accurate than Dr. Hooker's 



