White Rose-bay (Common name)

General Poisoning Notes:

White rose-bay (Rhododendron albiflorum) is a native shrub found in southwestern British Columbia. This plant is toxic to sheep, although rare cases of cattle poisoning may occur. The plant contains andromedotoxins (grayanotoxins) that can cause sickness and death after they are ingested by animals (Kingsbury 1964, Looman et al. 1983).

References:

  • Kingsbury, J. M. 1964. Poisonous plants of the United States and Canada. Prentice-Hall Inc., Englewood Cliffs, N.J., USA. 626 pp.
  • Looman, J., Majak, W., Smoliak, S. 1983. Stock-poisoning plants of western Canada. Agric. Can. Res. Branch Contrib. 1982-7E. 35 pp.

Nomenclature:

Scientific Name:
Rhododendron albiflorum Lam.
Vernacular name(s):
white rose-bay
Scientific family name:
Ericaceae
Vernacular family name:
heath

Go to ITIS*ca for more taxonomic information on: Rhododendron albiflorum

References:

  • Agriculture Quebec. 1975. Noms des maladies des plantes du Canada/ Names of plant diseases in Canada, Quebec City, Que., Canada. 288 pp.
  • Alex, J. F., Cayouette, R., Mulligan, G. A. 1980. Common and botanical names of weeds in Canada/Noms populaire et scientifiques des plantes nuisibles du Canada. Revised. Agric. Can. Publ., Ottawa, Ont., Canada. 132 pp.
  • Bailey, L. H., Bailey, E. Z. 1976. Hortus third. Revised. MacMillan, New York, N.Y., USA. 1290 pp.
  • Scoggan, H. J. 1978, 1979. The flora of Canada. Nat. Mus. Nat. Sci. (Ottawa) Publ. Bot. 7 (1)-7(4). 1711 pp.
  • Van Wijk, H. L. 1911. A dictionary of plant names. Martinus Nijhoff, The Hague, The Netherlands. 1444 pp.
  • Victorin, M. 1964. Flore Laurentienne. 2nd ed. Univ. Montreal, Montreal, Que., Canada. 952 pp.

Geographic Information

  • Alberta
  • British Columbia

References:

  • Bailey, L. H., Bailey, E. Z. 1976. Hortus third. Revised. MacMillan, New York, N.Y., USA. 1290 pp.
  • Boivin, B. 1966, 1967. Énumération des plantes du Canada. Provencheria 6. Nat. Can. (Que.) 93: 253-274; 371-437; 583-646; 989-1063. 94: 131-157; 471-528; 625-655.

Image or Illustration

Images: White rose-bay - Google search

Toxic Parts:

  • leaves

References:

  • Looman, J., Majak, W., Smoliak, S. 1983. Stock-poisoning plants of western Canada. Agric. Can. Res. Branch Contrib. 1982-7E. 35 pp.

Notes on Toxic Plant Chemicals:

Andromedotoxins (including grayanotoxin I) are toxic diterpenoids that are present in all the poisonous members of the heath family, Ericaceae (Cooper and Johnson 1984).

Toxic Plant Chemicals:

  • andromedotoxins

References:

  • Cooper, M. R., Johnson, A. W. 1984. Poisonous plants in Britain and their effects on animals and man. Her Majesty's Stationery Office, London, England. 305 pp.

Animals/Human Poisoning:

Note: When an animal is listed without additional information, the literature (as of 1993) contained no detailed explanation.

Cattle

General Symptoms of Poisoning:

Notes on Poisoning:

Cattle are not poisoned as often as sheep because of the bitter taste of the leaves. Symptoms of ingestion may include initial anorexia, salivation, and dullness. Vomiting may be accompanied by bloat. Abdominal pain and nasal discharge occur. In severe cases, death may result (Kingsbury 1964).

References:

  • Kingsbury, J. M. 1964. Poisonous plants of the United States and Canada. Prentice-Hall Inc., Englewood Cliffs, N.J., USA. 626 pp.

Sheep

General Symptoms of Poisoning:

Notes on Poisoning:

The palatability of the leaves is low. However, ingesting the leaves causes symptoms, including salivation, nasal discharge, convulsions, paralysis of the limbs, and weakness. In severe cases, death can occur after a period of coma (Looman et al. 1983).

References:

  • Kingsbury, J. M. 1964. Poisonous plants of the United States and Canada. Prentice-Hall Inc., Englewood Cliffs, N.J., USA. 626 pp.
  • Looman, J., Majak, W., Smoliak, S. 1983. Stock-poisoning plants of western Canada. Agric. Can. Res. Branch Contrib. 1982-7E. 35 pp.

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