Northeastern Asian Flora
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Rhododendron tomentosum Harmaja  
Family: Ericaceae
[Ledum canadense Lodd., moreLedum decumbens (Aiton) Lodd. ex Steud., Ledum groenlandicum Oeder, Ledum latifolium Jacq., Ledum macrophyllum Tolm., Ledum maximum (Nakai) A.P.Khokhrjakov & M.T.Mazurenko, Ledum pacificum Small, Ledum palustre L., Ledum palustre f. decumbens (Aiton) Y.L.Chou & S.L.Tung, Ledum palustre f. diversiplosum (Nakai) Makino & Tanaka, Ledum palustre f. pavifolia Maack, Ledum palustre f. yesoense (Nakai) Makino & Tanaka, Ledum palustre subsp. decumbens (Aiton) Hultén, Ledum palustre subsp. groenlandicum (Oeder) Hult?, Ledum palustre var. angustifolium Hook., Ledum palustre var. angustum E.A.Busch, Ledum palustre var. decumbens Aiton, Ledum palustre var. dilatatum Wahlenb., Ledum palustre var. diversipilosum Nakai, Ledum palustre var. groenlandicum (Oeder) Rosenv., Ledum palustre var. latifolium Michx., Ledum palustre var. maximum Nakai, Ledum palustre var. minus Nakai, Ledum palustre var. nipponicum Nakai, Ledum palustre var. subulatum Nakai, Ledum palustre var. yesoense Nakai, Ledum palustriforme A.P.Khokhr. & M.T.Mazurenko, Ledum tomentosum Stokes, Rhododendron diversipilosum (Nakai) Harmaja, Rhododendron subarcticum Harmaja, Rhododendron tomentosum subsp. subarcticum (Harmaja) G.D.Wallace]
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  • Japan Flora
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Japan Flora: Rusty-tomentose, erect, aromatic shrub, 30-50 cm. high; leaves coriaceous, lancedate, 3-5 cm. long, 5-12 mm. wide, obtuse to acute, some­times mucronate, deep green, entire, with yellow sessile glands especially while young, usually glaucous and white-papillose beneath, recurved on margin, the petioles 1-5 mm. long; corymbs densely many-flowered, terminal and sessile, densely pubcruient, often glandular-dotted, the pedicels 1-3 cm. long, the bracts ovate, acute, caducous; flowers white, 8-10 mm. across; petals elliptic, glabrous; capsules oblong, 5-vaIvcd, ob­tuse at both ends, 4-5 mm. long, glandular-dotted, nodding; styles nearly as long as to slightly shorter than the capsules. June-July. Wet boggy slopes and high moors;

Hokkaido, Honshu (n. distr.); gregarious.  Sakhalin, s. Kuriles, Ko­rea, and e. Siberia.

Rhododendron tomentosum
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Development supported by College of Agriculture and Life Sciences of Seoul
National University and Korea National Arboretum of Korea Forest Service.
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