Thymus serpyllum
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Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Thymus serpyllum' from the website Trees and Shrubs Online (treesandshrubsonline.
An evergreen subshrub a few inches high, with trailing, rooting stems, woody at the base; younger stems wiry, hairy all round. Leaves firm, elliptic or elliptic-ovate, mostly 1⁄8 to 3⁄8 in. long and about half as wide, blunt, narrowed at the base, hairy at least on the margin, sometimes on both surfaces, prominently veined beneath, dotted with oil glands. Flowering stems erect, bearing the rosy purple flowers in summer and early autumn in dense rounded heads 1⁄2 in. wide. Corolla scarcely 1⁄4 in. long.
Native of Europe, including Britain, where it is rare, however. Our common thyme is: