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FNA | Family List | FNA Vol. 9 | Rosaceae | Cotoneaster

3. Cotoneaster lacteus W. W. Smith, Notes Roy. Bot. Gard. Edinburgh. 10: 23. 1917.
[(as lactea)]

Cream-flowered or late or Parney's cotoneaster

Shrubs or trees, 2–9 m. Stems erect, arching, spreading, ˂slender˃; branches spiraled or distichous, purple-black, initially yellowish tomentose-villous. Leaves persistent; petiole 5–8 mm, initially tomentose; blade obovate to elliptic, rarely broadly elliptic, (26–)40–85(–120) x (13–)19–45(–60) mm, coriaceous, base cuneate, margins flat or slightly revolute, veins 7–9, deeply sunken, apex short-tapered, acute, acuminate, or obtuse, abaxial surfaces initially yellowish tomentose-villous, adaxial dark green, dull or slightly shiny, not glaucous, bulging slightly between lateral veins, initially sparsely pilose. Inflorescences on fertile shoots 45–100 mm with 4 leaves, 20–150-flowered, lax. Pedicels 1–5 mm, tomentose-strigose. Flowers 6–9 mm diam.; buds creamy white, sometimes slightly pinkish; hypanthium funnelform, tomentose-strigose; sepals: margins villous, apex cuspidate, surfaces tomentose; petals spreading, creamy white, sometimes with hair tuft; stamens 20, filaments white, anthers red-purple; styles 2. Pomes crimson, broadly obovoid, subglobose, or globose, 6.5–8.6 x 6.5–7.6 mm, shiny, not glaucous, sparsely villous; sepals depressed or slightly ascending, tomentose; navel slightly open or obscured by sepals; style remnants near apex. Pyrenes 2. 2n = 68 (Germany).

Flowering May–Jul; fruiting Nov–Apr. Thickets, disturbed forests, edges, urban waste ground, stonework, grassy bluffs, canyons, pond shores; 0–700 m; introduced; B.C.; Calif., Oreg., Wash.; Asia (China); introduced also in Europe, Pacific Islands (New Zealand).

Cotoneaster lacteus sometimes is synonymized with C. coriaceus Franchet (for example, L. Lingdi and A. R. Brach 2003). As treated here, plants of this species are identified by their fertile shoots to 10 cm, scarcely shiny leaves to 120 x 60 mm with adaxial surfaces bulging between lateral veins, flowers to 150 in lax inflorescences, 6–9 mm diam. with cream petals, and larger, later-ripening fruits. Plants of C. coriaceus have fertile shoots to 5 cm, shiny leaves to 52 x 24 mm with flat adaxial surfaces, flowers to 50 in compact inflorescences, 9–10 mm diam. with white petals, and smaller, earlier-ripening fruits.


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