Prostrate or low shrub, usually less than 0.2 m; bud scales persistent. Leaves 1–6 × 4–2.2 cm, obovate or spathulate, apex rounded, with a glandular apiculus, margin toothed and ciliate, lower surface pubescent on veins, otherwise glabrous. Flowers solitary or to 3, in a raceme, the peduncle bearing leafy bracts; calyx 8–18 mm, lobes oblong; corolla rose-purple (rarely white), with darker flecks, rotate, divided to the base on the lower side, 20–25 mm; stamens 10; ovary pubescent, style pubescent at base. Flowering May-June. Royal Horticultural Society (1997)
Distribution Japan N Russia E United States Aleutian Islands, Alaska
RHS Hardiness Rating H5
Conservation status Least concern (LC)
Taxonomic note Subgen. Therorhodion Royal Horticultural Society (1997)
This should have been cross-referenced, to Therorhodion in Volume IV, page 577.
Corolla lobes pubescent outside, margin ciliate; leaves of vegetative shoots without or with sparse glandular hairs.
Distribution Japan (N Honshu, Hokkaido), Russia (Kamtschatka, Kuriles), USA (Aleutian Islands, S Alaska).
R. glandulosum Small
Corolla lobes glabrous outside, margins not ciliate; Leaves of vegetative shoots glandular-hairy.
Distribution Russia (E Siberia), USA (W Alaska).
Taxonomic note (R. glandulosum Small)
This species is very distinctive on account of the leafy peduncles and the form of the corolla. Both subspecies are probably in cultivation.