Physocarpus monogynus |
Rosaceae subfam. amygdaloideae |
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low ninebark, mountain nine-bark |
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Habit | Shrubs, 10 dm. | Shrubs or trees, sometimes subshrubs or herbs. |
Stems | often decumbent, spreading, reddish brown becoming dark gray, glabrous or sparsely stellate-hairy. |
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Leaves | stipules linear to narrowly elliptic or subulate, 4–5 × 1 mm, base attenuate, apex acute; petiole 0.5–2.2 cm; blade broadly ovate, 1.5–4 × 2–4.5 cm, sometimes wider than long, base usually truncate to cordate, rarely broadly cuneate, 0 or 1–5-lobed, margins doubly crenate to doubly serrate, apex rounded to obtuse, surfaces glabrous or sparsely stellate-hairy. |
alternate, sometimes opposite, simple, sometimes pinnately compound; stipules present or absent. |
Inflorescences | 10(–15)–30-flowered, fairly dense, hemispheric racemes, 4 cm diam.; bracts linear to narrowly elliptic or narrowly obovate, 2–4 mm, apex acute, rarely 2-fid. |
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Pedicels | 8–18 mm, sparsely to moderately stellate-hairy. |
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Flowers | 8–10 mm diam.; hypanthium cup-shaped, 1.7–2 mm, sparsely to moderately stellate-hairy; sepals triangular to ovate, 3 mm, apex gland-tipped, surfaces sparsely to moderately stellate-hairy; petals white, broadly elliptic to orbiculate, 4.5 × 4 mm; stamens 20–40, ± equal to petals; carpels (1)2(3), connate at least 1/2 their lengths, densely stellate-hairy. |
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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Seeds | 1–3, pyriform, 2–2.5 mm. |
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Follicles | (1)2(3), inflated, 2.5 mm (lengths shorter than sepals), densely stellate-hairy, hairs white; styles 3.5 mm. |
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x | = 8, 9, 15, 17. |
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2n | = 18. |
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Physocarpus monogynus |
Rosaceae subfam. amygdaloideae |
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Phenology | Flowering May–Aug; fruiting Jul–Oct. | |
Habitat | Open rocky wooded slopes, seepage ledges, canyons | |
Elevation | 1800–2600 m (5900–8500 ft) | |
Distribution |
AZ; CO; MT; NM; NV; OK; SD; TX; UT; WY
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HI; North America; Mexico; Central America; South America; Europe; Asia; Africa; Atlantic Islands (Madeira); Australia |
Discussion | 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.) |
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Source | FNA vol. 9, p. 350. | FNA vol. 9, p. 345. |
Parent taxa | Rosaceae > subfam. Amygdaloideae > tribe Neillieae > Physocarpus | Rosaceae |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Spiraea monogyna | |
Name authority | (Torrey) J. M. Coulter: Contr. U.S. Natl. Herb. 2: 104. (1891) | Arnott: Botany, 107. (1832) |
Web links |