Appearance
"Petrosedum forsterianum" has two types of shoots: creeping, non-flowering ones that take root as they spread, and upright, flowering stems. The non-flowering shoots have tightly packed, scale-like leaves clustered at their tips, giving them a cone-like appearance. These leaves are linear in shape, slightly rounded or somewhat flattened, with a small spur at the base. They are typically green or bluish-green, measuring 10–15 mm, and remain on the plant even after dying, turning brown over time. The British population is distinguished by a compact and slow-growing rather than creeping habit, whereas the North African plants have distinctly bluish-purple foliage. The species is evergreen.When in bloom, the flowering stems of "Petrosedum forsterianum" stand upright, reaching 10–40 cm. The flowers are arranged in branching clusters, with each branch curving downward while in bud before straightening as they open. The flowers usually have five to seven, sometimes up to nine, bright yellow petals that spread outward. The sepals, small leaf-like structures at the flower's base, are triangular with a pointed tip and grow up to 3 mm long. The stamens, which produce pollen, are also yellow. The peak of the flowering season is in early summer. The plant produces upright seed capsules that are pale brown with distinct ridges.
"Petrosedum forsterianum" has a variable chromosome count. A cristate form may be produced, but is much rarer than in "P. rupestre".
Distribution
The natural range of "Petrosedum forsterianum" includes England, Wales, Ireland, France, Germany, Spain, and Portugal, as well as Morocco. It thrives in rocky habitats, forming dense, low-growing mats. It is often found in the shaded edges of glades. It is common in the shade of shrubs, which initially serve as nurse plants and then provide partial shade for mature specimens.References:
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