lady's cushion
/ˌleɪdɪz ˈkʊʃn/(also ladies cushion, ladies' cushion) Now rare
noun
1 English regional (chiefly south-western ). Thrift, Armeria maritima.
2 English regional. Any of several saxifrages (family Saxifragaceae); especially mossy saxifrage, Saxifraga hypnoides.
Origin
Mid 17th century; earliest use found in Robert Lovell (?1630–1690), naturalist. From the genitive of lady + cushion, although the first element is sometimes apprehended as plural; so called on account of the plants' habit of growing in thick tufts or clumps.