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Rhododendron tomentosum Harmaja - syn.Ledum palustre L. - Ericaceae
marsh tea, marsh cistus, wild rosemary, Sumpfporst
Perennial evergreen shrub, 0.60-1.50m tall, native to North Europe, East Europe and northern Asia; leaves linear to lanceolate, 4-12 times as long as wide; flowers withe, stamens 10.
„The flowers are small, with a five-lobed white corolla, and produced several together in a corymb 3-5 cm diameter. They emit strong smell to attract bees and other pollinating insects.“ http://en.wikipedia.org/wiki/Rhododendron_tomentosum
„Wild Rhododendron tomentosum Harmaja shoots were collected from four localities of Estonia. Essential oils, isolated from dried samples by simultaneous distillation and extraction, were analysed using GC-FID and Gas chromatography–mass spectrometry methods. The yields of oils were in the range 0.14–0.87%. A total of 72 constituents, accounting for over 95% of the total oil yield, were identified. The major components in the all four oils studied were palustrol (15.9–53.5%), ledol (11.8–18.3%), γ-terpineol (0–31.2%), p-cymene (0.1–13.9%), lepalone (0.7–6.5%), lepalol (1.0–6.5%) and cyclocolorenone (1.0–6.4%). Two different chemotypes of R. tomentosum were found in Estonia and one of them was rich in palustrol (41.0–53.5%) and ledol (14.6–18.3%). The second chemotype, for the first time, was rich in γ-terpineol (24.7–31.2%) and contained less of palustrol (15.9–16.7%) and ledol (11.8–12.8%), but more p-cymene (12.5–13.9%). Also, γ-terpineol was identified for the first time in the oils of R. tomentosum.“
[Composition of the essential oil of the Rhododendron tomentosum Harmaja from Estonia., Raal, A., Orav, A., Gretchushnikova, T., Natural product research, (ahead-of-print), 2014, 1-8]
