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diel's cotoneaster

tree cotoneaster

Habit Shrubs, 2–4 m. Stems narrowly erect, spreading; branches distichous, grayish brown, initially tomentose-pilose. Shrubs or trees, 5–15 m. Stems loosely erect, spreading; branches spiraled, dark brown, initially downy.
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.

deciduous;

petiole 5–8 mm, densely villose to tomentose;

blade narrowly elliptic (to lance-elliptic or narrowly obovate), 55–150 × 19–55 mm, membranous, base cuneate, margins flat, veins 6–10, superficial or slightly sunken, apex acute, abaxial surfaces color not recorded, villous at least near midvein, adaxial green, dull, coating not recorded, flat between lateral veins, glabrous except villous midrib.

Inflorescences

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

on fertile shoots 60–80 mm with 2–4 leaves, 20–60-flowered, lax.

Pedicels

1–3 mm, tomentose-strigose.

length not recorded, densely tomentose.

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).

6–7 mm diam.;

buds white;

hypanthium cupulate [subcylindric], tomentose;

sepals: margins tomentose, apex acute, surfaces densely villous;

petals spreading, white, glabrous or with hair tuft;

stamens 20, filaments white, anthers purple;

styles 2.

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.

bright red, subglobose to ellipsoid, 4–6 × 4–5 mm, shiny, not glaucous, sparsely villous;

sepals erect or ascending, margins tomentose, densely villous;

navel hidden;

style remnants near apex.

Pyrenes

3 or 4(or 5).

2.

2n

= 34 (India).

Cotoneaster dielsianus

Cotoneaster frigidus

Phenology Flowering May–Jun; fruiting Aug–Mar. Flowering May–Jun; fruiting Sep–Oct.
Habitat Edges of woods, disturbed forests, flood plains, thickets, waste ground, cliffs, meadows, brushy wet prairie remnants North-facing canyon slopes
Elevation 0–500 m (0–1600 ft) 0–500 m (0–1600 ft)
Distribution
from FNA
OR; WA; BC; Asia (China) [Introduced in North America; introduced also in Europe]
[BONAP county map]
from FNA
CA; Asia (Himalaya Mountains) [Introduced in North America; introduced also in Europe]
[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.)

Reports of Cotoneaster frigidus from Washington (F. C. Weinmann 2000; A. L. Jacobson 2001; J. T. Kartesz 2006) are here referred to C. gamblei, plants having larger fruits tending to be obovoid, less densely pubescent inflorescences, and with thicker, more persistent leaves.

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

Source FNA vol. 9, p. 466. FNA vol. 9, p. 456.
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. 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
Name authority E. Pritz ex Diels: Bot. Jahrb. Syst. 29: 385. (1900) Wallich ex Lindley: Edwards's Bot. Reg. 15: plate 1229. (1829)
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