One-stoned cotoneaster

Cotoneaster hebephyllus Diels var. monopyrenus W. W. Smith, Notes Roy. Bot. Gard. Edinburgh 10: 23. 1917 (as hebephylla var. monopyrena)

Shrubs or trees, 3–5 m. Stems loosely erect, arching, spreading; branches spiraled, maroon, ˂lenticellate˃, initially pilose-strigose. Leaves deciduous; petiole 5–9 mm, pilose-strigose; blade elliptic, broadly elliptic, or broadly obovate, sometimes suborbiculate, 25–58 x 15–40 mm, subcoriaceous, base obtuse or cuneate, margins flat, veins 4–6, slightly sunken, apex obtuse or truncate, seldom acute, abaxial surfaces color not recorded, ˂reticulate˃, tomentose-pilose, later thinning, adaxial dark green, dull, coating not recorded, flat between lateral veins, glabrescent; ˂fall leaves pale yellowish green˃. Inflorescences on fertile shoots 30–50 mm with 3–4 leaves, 7–20-flowered, lax. Pedicels 2–5 mm, pilose-strigose. Flowers 10–12 mm diam., buds white, hypanthium campanulate to cupulate, sparsely pilose-strigose; sepals: margins ˂reddish˃, villous, ˂borders maroon-tipped, membranous˃, apex acute, acuminate, or obtuse, surfaces sparsely pilose-strigose; petals spreading, white, sometimes with hair tuft; stamens (15–)20, filaments white; anthers purple to blackish purple; styles 1(or 2). Pomes dark red or ruby to maroon, maturing dark purple or purple-black, obovoid, rarely globose or ellipsoid, 9–12.5 x 8.5–11.5 mm, dull, glaucous, glabrous; sepals flat, ˂margins sparsely hairy˃, sparsely hairy to glabrate; navel open; style remnants at apex. Pyrenes 1(or 2).

Flowering May–Jun; fruiting Jul–Nov. Thickets; 0–200 m; introduced; Wash.; Asia (China); introduced also in Europe.

L. Lingdi and A. R. Brach (2003) synonymized Cotoneaster monopyrenus with C. hebephyllus (as C. hebephyllus var. hebephyllus).