Kindly sponsored by
Peter Norris, enabling the use of The Rhododendron Handbook 1998
New article for Trees and Shrubs Online.
'Rhododendron decandrum' from the website Trees and Shrubs Online (treesandshrubsonline.
Shrub or small tree; young shoots soon glabrous. Leaves in whorls of up to three, at the ends of the branches, 2-3(-6) x 2-4 cm, broadly rhombic, apex acuminate, lower surface with glands, especially on midrib and veins; petioles sparsely glandular, also with villose hairs. Pedicels villose, densely so at base, also glandular. Flowers solitary or up to 3 per inflorescence, appearing before the leaves; calyx minute; corolla magenta, with flecks, open-funnel-campanulate, 25-28 mm; stamens 10; ovary glandular, with a few villose hairs, style glabrous. Flowering April-May. Royal Horticultural Society (1997)
Distribution Japan Honshu, Shikoku
Habitat c.800 m
RHS Hardiness Rating H6
Conservation status Least concern (LC)
Distinguished from the apparently allied R. dilatatum by the presence of 10 stamens. Royal Horticultural Society (1997)