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Mclaren's cotoneaster

prostrate cotoneaster, purple-flower cotoneaster, purple-flowering cotoneaster

Habit Shrubs or trees, 4–6 m. Stems loosely erect, spreading, stiff; branches spiraled, maroon, minutely verrucose, initially pilose-strigose. Shrubs, 0.5–1 m. Stems ascending to erect, spreading horizontally, arching; branches divaricate, sometimes distichous, red-purple, initially densely yellowish strigose-villous.
Leaves

deciduous;

petiole 4–6 mm, densely pilose-strigose;

blade on sterile shoots elliptic, (35–)50–80(–103) x (13–)17–37(–42) mm, chartaceous, margins flat, base cuneate, veins 6–10, superficial or lightly sunken, apex acute or obtuse, abaxial surfaces color not recorded, villose-strigose, adaxial brownish green, soon green, dull, coating not recorded, flat between lateral veins, glabrate;

fall leaves yellow.

deciduous;

petiole 1–2 mm, yellow-villous;

blade elliptic, on vigorous shoots obovate-orbiculate, 9–14 × 8–12 mm, chartaceous, base obtuse or acute, margins flat or slightly undulate, veins 2 or 3, superficial or slightly sunken, apex obtuse or truncate, mucronulate, abaxial surfaces shiny, sparsely golden yellow-pilose, adaxial green to dark green, shiny, not glaucous, flat or scarcely bulging between lateral veins, glabrous;

fall leaves ruby red.

Inflorescences

on fertile shoots 40–50 mm with 2–4 leaves, 10–25-flowered, lax.

on fertile shoots 9–11 mm with 3 leaves, (1 or)2 or 3-flowered, compact.

Pedicels

3–5 mm, densely pilose-strigose.

0.2–1 mm, pilose.

Flowers

10–12 mm diam.;

buds white;

hypanthium cupulate, villose-strigose;

sepals: margins villous, apex acute, surfaces sparsely villous;

petals spreading, white, with large hair tuft;

stamens (16–)20, filaments white, anthers black, styles 1 or 2.

6 mm, closed or nearly so;

hypanthium funnelform, sparsely yellow-pilose-strigose;

sepals: margins yellow-villous, apex green and red-purple, acuminate or acute, surfaces sparsely pilose;

petals erect-incurved, dark red, base purple-black, margins narrowly white;

stamens 10–14, filaments dark red to dark purple-red, white distally, anthers white [pink-tinged];

styles 2 or 3(or 4).

Pomes

maroon to purple-black, obovoid to elliptic-obovoid, 9–12 × 9–10 mm, slightly shiny, glaucous, sometimes sparsely villous;

sepals flat, margins glabrous, sparsely villous;

navel slightly open;

style remnants 9/10 from base.

bright red, usually broadly obovoid, sometimes obovoid, 7–8 × 7–8 mm, shiny, not glaucous, glabrate;

sepals suberect, margins villous, sparsely pilose;

navel open;

style remnants 3/4 from base.

Pyrenes

1 or 2.

2 or 3(or 4).

Cotoneaster transens

Cotoneaster atropurpureus

Phenology Flowering Jun; fruiting Oct–Nov. Flowering May; fruiting Sep–Jan.
Habitat Thickets Thickets, rock roadcuts, paths, edges of disturbed forests
Elevation 0–50 m (0–200 ft) 0–400 m (0–1300 ft)
Distribution
from FNA
WA; Asia (China) [Introduced in North America; introduced also in Europe]
[BONAP county map]
from FNA
NY; WA; Asia (China) [Introduced in North America; introduced also in Europe]
[BONAP county map]
Discussion

L. Lingdi and A. R. Brach (2003) synonymized Cotoneaster transens with C. glaucophyllus Franchet (as C. glaucophyllus var. glaucophyllus). Cotoneaster transens is a deciduous species with purple-black pomes and is not closely related to C. glaucophyllus, an evergreen species with smaller leaves, smaller red pomes, and smaller flowers, among other differences.

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

Although treated as synonymous with Cotoneaster horizontalis by L. Lingdi and A. R. Brach (2003), C. atropurpureus is separated by having somewhat thinner leaves on vigorous shoots that tend to be obovate instead of broadly elliptic, with obtuse to truncate apices and sometimes slightly wavy margins. It also tends towards less regular branching and somewhat darker petals and filaments.

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

Source FNA vol. 9, p. 457. FNA vol. 9, p. 461.
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. 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. vestitus, C. villosulus, C. ×suecicus
C. adpressus, 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, C. ×suecicus
Name authority G. Klotz: Wiss. Z. Friedrich-Schiller-Univ. Jena, Math.-Naturwiss. Reihe 17(3): 337, fig. 4. (1968) Flinck & B. Hylmö: Watsonia 18: 311. (1991)
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