80 



development upon the lower mountain cliffs. Here the plant is twice the size of 

 its lowland form, and is smooth in all its parts. There is a complete series 

 joining the cliff form with that of the lowlands ; and the plant from the Black 

 Mountain Tarens stands about mid-way. This plant is not the ionn " montana 

 Willd" of the London Catalogue; for that is described as "dwarf and very 

 hairy," whereas this is large and quite smooth. 



14. Potentilla alpestris, Hall, fil. 1. Northern Group ; Clogwyn- 

 y-Garnedd, at 2,900 feet. I have never seen this beautiful Cinquefoil at any 

 other Welsh station; but it is given by Watson for " Montgomery " without a 

 question, and queried for '' Cardigan." I do not know any spot in these counties 

 where so alpine a plant is likely to occur. Is it an inhabitant of Craig Breidden, 

 along with its rare congener P. rupcstris ? It is not mentioned by Mr. Vize in his 

 list of Forden plants. Perhaps further investigation may lead to its discovery in 

 Brecon and Eadnorshire, since it does not appear to confine itself to the highest 

 cliffs. 



15. Pyrus rupicola, Syme. 7. Southern Group. This form of the 

 Whitebeam is the exclusive one upon mountains, and is especially a plant of 

 limestone hills and dales. It occurs at two stations on the Black Mountain 

 Tarens, viz., Cwm-y-oy, and on the northern slope of the Ffwddog ; but I have 

 never met with it upon the other cliffs included in this paper. Considering how 

 very conspicuous a tree the Whitebeam is, this seems to show that it is at least 

 very rare upon the cliflFs of Central and Northern Wales. Its presence on the 

 Black Mountain thus becomes interesting, as one of the limestone plants which 

 are found in that district. It is difficult to trace the distribution of P. rupicola in 

 Top. Bot. EdL; where it is combined by Mr. Watson with P. eu-aria. 



16. Sedum Rhodiola, B.C. 1, 2, 3, 5, 6. Northern, Central, and 

 Southern Groups. A frequent and characteristic cliff plant, abundant throughout 

 Northern and Central Wales, and recurring abundantly on the central crag of the 

 Brecon Beacons, which is its most southerly (?) station in Britain. Absent from 

 the lower cliffs, and from the Black Mountain Tarens : abundant northwards in 

 Lakeland, and Scotland. 



17. Saxifraga oppositifolia, L. 1, 2, 3, 5, 6. Northern, Central, 

 and Southern Groups. Common in Carnarvonshire, rare in Central Wales, 

 but recurring plentifully on the Brecon Beacon range. I have not seen this plant 

 in Merionethshire, but it is given by Watson for that county. This Saxifrage 

 is very abundant in Cwm Idwall, but hardly more so than in the Brecon Beacon, 

 where both at Craig Gledsiau and the central crag it clothes the rocks, early in 

 May, with its gorgeous robe of purple blossom. Abundant northwards in Lake- 

 land and the Scottish Highlands. 



18. Saxifraga nivalis, L. 1, 2. Clogwyn-y-Garnedd, at 3,000 feet 

 and higher : Cwm Idwall. Long known as an inhabitant of the first named cliff, 

 it is still to be found there (1886) ; but, it is to be feared, in quickly decreasing 

 abundance. Absent from the Central and Southern Groups ; present northward. 

 Sparingly scattered along the highest summits in the English Lakeland ; more 

 abundant in the Scottish Highlands. 



