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'Rhododendron formosanum' from the website Trees and Shrubs Online (treesandshrubsonline.
Shrub or small tree, 2–5.5 m. Leaves 7–13 × 1.5–3 cm, elliptic to oblanceolate, apex cuspidate, upper surface reticulate, lower surface with a one-layered compacted fawn indumentum intermixed with a few glands; petioles 1–2 cm. Flowers 10–20, in an open inflorescence, white to pink, with purplish flecks, widely funnel-shaped, nectar pouches lacking, 30–40 mm; ovary densely reddish-tomentose, style glabrous. Flowering April. Royal Horticultural Society (1997)
Distribution Taiwan
Habitat 800–2,000 m
RHS Hardiness Rating H5
Conservation status Least concern (LC)
The relatively narrow leaves with a one-layered indumentum and short petioles will distinguish this from the remaining species in Subsect. Argyrophylla. It is little grown as some forms are tender. Royal Horticultural Society (1997)