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Gheiranthus cheiri is found on most of the old castles 
and ruins in North Wales, and has evidently been there for 
a long time, being mentioned by various old writers. It is 
singular that it should so rarely be found on rocks, except 
in the immediate neighbourhood of some ruin. This would 
perhaps favour the idea that the species has been intro- 
duced at some very distant time. 
Thlaspi alpestre. This is very plentiful at Llanrwst, the 
walls and rocks in many parts, being white with its flowers, 
This is the subspecies occitanum of English Botany ; the 
other subspecies, sylvestre , I have not gathered, but from 
the examination of dried specimens of it from Teesdale and 
Clpva, I cannot see a good reason for any division of the 
species. 
Brassica oleracea. Found abundantly on the cliffs of 
the Great Ormes Head, and also on rocks in several places 
between Conway and Llandudno. It is of special interest 
as being the parent of the numerous varieties of cabbage^ 
cauliflower, and brocoli, and is, I think, truly indigenous in 
these localities, I can myself speak to its abundance on 
the Great Ormes Head thirty years ago, when Llandudno 
consisted of a very few fishermen’s cottages, and I am told 
it is mentioned as being there more than a hundred years 
ago. 
Helianthemum canum . This is one of the most conspi- 
cuous plants on the slopes of the Great Ormes Head, in the 
early part of May, covering the ground with a beautiful pale 
yellow ; about the last week in May it gives place to the 
other species, H. vulgare, the larger flowers of which make 
even a more beautiful show. 
Helianthemum guttatum. This occurs on Holyhead 
mountain. I had previously gathered specimens in seed, and 
visited the place in May to see it in flower. I was a little 
early and only met with a few flowers fully out, and as 
the petals fall at once when touched, it was not easy to 
