found: Work cat.: Roper, P. Chequer, 2004:p. facing t.p. verso (the chequer or wild service tree, Sorbus torminalis) text ("Chequer" is the local name for the tree in South East England; "Wild Service" is the generally accepted English name)
found: Wikipedia, 7 Sept. 2010:under Sorbus torminalis (Sorbus torminalis, syn. Torminalis clusii, Wild Service Tree, sometimes known as the Chequer(s) Tree or Checker(s) Tree, is a species of Sorbus native to Europe, northwest Africa, and southwest Asia)
found: Botanical Soc. of the Britsh Isles website, 7 Sept. 2010:species (Sorbus torminalis, Wild Service-tree; an obsolete name is the Chequers Tree)
found: Habitat Aid website, 7 Sept. 2010:catalogue (Wild Service Tree, Sorbus torminalis; distinct from the Service Tree, Sorbus domesticus; the Wild Service Tree, also known as the "Chequer Tree", is now one of our rarest native trees)
found: USDA NRCS Plants Database, 7 Sept. 2010(Sorbus torminalis, checkertree)
notfound: ITIS