Cotoneaster dielsianus |
Rosaceae subfam. amygdaloideae |
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diel's cotoneaster |
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Habit | Shrubs, 2–4 m. Stems narrowly erect, spreading; branches distichous, grayish brown, initially tomentose-pilose. | Shrubs or trees, sometimes subshrubs or herbs. |
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. |
alternate, sometimes opposite, simple, sometimes pinnately compound; stipules present or absent. |
Inflorescences | on fertile shoots 10–35 mm with 4 leaves, 2–7(–10)-flowered, compact. |
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Pedicels | 1–3 mm, tomentose-strigose. |
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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). |
torus absent or minute; carpels 1–5(–8), distinct or +/- connate (Maleae), free or +/- adnate to hypanthium (many Maleae), styles distinct or +/- connate (some Maleae); ovules (1 or)2(–5+), collateral, clustered, or biseriate. |
Fruits | follicles aggregated or not, capsules, drupes aggregated or not, aggregated drupelets, pomes, or aggregated nutlets, rarely achenes or aggregated achenes; styles persistent or deciduous, not elongate (elongate in Gillenieae). |
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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. |
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Pyrenes | 3 or 4(or 5). |
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x | = 8, 9, 15, 17. |
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Cotoneaster dielsianus |
Rosaceae subfam. amygdaloideae |
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Phenology | Flowering May–Jun; fruiting Aug–Mar. | |
Habitat | Edges of woods, disturbed forests, flood plains, thickets, waste ground, cliffs, meadows, brushy wet prairie remnants | |
Elevation | 0–500 m (0–1600 ft) | |
Distribution |
OR; WA; BC; Asia (China) [Introduced in North America; introduced also in Europe] |
HI; North America; Mexico; Central America; South America; Europe; Asia; Africa; Atlantic Islands (Madeira); Australia |
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.) |
Cyanogenic glycosides are usually present in Amygdaloideae; sorbitol is present. The name Amygdaloideae Arnott (1832) has priority over Spiraeoideae Arnott (1832), used by D. Potter et al. (2007), because Amygdalaceae (1820) is an earlier conserved name. Tribes 9, genera 55, species ca. 1300 (9 tribes, 38 genera, 361 species, including 20 hybrids, in the flora) (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 466. | FNA vol. 9, p. 345. |
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Sibling taxa | ||
Subordinate taxa | ||
Name authority | E. Pritz ex Diels: Bot. Jahrb. Syst. 29: 385. (1900) | Arnott: Botany, 107. (1832) |
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