Kindly sponsored by
Peter Norris, enabling the use of The Rhododendron Handbook 1998
New article for Trees and Shrubs Online.
'Rhododendron sororium' from the website Trees and Shrubs Online (treesandshrubsonline.
Shrub to 2 m, terrestrial, young stems covered in small stalkless scales, quickly glabrescent, sometimes rough from raised leaf scars but not from scale bases. Leaves 2.5-4.5 x 1-2 cm, obovate with an emarginate apex in which lies a distinct apical gland, margin slightly recurved, somewhat cartilaginous, the base narrowly tapering; upper surface finely scaly at first, quickly glabrescent, the midrib impressed, laterals 1-3 pairs, slightly impressed; underside with the midrib slightly raised, the laterals slightly raised or obscure, the scales widely spaced, variable, slightly depressed, the smaller circular and pale brown, the larger darker brown and clearly lobed. Flowers solitary or occasionally paired, horizontal to half-hanging; calyx a low ring; corolla yellow, campanulate 1-1.5 x 0.8-1.4 cm, densely scaly outside; stamens 10, dimorphic, arranged all round the mouth of the corolla; ovary densely scaly, style glabrous. Royal Horticultural Society (1997)
Distribution Vietnam Tonkin, Lao Kay
Habitat 1,400-1,700 m
RHS Hardiness Rating H2
Conservation status Least concern (LC)
Widely distributed and in many collections from recent wild seed exchanges but not yet well known as most plants have yet to reach flowering size. Royal Horticultural Society (1997)