The Collaborative International Dictionary of English v.0.48:

mother-of-thousands \mother-of-thousands\ n.
   An East Asiatic saxifrage (Saxifraga stolonifera) with
   racemes of small red-and-white flowers; spreads by numerous
   creeping stolons; called also strawberry geranium and
   strawberry saxifrage.

   Syn: strawberry geranium, strawberry saxifrage, Saxifraga
        stolonifera, Saxifraga sarmentosam.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

mother-of-thousands
    n 1: eastern Asiatic saxifrage with racemes of small red-and-
         white flowers; spreads by numerous creeping stolons [syn:
         strawberry geranium, strawberry saxifrage, mother-of-
         thousands, Saxifraga stolonifera, Saxifraga
         sarmentosam]