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Perennial of the Brassicaceae family, found in the Iberian Peninsula, southern France, and northwestern Africa, on dry lawns, rocks, scrublands, and calcareous or siliceous screes, often at low and medium altitude.
Its epithet — with thyme-leaved — aptly describes its small oval to oblong leaves, reminiscent of wild thyme, densely covered with a grayish indumentum. It forms low and spreading tufts, semi-woody at the base, 10-20 cm. The flowers are yellow, small, grouped in short clusters in spring. Like A. murale , some populations of A. serpyllifolium have been identified as hyperaccumulators of heavy metals, particularly in connection with substrates naturally rich in nickel or zinc in the Iberian Peninsula.
In cultivation, it is suitable for dry and sunny rock gardens, well-drained substrates, calcareous or slightly acidic depending on the provenance.