Shrub, 4–6 m; bark rough. Leaves up to 24 × 11.5 cm, 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, 40–50 mm; stamens 16; ovary densely brownish-tomentose. Flowering March-April. Royal Horticultural Society (1997).
Distribution China SE Tibet, NW Yunnan
Habitat 3,700–4,000 m
RHS Hardiness Rating H4
Conservation status Vulnerable (VU)
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. Royal Horticultural Society (1997).