Ledum

Ledum

Taxobox
name = "Rhododendron" subsect. "Ledum"


image_width = 240px
image_caption = "Rhododendron tomentosum" ("Ledum palustre")
regnum = Plantae
divisio = Magnoliophyta
classis = Magnoliopsida
ordo = Ericales
familia = Ericaceae
genus = "Rhododendron"
subsectio = "Ledum"
subdivision_ranks = Species
subdivision = See text.

"Ledum" is a genus name formerly widely recognised in the family Ericaceae, including 8 species of evergreen shrubs native to cool temperate and subarctic regions of the Northern Hemisphere and commonly known as Labrador Tea.

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.

;SpeciesThe species formerly listed in "Ledum", with their current accepted names in "Rhododendron", are:
*"Ledum decumbens" = "Rhododendron subarcticum" Harmaja
*"Ledum glandulosum" = "Rhododendron neoglandulosum" Harmaja
*"Ledum groenlandicum" = "Rhododendron groenlandicum" (Oeder) Kron & Judd
*"Ledum hypoleucum" = "Rhododendron hypoleucum" (Kom.) Harmaja
*"Ledum macrophyllum" = "Rhododendron tolmachevii" Harmaja
*"Ledum palustre" = "Rhododendron tomentosum" Harmaja
*"Ledum palustre" var. "diversipilosum" = "Rhododendron diversipilosum" (Nakai) Harmaja
*"Ledum subulatum" = "Rhododendron subulatum" (Nakai) Harmaja

;HybridsOne natural hybrid also occurs:
*"Ledum columbianum" = "Rhododendron × columbianum" ("R. groenlandicum" × "R. neoglandulosum")

Uses

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.

"Ledum" sp. often grows 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.

References

1. Kron, Kathleen A. & Judd, Walter S. (1990) Phylogenetic Relationships within the Rhodoreae (Ericaceae) with Specific Comments on the Placement of "Ledum" Systematic Botany (1990), 1S(1): pp. S7-68

2. Harmaja, Harri (1990) New names and nomenclatural combinations in "Rhododendron" (Ericaceae) Ann. Bot. Fennici 27:203-204

3. Harmaja, Harri (1991) Taxonomic notes on "Rhododendron" subsection Ledum ("Ledum", Ericaceae), with a key to its species. "Ann. Bot. Fennici" 28: 171-173.

[http://www.sekj.org/PDF/anbf35/anbf35-263p.pdf 4. Harmaja, Harri (1999) "Rhododendron diversipilosum", comb. nov. (Ericaceae). Ann. Bot. Fennici 35: 263-264]

[http://www.sekj.org/PDF/anb39-free/anb39-183s.pdf 5. Harmaja, Harri (2002) "Rhododendron subulatum", comb. nova (Ericaceae). Ann. Bot. Fennici 39: 183-184]

6. Kihlman, Bengt A. (2004) Hybrids Between Ledums and Lepidote Rhododendrons. Journal of the American Rhododendron Society 58(2):74-81


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Look at other dictionaries:

  • Ledum — prop. n. A genus of evergreen shrubs of the north temperate regions. Syn: genus {Ledum}. [WordNet 1.5] …   The Collaborative International Dictionary of English

  • Ledum — (L. L.), Pflanzengattung aus der Familie der Ericaceae Rhododendreae, 10. Kl. 1. Ordn. L.; Kelch klein, fünfzähnig, fünfblättrige Blumenkrone, Staubgefäße an der Spitze mit zwei Öffnungen aufspringend, Kapsel fünffächerig, in fünf Klappen… …   Pierer's Universal-Lexikon

  • Ledum — L. (Porst), Gattung der Erikazeen, kleine, immergrüne Sträucher mit zerstreut stehenden, kurzgestielten, schmalen oder breit lanzettlichen, am Rande zurückgerollten, unterseits rostig filzigen, lederartigen, immergrünen Blättern, langgestielten,… …   Meyers Großes Konversations-Lexikon

  • Ledum — L., Porst, Pflanzengattg. der Erikazeen, immergrüne Sträucher der nördl. gemäßigten und der arktischen Zonen. In Europa L. palustre L. (gemeiner Porst, wilder Rosmarin, Sumpf oder Kienporst), Torfpflanze mit widerlich aromatisch riechenden… …   Kleines Konversations-Lexikon

  • LEDUM — Gall. Narbon. fluv. P. Mela. l. 2. c. 5. Vulgo Le Lez Amnis Occitaniae, oritur 3. leuc. supra Montem Peslulanum, In Cebennis, si Sirmundo creditur. Alluit castrum Monreferrandum, Prata Prades, castrum Montem ferrarium Montferrier, Castrum novum… …   Hofmann J. Lexicon universale

  • Ledum —   Ledum (Ledum palustre) …   Wikipedia Español

  • Ledum — Lédon Lédon …   Wikipédia en Français

  • Ledum — Lédon …   Wikipédia en Français

  • Ledum — gailis statusas T sritis vardynas apibrėžtis Erikinių (Ericaceae) šeimos augalų gentis (Rhododendron). atitikmenys: lot. Ledum angl. ledum; wild rosemary vok. Ledum; Porst rus. багульник lenk. bagno …   Dekoratyvinių augalų vardynas

  • ledum — gailis statusas T sritis vardynas apibrėžtis Erikinių (Ericaceae) šeimos augalų gentis (Rhododendron). atitikmenys: lot. Ledum angl. ledum; wild rosemary vok. Ledum; Porst rus. багульник lenk. bagno …   Dekoratyvinių augalų vardynas

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