different between stonecrop vs hensandchicks

English

stone +? crop, from the apparent ability of the plant to grow out of bare rock and stone.

stonecrop (countable and uncountable, plural stonecrops)

Any of various succulent plants of the Crassulaceae family, native to temperate zones, especially in genus Sedum
- 1954, J. R. R. Tolkien, The Two Towers
  A trailing plant with flowers like small white stars had bound itself across the bows as if in reverence for the fallen king, and in the crevices of his stony hair yellow stonecrop gleamed.
Certain plants of genus Lithospermum, in family Boraginaceae.

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