Kindly sponsored by
Peter Norris, enabling the use of The Rhododendron Handbook 1998
New article for Trees and Shrubs Online.
'Rhododendron sidereum' from the website Trees and Shrubs Online (treesandshrubsonline.
Shrub or small tree, 3-9 m; bark rough. Leaves (9-)16-23 x 4-6.3 cm, narrowly elliptic to oblanceolate, apex acute to rounded and apiculate, lower surface covered with a one-layered buff to silvery, sometimes shining compacted and agglutinated indumentum composed of rosulate hairs; petioles terete. Flowers 12-20 to a truss, cream to clear yellow, sometimes with a red basal blotch, ventricose-campanulate, with nectar pouches, 30-40 mm; stamens c.16; ovary densely rufous-tomentose. Flowering April-May. Royal Horticultural Society (1997)
Distribution Myanmar NE China W Yunnan
Habitat 2,500-3,700 m
RHS Hardiness Rating H3
Awards AM 1964 (National Trust for Scotland, Bridock Castle Gardens) to a clone 'Glen Rosa'; flowers Primrose Yellow, with a dark crimson blotch.
Conservation status Near threatened (NT)
This is a tender species that is only occasionally grown in Britain. Royal Horticultural Society (1997)