Rhododendron subsect. Ledum

Rhododendron subsect. Ledum
Rhododendron columbianum (Ledum glandulosum)
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Ericales
Family: Ericaceae
Genus: Rhododendron
Subgenus: Rhododendron subg. Rhododendron
Section: Rhododendron sect. Rhododendron
Subsection: R. subsect. Ledum
(L.) Kron & Judd
Species

See text

Ledum was a genus in the family Ericaceae, including eight species of evergreen shrub native to cool temperate and subarctic regions of the Northern Hemisphere and commonly known as Labrador tea. It is now recognised as a subsection of section Rhododendron, subgenus Rhododendron, of the genus Rhododendron.

Description

Ledum species often grow together with poisonous plants such as bog-laurel and bog-rosemary, but certain species (e.g. L. groenlandicum and L. palustre) are easily distinguished by the distinctive rust coloured fuzz on the bottom of leaves.

Taxonomy

Reclassification into Rhododendron

Recent genetic evidence has shown that the species previously treated in this genus are correctly placed in the genus Rhododendron, where they are now treated as Rhododendron subsect. Ledum. Because some of the species names used in Ledum could not be used in Rhododendron (the names already having been used for other species already in this large genus), new names had to be coined for them.

Species

The species listed in genus Ledum (accepted and synonyms), with their current accepted names are:

Ledum speciesAuthorGBIF statusTPL statusGBIF Accepted speciesAuthorGBIF statusTPL Accepted speciesAuthorTPL status
LedumL.Accepted
Ledum angustifoliumHort. ex LavalléeAccepted
Ledum buxifoliumBergiusSynonymKalmia buxifolia(Bergius) Gift & KronAccepted
Ledum californicumKelloggSynonymLedum glandulosumAccepted
Ledum columbianumPiperSynonymAcceptedRhododendron columbianum(Piper) HarmajaAccepted
Ledum decumbens(Ait.) Lodd.SynonymRhododendron tomentosum subsp. decumbens(Aiton) Elven & D.F.MurrayAccepted
Ledum decumbens(Ait.) Lodd. ex Steud.SynonymSynonymRhododendron tomentosum subsp. decumbens(Aiton) Elven & D.F.MurrayAcceptedLedum palustre subsp. decumbensAccepted
Ledum decumbensSmallAcceptedAccepted
Ledum glandulosumNutt.SynonymAcceptedRhododendron neoglandulosumHarmajaAccepted
Ledum glandulosum subsp. glandulosumSynonymLedum glandulosumAccepted
Ledum glandulosum var. californicum(Kellogg) C.L.Hitchc.SynonymLedum glandulosumAccepted
Ledum glandulosum var. glandulosumSynonymLedum glandulosumAccepted
Ledum groenlandicumOederSynonymSynonymRhododendron groenlandicum(Oeder) K.A.Kron & W.S.JuddAcceptedLedum palustre subsp. groenlandicumAccepted
Ledum groenlandicumRetz.Accepted
Ledum groenlandicum f. denudatumVict. & J.RousseauAccepted
Ledum groenlandicum subsp. glandulosum(Nutt.) Á.Löve & D.LöveSynonymSynonymRhododendron neoglandulosumHarmajaAcceptedLedum glandulosumAccepted
Ledum groenlandicum var. aridiphilumD.LöveAccepted
Ledum hypoleucumKom.SynonymSynonymRhododendron diversipilosum(Nakai) H.HarmajaAcceptedRhododendron hypoleucum(Kom.) HarmajaAccepted
Ledum idahoensisAccepted
Ledum macrophyllumTolm.SynonymAcceptedRhododendron diversipilosum(Nakai) H.HarmajaAccepted
Ledum maximum(Nakai) A.P.Khokhr. & M.T.MazurenkoSynonymAcceptedRhododendron tomentosumHarmajaAccepted
Ledum palustreL.SynonymAcceptedRhododendron tomentosumHarmajaAccepted
Ledum palustreMichx.SynonymRhododendron groenlandicum(Oeder) K.A.Kron & W.S.JuddAccepted
Ledum palustre f. decumbens(Aiton) Y.L.Chou & S.L.TungSynonymLedum palustre subsp. decumbensAccepted
Ledum palustre subsp. angustissimumWorosch.SynonymRhododendron subulatum(Nakai) HarmajaAccepted
Ledum palustre subsp. decumbens(Aiton) HulténAccepted
Ledum palustre subsp. diversipilosumHaraSynonymLedum macrophyllumAccepted
Ledum palustre subsp. groenlandicum(Oeder) HulténSynonymAcceptedRhododendron groenlandicum(Oeder) K.A.Kron & W.S.JuddAccepted
Ledum palustre var. angustifoliumHook.Accepted
Ledum palustre var. angustumE.A.BuschSynonymLedum palustreAccepted
Ledum palustre var. decumbensAitonSynonymLedum palustre subsp. decumbensAccepted
Ledum palustre var. diversipilosumNakaiSynonymSynonymRhododendron diversipilosum(Nakai) H.HarmajaAcceptedLedum macrophyllumAccepted
Ledum palustre var. latifolium(Jacq.) Hook.SynonymRhododendron groenlandicum(Oeder) K.A.Kron & W.S.JuddAccepted
Ledum palustre var. latifolium(Jacq.) Michx.SynonymRhododendron groenlandicum(Oeder) K.A.Kron & W.S.JuddAccepted
Ledum palustre var. maximumNakaiSynonymLedum maximumAccepted
Ledum palustre var. palustreSynonymLedum palustreAccepted
Ledum palustre var. subulatumNakaiSynonymRhododendron subulatum(Nakai) HarmajaAccepted
Ledum serpyllifoliumAccepted
Ledum subulatum(Nakai) A.P.Khokhr. & M.T.MazurenkoSynonymSynonymRhododendron subulatum(Nakai) HarmajaAcceptedRhododendron subulatum(Nakai) HarmajaAccepted

Species references

Ledum

  1. ↑ GBIF Secretariat, ed. (2016). "Ledum L." GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  2. ↑ GBIF Secretariat, ed. (2016). "Ledum angustifolium Hort. ex Lavallée". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  3. ↑ TPL Reference: group=Ledum name=tro-50176889 Coming soon
  4. ↑ TPL Reference: group=Ledum name=tro-50092423 Coming soon
  5. 1 2 3 4 5 6 TPL Reference: group=Ledum name=tro-12300614 Coming soon
  6. ↑ GBIF Secretariat, ed. (2016). "Ledum columbianum Piper". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  7. ↑ TPL Reference: group=Ledum name=tro-12300613 Coming soon
  8. ↑ GBIF Secretariat, ed. (2016). "Ledum decumbens (Ait.) Loddiges". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  9. ↑ GBIF Secretariat, ed. (2016). "Ledum decumbens (Ait.) Loddiges ex Steudel". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  10. ↑ TPL Reference: group=Ledum name=kew-2349911 Coming soon
  11. 1 2 3 4 TPL Reference: group=Ledum name=kew-2355735 Coming soon
  12. ↑ GBIF Secretariat, ed. (2016). "Ledum decumbens Small". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  13. ↑ TPL Reference: group=Ledum name=tro-12300073 Coming soon
  14. ↑ GBIF Secretariat, ed. (2016). "Ledum glandulosum Nutt". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  15. ↑ TPL Reference: group=Ledum name=tro-12302631 Coming soon
  16. ↑ TPL Reference: group=Ledum name=tro-12300615 Coming soon
  17. ↑ TPL Reference: group=Ledum name=tro-12302504 Coming soon
  18. ↑ GBIF Secretariat, ed. (2016). "Ledum groenlandicum Oeder". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  19. ↑ TPL Reference: group=Ledum name=kew-2349909 Coming soon
  20. 1 2 TPL Reference: group=Ledum name=kew-2355734 Coming soon
  21. ↑ GBIF Secretariat, ed. (2016). "Ledum groenlandicum Retz". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  22. ↑ GBIF Secretariat, ed. (2016). "Ledum groenlandicum f. denudatum Vict. & J.Rousseau". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  23. ↑ GBIF Secretariat, ed. (2016). "Ledum groenlandicum var. aridiphilum D.Löve". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  24. ↑ TPL Reference: group=Ledum name=tro-50298977 Coming soon
  25. ↑ GBIF Secretariat, ed. (2016). "Ledum groenlandicum var. aridiphilum D.Löve". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  26. ↑ GBIF Secretariat, ed. (2016). "Ledum hypoleucum Komarov". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  27. ↑ TPL Reference: group=Ledum name=tro-12303119 Coming soon
  28. ↑ GBIF Secretariat, ed. (2016). "Ledum idahoensis". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  29. ↑ GBIF Secretariat, ed. (2016). "Ledum macrophyllum Tolm". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  30. 1 2 3 TPL Reference: group=Ledum name=tro-12300074 Coming soon
  31. ↑ GBIF Secretariat, ed. (2016). "Ledum maximum (Nakai) A.P.Khokhrjakov & M.T.Mazurenko". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  32. 1 2 TPL Reference: group=Ledum name=tro-50194624 Coming soon
  33. ↑ GBIF Secretariat, ed. (2016). "Ledum palustre L." GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  34. 1 2 3 TPL Reference: group=Ledum name=kew-2349893 Coming soon
  35. ↑ GBIF Secretariat, ed. (2016). "Ledum palustre Michx". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  36. ↑ TPL Reference: group=Ledum name=tro-50156076 Coming soon
  37. ↑ GBIF Secretariat, ed. (2016). "Ledum palustre subsp. angustissimum Worosch". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  38. ↑ TPL Reference: group=Ledum name=tro-12303120 Coming soon
  39. ↑ GBIF Secretariat, ed. (2016). "Ledum palustre subsp. groenlandicum (Oeder) Hulten". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  40. ↑ GBIF Secretariat, ed. (2016). "Ledum palustre var. angustifolium Hook". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  41. ↑ TPL Reference: group=Ledum name=tro-50156075 Coming soon
  42. ↑ TPL Reference: group=Ledum name=kew-2355732 Coming soon
  43. ↑ GBIF Secretariat, ed. (2016). "Ledum palustre var. diversipilosum Nakai". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  44. ↑ TPL Reference: group=Ledum name=tro-12303121 Coming soon
  45. ↑ GBIF Secretariat, ed. (2016). "Ledum palustre var. latifolium (Jacq.) Hook". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  46. ↑ GBIF Secretariat, ed. (2016). "Ledum palustre var. latifolium (Jacq.) Michx". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  47. ↑ TPL Reference: group=Ledum name=tro-50194625 Coming soon
  48. ↑ TPL Reference: group=Ledum name=tro-50156073 Coming soon
  49. ↑ TPL Reference: group=Ledum name=tro-50194628 Coming soon
  50. ↑ GBIF Secretariat, ed. (2016). "Ledum serpyllifolium". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  51. ↑ GBIF Secretariat, ed. (2016). "Ledum subulatum (Nakai) A.P.Khokhrjakov & M.T.Mazurenko". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  52. ↑ TPL Reference: group=Ledum name=tro-50194629 Coming soon

Rhododendron

  1. ↑ GBIF Secretariat, ed. (2016). "Rhododendron columbianum (Piper) Harmaja". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  2. 1 2 GBIF Secretariat, ed. (2016). "Rhododendron tomentosum subsp. decumbens (Aiton) Elven & D.F.Murray". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  3. 1 2 GBIF Secretariat, ed. (2016). "Rhododendron neoglandulosum Harmaja". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  4. 1 2 3 4 5 GBIF Secretariat, ed. (2016). "Rhododendron groenlandicum (Oeder) K.A. Kron & W.S. Judd". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  5. 1 2 3 GBIF Secretariat, ed. (2016). "Rhododendron diversipilosum (Nakai) H. Harmaja". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  6. ↑ TPL Reference: group=Rhody name=tro-50303827 Coming soon
  7. 1 2 GBIF Secretariat, ed. (2016). "Rhododendron tomentosum Harmaja". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  8. 1 2 GBIF Secretariat, ed. (2016). "Rhododendron subulatum (Nakai) Harmaja". GBIF Backbone Taxonomy. Retrieved 2017-09-20.
  9. 1 2 TPL Reference: group=Rhody name=tro-50223463 Coming soon

Other

  1. ↑ TPL Reference: group=Kalmia name=tro-50310693 Coming soon

Hybrids

Natural hybrids (nothospecies) also occur.

Uses

Ledum (L. groenlandicum) essential oil in clear glass vial

Some species (e.g. L. groenlandicum) have been used to produce Labrador tea. Other species have varying levels of toxicity (e.g. L. glandulosum). Evergreen Labrador tea grows slowly, but retains its leaves year-round. Users should take care not to over-harvest leaves from any single plant.

See also

Notes

  1. ↑ This is an inconsistency in GBIF data: the species name is a "Synonym" but a variety is "Accepted".

References

  1. ↑ Harmaja 1991.
  2. 1 2 3 Kihlman 2004
  3. ↑ GBIF Secretariat, ed. (2016). "Rhododendron vanhoeffeni Abromeit". GBIF Backbone Taxonomy. Retrieved 2017-09-21.

Bibliography