The Yellow Whitlowgrass (Draba aizoides) was in flower on Pennard Castle yesterday. For those who don't already know, the South Gower cliffs are the only place this mediterranean-montane species is found in Britain and the castle is by far the easiest place to see it. A couple of hoverfly bee-mimics Eristalis pertinax were noted feeding on/pollinating the plants.
The commonest associate of the Yellow Whitlowgrass was the mediterranean-altlantic moss Neat Crisp-moss (Tortella nitida), a cushion-forming species noted all over the castle, shown here growing on mortar. Note the small plat of Yellow Whitlowgrass top right, not quite in flower. For close ups of this rather fragile-leaved moss see http://moonmoths.blogspot.com/2011/02/mosses-on-pennard-castle.html