There are two "common" pearlworts in the Ben lawers Corrie and they are quite similar at first glance. This one is a hybrid between Sagina procumbens (Procumbent Pearlwort) which is an extremely common lowland weed of paths and gardens and Sagina saginoides (Alpine Pearlwort) which also grows in the Corrie. I haven't seen the lowland plant ever in this upland Corrie.
The difference between the two is that the Scottish Pearlwort (S. x normaniana) roots at the nodes and checking this one plus a few others around it showed they all were firmly rooted at nodes. The white flowers are the Pearlwort in the photo.
Ben Lawers Corrie 11th July 2005
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Added on 12th July 2005