Daboecia cantabrica (Huds.) K. Koch (W-Eur.) – An exceptional escape from cultivation or garden throw-out (or possibly deliberately planted initially?). Collected in a heath in Keerbergen (Kruisheide) in 2012 but apparently present since several years. In 2012 the small population counted ca. 10 young shrubs and seems rather well established. A genuine naturalization and spread, however, seem rather unlikely.
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Literature:
McClintock D. (1970) White-flowered Daboecia cantabrica. Irish Naturalists' J. 16: 391-392.
McClintock D. (1978) St. Dabeoc's heaths and their hybrids. Garden (London) 103. (3): 114-116.
McClintock D. (1982) A double form of Daboecia cantabrica. Heather Soc. Year Book 2(11): 32-33.
McClintock D. (1984) Daboecias with erect flowers. Year Book Heather Soc. 1984: 46-47.
Nelson E.C. (1982) Historical records of the Irish Ericaceae: additional notes on Arbutus unedo, Daboecia cantabrica, Erica erigena, E. mackaiana and Ledum palustre. Irish Nat. J. 20(9): 364-369.
Nelson E.C. (1984) Daboec - A saint and his heather. Year Book Heather Soc. 1984: 41-45.
Nelson E.C. (1996) Hybrids in St. Dabeoc's heath, Daboecia (Ericaceae): some nomenclatural adjustments. New Plantsman 3(2): 84-85.
Nelson E.C. (2000) A history, mainly nomenclatural, of St Daboec's Heath. Watsonia 23: 47-58.
O'Neill J. & Nelson E.C. (1995) Introduction of St. Daboec's heath into English gardens, 1763. Year Book Heather Soc. 1995: 27-32.
Ramil P., Aira M.J., Saá P. (1993) Clave polínica de las Ericaceae gallegas. Lazaroa 13: 33-40. [available online at: http://dialnet.unirioja.es/servlet/articulo?codigo=911361]
Scannell M.J.P. (1975) William Bowles and the introduction of Daboecia cantabrica to cultivation in Britain. Garden (London) 100(7): 318-319.
Scannell M.J.P. (1983) Erica erigena R. Ross and Daboecia cantabrica (Huds.) C. Koch.: some further notes on the historical records. Irish Nat. J. 21(1): 29-30.
Stelfox A.W. & Wood P.W. (1960) What is the origin of the heath Daboecia cantabrica var. praegerae? Irish Naturalists' J. 13: 121-122.
Woodell S.R.J. (1958) Daboecia cantabrica K. Koch (Biological Flora). J. Ecol. 46: 205-216.