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diel's cotoneaster

Swedish cotoneaster

Habit Shrubs, 2–4 m. Stems narrowly erect, spreading; branches distichous, grayish brown, initially tomentose-pilose. Shrubs, 0.4–0.6 m. Stems ± erect or ± procumbent, arching, ends rooting; branches spiraled, green proximally, purple-black distally, initially densely strigose.
Leaves

deciduous;

petiole 2–5 mm, tomentose-pilose;

blade ovate to elliptic or broadly ovate, 9–38 × 7–23 mm, coriaceous or subcoriaceous, base obtuse or cuneate, margins flat, not revolute, veins 2–4, lightly sunken, apex acute or acuminate, abaxial surfaces densely grayish tomentose, adaxial dark green to grayish green, shiny, not glaucous, flat, rarely slightly bulging, between lateral veins, slightly rugose, pilose;

fall leaves bright yellow to orange or red.

persistent;

petiole often red, 1–3 mm, strigose;

blade elliptic, 10–27 × 4–12 mm, coriaceous, base cuneate, margins revolute, veins 4–7, superficial, apex obtuse or acute, rarely emarginate, abaxial surfaces gray-green, initially strigose-villous, midrib often red, adaxial dark green, shiny, not glaucous, flat between lateral veins, initially sparsely long-haired pilose.

Inflorescences

on fertile shoots 10–35 mm with 4 leaves, 2–7(–10)-flowered, compact.

on fertile shoots 8–40 mm with 3 or 4 leaves, 1 or 2(–6)-flowered, compact.

Pedicels

1–3 mm, tomentose-strigose.

1–3.5 mm, initially sparsely pilose.

Flowers

erect, 6–7.5 mm, closed;

hypanthium funnelform, proximally tomentose-strigose, distally tomentose-pilose;

sepals: margins reddish tomentose, borders purple, broad, glabrous, apex cuspidate or apiculate, surfaces pilose;

petals erect-incurved, dark pink to red, base dark red, margins off-white;

stamens 14–20, filaments red to dark red, anthers white;

styles 3 or 4(or 5).

12–13 mm diam.;

buds white;

hypanthium cupulate, initially sparsely pilose;

sepals: margins villous, apex acute, surfaces villous;

petals spreading, white, glabrous;

stamens 15–20, filaments white, anthers dark red-purple;

styles 2–4(or 5).

Pomes

bright red, broadly obovoid, sometimes globose or depressed-globose, 5–9.1 × 5.1–8.8 mm, slightly shiny, not glaucous, pilose;

sepals flat, tomentose;

navel open;

style remnants 1/2–2/3 from base.

red-orange to scarlet, obovoid to subglobose, [4–]7–11 × 7–10 mm, shiny, not glaucous, glabrous or sparsely villous;

sepals depressed to slightly ascending, glabrous or sparsely villous;

navel open;

style remnants at apex.

Pyrenes

3 or 4(or 5).

2–4(or 5) (always some with more than 2).

2n

= 34 (Germany).

Cotoneaster dielsianus

Cotoneaster ×suecicus

Phenology Flowering May–Jun; fruiting Aug–Mar. Flowering May–Jun; fruiting Oct–May.
Habitat Edges of woods, disturbed forests, flood plains, thickets, waste ground, cliffs, meadows, brushy wet prairie remnants Hedges, edges, paths, urban waste ground
Elevation 0–500 m (0–1600 ft) 0–200 m (0–700 ft)
Distribution
from FNA
OR; WA; BC; Asia (China) [Introduced in North America; introduced also in Europe]
[BONAP county map]
from FNA
OR; WA; BC; QC; Europe [Introduced in North America]
[BONAP county map]
Discussion

L. Lingdi and A. R. Brach (2003) included within Cotoneaster dielsianus several taxa recognized here as distinct species, including C. bradyi J. Fryer & E. C. Nelson and C. splendens Flinck & B. Hylmö. Some collections from Oregon approach an undescribed species from China but differ in fruit shape.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Cotoneaster x\suecicus is of garden origin, presumably a cross between C. conspicuus and C. dammeri.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 9, p. 466. FNA vol. 9, p. 460.
Parent taxa Rosaceae > subfam. Amygdaloideae > tribe Maleae > Cotoneaster Rosaceae > subfam. Amygdaloideae > tribe Maleae > Cotoneaster
Sibling taxa
C. adpressus, C. atropurpureus, C. cochleatus, C. conspicuus, C. crispii, C. dammeri, C. divaricatus, C. fangianus, C. franchetii, C. frigidus, C. gamblei, C. hjelmqvistii, C. hodjingensis, C. horizontalis, C. integrifolius, C. lacteus, C. lucidus, C. magnificus, C. melanocarpus, C. miniatus, C. monopyrenus, C. nitens, C. pannosus, C. qungbixiensis, C. rehderi, C. salicifolius, C. simonsii, C. sternianus, C. tengyuehensis, C. transens, C. vestitus, C. villosulus, C. ×suecicus
C. adpressus, C. atropurpureus, C. cochleatus, C. conspicuus, C. crispii, C. dammeri, C. dielsianus, C. divaricatus, C. fangianus, C. franchetii, C. frigidus, C. gamblei, C. hjelmqvistii, C. hodjingensis, C. horizontalis, C. integrifolius, C. lacteus, C. lucidus, C. magnificus, C. melanocarpus, C. miniatus, C. monopyrenus, C. nitens, C. pannosus, C. qungbixiensis, C. rehderi, C. salicifolius, C. simonsii, C. sternianus, C. tengyuehensis, C. transens, C. vestitus, C. villosulus
Name authority E. Pritz ex Diels: Bot. Jahrb. Syst. 29: 385. (1900) Cotoneaster ×suecicus G. Klotz: Beitr. Phytotax. 10: 47. (1982)
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