Prunus nigra |
Prunus ilicifolia |
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black plum, Canada plum, Canadian plum, prunier noir |
Catalina cherry, evergreen cherry, holly leaf cherry, islay |
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Habit | Shrubs or trees, sometimes suckering, 30–90 dm, moderately thorny. | Shrubs or trees, sometimes suckering, 10–150 dm, not thorny. | ||||
Twigs | with axillary end buds, usually glabrous, rarely hairy. |
with terminal end buds, glabrous. |
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Leaves | deciduous; petiole 8–22 mm, glabrate with hairs adaxially, sometimes glandular distally, glands 1–3, discoid; blade broadly elliptic to obovate, (5–)7–11 × 3–6.5 cm, base obtuse to rounded or subcordate, margins doubly crenate-serrate, teeth blunt, glandular, apex abruptly acuminate, abaxial surface hairy along midribs and major veins, adaxial glabrous. |
persistent; petiole 3–25 mm, glabrous, eglandular; blade oblong-ovate to ovate-lanceolate or ovate to suborbiculate, 1.6–12 × 1.2–5(–7) cm, base usually broadly rounded to subcordate, sometimes obtuse, margins spinose-dentate to spinose-serrulate or entire, sometimes undulate, teeth sharp, callus-tipped, sometimes glandular at leaf base, apex acute to acuminate, surfaces glabrous, abaxial eglandular, if glands present, restricted to margins. |
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Inflorescences | 2–4-flowered, umbellate fascicles. |
15–40-flowered, racemes; central axes 30–80 mm, leafless at bases. |
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Pedicels | 7–20 mm, usually glabrous, rarely hairy. |
1–5 mm, glabrous. |
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Flowers | blooming before or at leaf emergence; hypanthium red-tinged, obconic, 3–4(–5) mm, usually glabrous, rarely hairy externally; sepals broadly spreading to reflexed, ovate, 2–4(–5) mm, margins glandular-toothed, abaxial surface usually glabrous, rarely sparsely hairy, adaxial glabrous or hairy; petals white, often fading to pink, suborbiculate to oblong-obovate, 8–13 mm; ovaries glabrous. |
blooming before leaf emergence; hypanthium cupulate, 2–3 mm, glabrous externally; sepals erect to spreading, triangular, 0.7–1.2 mm, margins entire, surfaces usually glabrous, rarely with scattered hairs; petals white to yellowish, elliptic, obovate, or suborbiculate, 1–3 mm; ovaries glabrous. |
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Drupes | red, orange, or yellowish, barely glaucous, globose to ellipsoid, 15–30 mm, glabrous; mesocarps fleshy; stones ovoid-ellipsoid, strongly flattened. |
dark red to purple or blue-black, obovoid or ellipsoid to globose, 12–25 mm, glabrous; mesocarps leathery; stones subglobose to ellipsoid, ± flattened. |
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2n | = 16. |
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Prunus nigra |
Prunus ilicifolia |
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Phenology | Flowering Apr–Jun; fruiting Aug–Sep. | |||||
Habitat | Borders of deciduous woods, bottomland forests, roadside thickets | |||||
Elevation | 10–800 m (0–2600 ft) | |||||
Distribution |
CT; IA; IL; IN; MA; ME; MI; MN; ND; NH; NY; OH; VT; WI; MB; NB; NS; ON; QC
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CA; nw Mexico
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Discussion | In the northeastern United States and adjacent Canada, Prunus nigra co-occurs with, and is sometimes confused with, P. americana, despite being distinct in both flower and leaf. The red-tinged hypanthia and sepals of P. nigra give the entire inflorescence a pinkish coloration even when the petals are pure white, and the sepals bear obvious glandular teeth along their margins; in P. americana the hypanthia and sepals are green and the sepals bear relatively few glandular teeth or are eglandular. The leaf marginal teeth of P. nigra are rounded and bear glands at their tips or have callus scars where the glands fell off; those of P. americana are acute and eglandular; some may have a callused tip. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 9, p. 379. | FNA vol. 9, p. 362. | ||||
Parent taxa | Rosaceae > subfam. Amygdaloideae > tribe Amygdaleae > Prunus | Rosaceae > subfam. Amygdaloideae > tribe Amygdaleae > Prunus | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Cerasus ilicifolia | |||||
Name authority | Aiton: Hort. Kew. 2: 165. (1789) | (Nuttall ex Hooker & Arnott) D. Dietrich: Syn. Pl. 3: 43. (1842) | ||||
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