J. Jap. Bot. 49: 353 (1974)
Verified by:
Shrub, to 3m; young shoots greyish, ± glandular, later glabrescent. Leaves broadly rhombic-ovate, 2.5-6 x 1.5-5cm, apex shortly cuspidate, base broadly cuneate, upper surface sparsely glandular ar first, covered with long white hairs, later glabrescent, with persistent hair bases, lower surface pale, with adpressed hairs, or glabrous though with minute papillate glands and long hairs on the nerves; petioles 5-12mm, glandular. Inflorescence l-3-flowered; pedicels 10-15mm, glandular, pilose below. Calyx c.3mm. glandular, sometimes ciliate. Corolla funnel-campanulate, 25-30mm, magenta, lobes C.17mm, oblong-obovate. Stamens 10, unequal, filaments glabrous. Ovary shortly stipitate-glandular, with scattered pilose hairs; style glabrous. Capsule 9-11 x c.3mm.
Japan (S Hokkaido)
Wooded mountain slopes
R. dilatatum Miquel var. boreale Sugimoto, New Keys Woody PI. Japan 509 (1972). Type as above.
Chamberlain, D.F. & Rae, S.J. (1990) A Revision of Rhododendron IV Subgenus Tsutsusi. Edinburgh Journal of Botany 47(2):146