Ericaceae FAMILY Least Concern

Rhododendron ferrugineum

Edibility

0/5

Medicinal

2/5

Safety & Hazards

Although no specific mention of toxicity has been seen for this species, all parts of Rhododendron species (including the leaves, flowers and pollen) contain greater or lesser amounts of the toxic compound andromedotoxin (also known as grayanotoxin). Rarely lethal to humans (and used medicinally in some herbal disciplines), this compound causes dose-dependant overstimulation of the central nervous system with symptoms including various cardiovascular effects (mainly low blood pressure and cardiac rhythm disorders); nausea and vomiting; and a change in consciousness. The effects commence shortly after ingestion and last around two days. These effects are also transferred to honey made from the nectar of the flowers. In some parts of the world bees are used to deliberately produce a honey rich in andromedotoxin which is then eaten for its supposed medicinal, hallucinogenic and aphrodisiac effects. In contrast to humans, many other creatures are more susceptible to the toxin and it has sometimes proved lethal to grazing animals and household pets. Some forms of honeybees are also killed by the toxin (resistant forms of the bee are used for honey production). Bumblebees are not affected, however, and are also more efficient in pollinating rhododendron flowers, so one theory is that the toxin is produced by the plant in order to favour the bumblebee and improve fertilization rates[ 1668 Title Grayanotoxin Poisoning: ‘Mad Honey Disease’ and Beyond Publication Cardiovasc Toxicol (2012) 12:208-215 Author Jansen S.A. et al Website https://doi.org/10.1007/s12012-012-9162-2 Publisher Year 2012 ISBN Description An in-depth review of the literature on the toxic effects of a toxin widely found in the family Ericaceae ].

Botanical Description

Rhododendron ferrugineum is a dwarf, evergreen shrub of close habit - it can eventually reach up to 1.50 metres tall and wide, forming a dense hemispherical mass[ 11 Title Trees and Shrubs Hardy in Great Britain. Vol 1 - 4 and Supplement. Publication Author Bean. W. Publisher Murray Year 1981 ISBN - Description A classic with a wealth of information on the plants, but poor on pictures. ]. The plant is harvested from the wild for local use as a medicine and source of materials.. It is sometimes grown as an ornamental in gardens, where it can be used to form a ground cover. Rhododendron ferrugineum is an abundant species in montane areas of the Alps and Pyrenees. It has a relatively wide distribution, stable populations and no major threats. The plant is classified as 'Least Concern' in the IUCN Red List of Threatened Species(2013)[ 338 Title IUCN Red List of Threatened Species Publication Author Website http://www.iucnredlist.org/ Publisher Year 0 ISBN Description A list of plants under threat and facing possible extinction, usually with brief details of the threats and information on habitat. ].

Habitat & Origin

Origintemperate

Native RangeEurope - mountainous regions from Spain to Germany and east to Austria and the Balkans.

HabitatAcidic soils associated with Pinus species[ 338 Title IUCN Red List of Threatened Species Publication Author Website http://www.iucnredlist.org/ Publisher Year 0 ISBN Description A list of plants under threat and facing possible extinction, usually with brief details of the threats and information on habitat. ]. Mountain slopes in open woods or scrub, often dominant in the dwarf shrub zone; at elevations from 1,600 - 2,200 metres[ 50 Title Flora Europaea Publication Author ? Publisher Cambridge University Press Year 1964 ISBN - Description An immense work in 6 volumes (including the index). The standard reference flora for Europe, it is very terse though and with very little extra information. Not for the casual reader. , 338 Title IUCN Red List of Threatened Species Publication Author Website http://www.iucnredlist.org/ Publisher Year 0 ISBN Description A list of plants under threat and facing possible extinction, usually with brief details of the threats and information on habitat. ].