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diel's cotoneaster

one-stone cotoneaster

Habit Shrubs, 2–4 m. Stems narrowly erect, spreading; branches distichous, grayish brown, initially tomentose-pilose. Shrubs or trees, 3–5 m. Stems loosely erect, arching, spreading; branches spiraled, maroon, lenticellate, initially pilose-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.

deciduous;

petiole 5–9 mm, pilose-strigose;

blade elliptic, broadly elliptic, or broadly obovate, sometimes suborbiculate, 25–58 × 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 10–35 mm with 4 leaves, 2–7(–10)-flowered, compact.

on fertile shoots 30–50 mm with 3–4 leaves, 7–20-flowered, lax.

Pedicels

1–3 mm, tomentose-strigose.

2–5 mm, pilose-strigose.

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).

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

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.

dark red or ruby to maroon, maturing dark purple or purple-black, obovoid, rarely globose or ellipsoid, 9–12.5 × 8.5–11.5 mm, dull, glaucous, glabrous;

sepals flat, margins sparsely hairy, sparsely hairy to glabrate;

navel open;

style remnants at apex.

Pyrenes

3 or 4(or 5).

1(or 2).

Cotoneaster dielsianus

Cotoneaster monopyrenus

Phenology Flowering May–Jun; fruiting Aug–Mar. Flowering May–Jun; fruiting Jul–Nov.
Habitat Edges of woods, disturbed forests, flood plains, thickets, waste ground, cliffs, meadows, brushy wet prairie remnants Thickets
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
WA; Asia (China) [Introduced in North America; introduced also in Europe]
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.)

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

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

Source FNA vol. 9, p. 466. FNA vol. 9, p. 457.
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. nitens, C. pannosus, C. qungbixiensis, C. rehderi, C. salicifolius, C. simonsii, C. sternianus, C. tengyuehensis, C. transens, C. vestitus, C. villosulus, C. ×suecicus
Synonyms C. hebephyllus var. monopyrenus
Name authority E. Pritz ex Diels: Bot. Jahrb. Syst. 29: 385. (1900) (W. W. Smith) Flinck & B. Hylmö: Bot. Not. 119: 459. (1966)
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