Rhododendron degronianum ssp. yakushimanum

Description with 21 photos. Photo: Finn Bertelsen. A slow-growing, evergreen shrub with extended growth pattern. Hardy. Branchlets and petioles covered by a whitish, later cinnamon brown tomentum. Leaf blade narrow elliptic to lanceolate, arched with revolute margins, coriaceous. Leaf apex acute, without mucro. Leaf base obtuse. Leaf adaxial side dark green with at first, a thin, felty, whitish tomentum which decomposes later in the growth season. Leaf abaxial side with a thick, bistrate indumentum, including the midrib. Upper layer cinnamon brown, woolly, composed of very fine-fibred dendroid hairs. Lower layer whitish, compact, thin. Flower bud broadly ovoid, with felted cover scales. Pedicel and calyx with fine, hairy tomentum. Calyx lobes rounded. Corolla with 5 lobes, funnel-campanulate, whitish pink, fast fading into white. Ovary hairy. Stamens 10. Style glabrous with upwards bent, swollen, yellow stigma. Capsule densely covered by dendroid hairs, to 13 mm. Seeds with wings and floating appendages, 2.4 – 2.5 mm. Native habitat: Yakushima, Japan according to Pearson, R., 1978. J.Am.Rho.Soc., V.32,2.