Sedum forsterianum is much less common than the other yellow-flowered stonecrop, sedum acre, and can be distinguished by its taller stems and longer, less cylindrical and more widely-spaced leaves.
Main flower color:
Native to Wales and southwest England, and introduced to other regions of the UK
Up to 20 cm
Well-drained, rocky places, often coastal, including grassland and waste ground
Yellow, with five petals, five carpels and ten stamens, produced in a dense, compact cluster, pendent in bud, otherwise erect. The hairless, light green calyx is divided nearly to the base into triangular lobes. Flowers are held at the tip of the relatively tall stems.
Short, fleshy, linear, D-shaped in cross-section (flat on top); at intervals along the flowering stems and more densely at the tip of non-flowering stems
June to August