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Shrub, 4-6m; bark rough. Leaves up to 24 x 11.5cm, obovate-lanceolate, upper surface reticulate, lower surface covered with a two-layered undumentum, the upper layer loosely tomentose, whitish to buff, composed of strongly fimbriate, narrowly cup-shaped hairs, the lower compacted; petioles more or less flattened. Flowers c.15, in a dense truss, white flushed rose, obliquely campanulate, nectar pouches lacking, 40-50mm; stamens 16; ovary densely brownish-tomentose.
Distribution China (SE Tibet, NW Yunnan).
RHS Hardiness H3-4a.
R. semnoides may have been derived as a hybrid between R. praestans and R. arizelum; plants in the wild presumed to be of that parentage are a good match.