Dwarf shrub, 0.3–1.2 m. Leaves 3.5–9 × 1–3 cm, elliptic, lower surface with a green epidermis and a thin discontinuous whitish to brown indumentum; petioles usually tomentose, sometimes also weakly setose. Flowers 2–6, in a tight truss; calyx 2–7 mm, cupular when well-developed; corolla not fleshy, pink to rose-carmine, tubular-campanulate to campanulate, 25–40 mm; ovary predominantly glandular to predominantly tomentose, abruptly contracted into the glabrous style. Flowering April-May. Royal Horticultural Society (1997)
Distribution China border between Tibet & Yunnan
Habitat 3,350–4,250 m
RHS Hardiness Rating H5
Conservation status Least concern (LC)
An evergreen shrub up to 6 ft high in the wild. Leaves thinly leathery, oblong-elliptic to oblong-obovate, rounded at the apex, up to 27⁄8 in. long and 1 in. wide, glabrous above when mature, underside clad with a ‘very thin discontinuous mealy indumentum composed of branched or star-like hairs … scattered over the undersurface of the leaf. At the same time the undersurface of the leaf is very minutely papillate and has a greenish brown appearance’ (Cowan, Notes R.B.G. Edin., Vol. 20, p. 77). Inflorescence a terminal umbel of three to six flowers, opening in April or May (later in some forms). Calyx fleshy at the base, up to 1⁄4 in. deep. Corolla tubular-campanulate, 11⁄2 in. long, crimson or pink. Stamens downy at the base. Ovary tomentose and glandular; style glabrous. (s. Neriiflorum ss. Sanguineum)
R. eudoxum is a native of N.W. Yunnan and bordering parts of Tibet (Tsarong) on the Mekong-Salween and Salween-Irrawaddy divides and was introduced by Forrest. It received an Award of Merit when shown by E. H. M. and P. A. Cox on April 26, 1960 (a form with flowers of the shade of pink known as Solferino Purple, with a deeper crimson tinge at the base).
subsp. brunneifolium (Balf. f. & Forr.) Cowan R. brunneifolium Balf. f. & Forr. – Differing from the typical state mainly in having the ovary eglandular.
The Edinburgh revision recognises only three varieties, not subspecies, here:
var. eudoxum. – The typical variety with a mainly glandular ovary.
var. brunneifolium (Balf.f. & Forr.) Chamberlain – Leaves 23⁄4 to 31⁄2 in. long; indumentum brownish. Ovary mainly tomentose.
var. mesopolium (Balf.f. & Forr.) Chamberlain – Leaves 13⁄8 to 31⁄2 in. long; indumentum whitish. Ovary mainly tomentose.
For synonymy, see Rev. 2, pp. 401–3.
R. brunneifolium Balf.f. & Forrest
Ovary predominantly tomentose; leaves 7–9cm, indumentum brownish; corolla c.40mm. Royal Horticultural Society (1997)
R. trichomiscum Balf.f. & Forrest
R. trichophlebium Balf.f. & Forrest
Ovary predominantly glandular. Royal Horticultural Society (1997)
AM 1960 (E.H.M. & P.A. Cox, Glendoick, Perth); flowers Solferino Purple with a basal crimson fringe.
R. epipastum Balf.f. & Forrest
Ovary predominantly tomentose; leaves 3.5–7 cm, indumentum whitish; corolla 30–35 mm. Royal Horticultural Society (1997)
A variable species that may have arisen as a hybrid of R. sanguineum. It is also allied to R. temenium (q.v.). Royal Horticultural Society (1997)