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Shrub, 1-2m; young shoots and petioles densely covered with loosely adpressed flattened bristles that are intermixed with softer grey-brown, sometimes gland-tipped hairs. Leaves of two kinds; spring leaves deciduous, 3.5-5 x 1.5-2cm, ovate-lanceolate, apex mucronate, both surfaces covered with adpressed reddish grey pilose hairs, especially on the midrib; summer leaves 1.5-3 x 0.5-1cm, oblanceolate. Pedicels covered with soft spreading pilose hairs, sometimes with glandular and flattened bristles. Flowers 1-3 per inflorescence; calyx to 15mm; corolla white or rose-pink to red, widely funnel-shaped, 25-50mm; stamens 10; ovary covered with bristles, style glabrous.
Distribution Japan (Honshu, Shikoku, Kyushu).
RHS Hardiness H3-4a.
This species is closely allied to R. stenopetalum but differs in the smaller leaves and adpressed-hairy shoots, etc.
R. mucronatum, with white flowers, is presumed to be an artificial hybrid derived from R. ripense and R. stenopetalum.