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diel's cotoneaster

Stern's cotoneaster

Habit Shrubs, 2–4 m. Stems narrowly erect, spreading; branches distichous, grayish brown, initially tomentose-pilose. Shrubs, 1.5–4 m. Stems erect, arching, stiff; branches distichous, maroon, whitish tomentose-pilose.
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 4–6 mm, tomentose-pilose;

blade elliptic to broadly ovate, (18–)25–52(–56) x (12–)16–28(–34) mm, coriaceous, base obtuse or cuneate, margins recurved, veins 4–6, deeply sunken, apex acute or acuminate, abaxial surfaces whitish tomentose, adaxial dark green, slightly shiny, not glaucous, on vigorous shoots usually bulging slightly between lateral veins (unless shaded), very rugose, pilose.

Inflorescences

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

on fertile shoots 25–70 mm with 3–5 leaves, 7–20-flowered, compact.

Pedicels

1–3 mm, tomentose-strigose.

1–4 mm, tomentose-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).

(5–)6–7.5 mm, opening small;

hypanthium cupulate, silky tomentose;

sepals: margins villous, borders purple, glabrous, apex acute or acuminate, surfaces silky tomentose;

petals erect-incurved, pink to red, base dark red (with minute black dots), margins erect-incurved, pink or white;

stamens 20, filaments red, distally pink or whitish, anthers white, sutures pink-tinged;

styles (2 or)3 or 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.

bright orange, eventually orange-red, subglobose to depressed-globose or globose, 6–10 × 6–10 mm, base rounded, shiny, not glaucous, pilose;

sepals flat, tomentose; forming 5-pointed star over closed navel;

style remnants 3/4 from base.

Pyrenes

3 or 4(or 5).

(2 or)3 or 4(or 5).

Cotoneaster dielsianus

Cotoneaster sternianus

Phenology Flowering May–Jun; fruiting Aug–Mar. Flowering Jun–Jul; fruiting Oct–Jan.
Habitat Edges of woods, disturbed forests, flood plains, thickets, waste ground, cliffs, meadows, brushy wet prairie remnants Mossy cliffs, thickets, hedges, 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
BC; Asia (China, Myanmar) [Introduced in North America; introduced also in Europe, Pacific Islands (New Zealand)]
[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 sternianus is similar to C. franchetii, a species with more elongated pomes, uniformly pink or purple anthers, and less textured leaves.

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

Source FNA vol. 9, p. 466. FNA vol. 9, p. 466.
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. tengyuehensis, C. transens, C. vestitus, C. villosulus, C. ×suecicus
Synonyms C. franchetii var. sternianus
Name authority E. Pritz ex Diels: Bot. Jahrb. Syst. 29: 385. (1900) (Turrill) Boom: Jaarb. Ned. Dendrol. Ver. 20: 81. (1957)
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