Kindly sponsored by
Peter Norris, enabling the use of The Rhododendron Handbook 1998
Article from Bean's Trees and Shrubs Hardy in the British Isles
'Rhododendron mucronulatum' from the website Trees and Shrubs Online (treesandshrubsonline.
Straggling shrub, to 2 m; young shoots scaly and puberulous. Leaves thin, completely deciduous, 4-6 x 1.5-3 cm, elliptic to lanceolate, apex mucronate, upper surface puberulent on midrib, with strigose hairs towards the margin, lower surface sparsely scaly Flowers solitary, axillary, but at the tips of the branches, opening before the leaves; calyx rim-like; corolla bright mauve pink, rarely white, very openly funnel-shaped, 21-26 mm, outer surface pilose near base; stamens 10; ovary scaly, style impressed, declinate. Flowering January-March. Royal Horticultural Society (1997)
Distribution China Hubei, Shandong Japan Honshu, Kyushu South Korea Mongolia Russia E Siberia
Habitat 300 m upwards
RHS Hardiness Rating H6
Awards AM 1924 (Royal Botanic Gardens, Kew); flowers rich purplish rose. AM 1935 (Royal Botanic Gardens, Kew) to a clone 'Roseum'; flowers bright rose. AM 1965 (Crown Estate Commissioners, Windsor) to a clone 'Winter Brightness'; flowers a rich purplish rose. AGM 1993, to a clone 'Cornell Pink. AGM 1993 to a clone 'Winter Brightness'.
Conservation status Vulnerable (VU)
Taxonomic note This species is closely allied to R. dauricum (q.v.). A dwarf form, 10-50 cm high, from Cheju Island & the mainland of S Korea, has been given the name var. taquetii (H.Lev.) Nakai (syn. var. chejuense Davidian). Royal Horticultural Society (1997)
A deciduous shrub of erect, thinnish habit, up to 6 or 8 ft high, the twigs slender and glabrous except for a few scales. Leaves lanceolate or inclined to oblanceolate, slenderly pointed, 11⁄4 to 4 in. long, 1⁄2 to 11⁄4 in. wide; of thin texture; stalk 1⁄8 to 1⁄4 in. long. Flowers produced singly from each of a cluster of buds at the end of the naked shoots, sometimes as many as six at the tip of one shoot, often opening successively; flower-stalk 1⁄4 in. long, hidden by the scales of the flower-bud. Calyx small, shallowly five-lobed. Corolla pale rose-purple, opening widely, 11⁄2 to 2 in. across, five-lobed, downy outside. Stamens ten, their stalks downy at the base; anthers dark purple. Ovary covered with close, minute scales; style glabrous. Bot. Mag., t. 8304. (s. Dauricum)
Native of N. China, the Ussuri region of Russia, Korea, and Japan (where it is found only in the parts nearest to Korea – N. Kyushu and the Chugoku district of the main island). According to Wilson, it is abundant in Korea in thin woods and open country, and especially so in the north, where it forms the undergrowth of larch forest on volcanic soils. It was described in 1837 from specimens collected on the Pohuashan near Peking, and introduced from there to the Arnold Arboretum, USA, in 1882 by Dr Bretschneider. The first recorded introduction to Kew was in 1907, when plants were received from a Yokohama nursery, but Edinburgh had it nine years earlier from an unknown source.
Under cultivation the flowering season of this species varies according to the weather. At Kew, as a rule, it is at its best from Christmas to the beginning of February. I have seen it in splendid bloom on Christmas Day. The flowers are destroyed by about five degrees of frost, but are often succeeded by a fresh crop. After a hard winter and spring, flowers will open as late as April. This shrub must be included amongst the very best of winter flowerers, for few give so beautiful a display so early in the year. In botanical detail it scarcely differs from R. dauricum, but in its greater size and vigour, its larger more pointed leaves, and its larger flowers it is very different. It is also superior as a garden shrub.
R. mucronulatum has twice received an Award of Merit when shown from Kew: on February 12, 1924 (flowers purplish rose) and on January 8, 1935 (flowers light rose). It was given a First Class Certificate on January 22, 1957, when shown by the Crown Estate Commissioners, Windsor Great Park (clone later named ‘Winter Sunset’, flowers rich purplish rose).