sandwort

(noun) loosely matted plant with moss-like foliage studded with tiny starry four-petaled white blossoms; mountains of central and southern Europe. Synonyms: Moehringia mucosa.

(noun) low-growing herb having clusters of small white four-petaled flowers. Synonyms: Moehringia lateriflora.

(noun) low-growing chiefly perennial plant usually with small white flowers suitable for e.g. rock gardens.