Synonyms for Sandwort (same or very similar meaning)
WordNet sense 1 (loosely matted plant with mosslike foliage studded with tiny starry four-petaled white blossoms; mountains of central and southern Europe):
Moehringia mucosaWordNet sense 2 (low-growing herb having clusters of small white four-petaled flowers):
Moehringia laterifloraFrom the ODE community, based on WordNetadd/edit