Prunus subcordata |
Prunus yedoensis |
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Klamath plum, Oregon plum, Pacific plum, Sierra or Klamath or Pacific plume, Sierra plum, western plum |
Yoshino cherry |
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Habit | Shrubs or trees, often suckering, 10–30(–60) dm, sometimes thorny. | Trees, not suckering, 40–80(–160) dm, not thorny. |
Twigs | with axillary end buds, glabrous or hairy. |
with terminal end buds, sparsely hairy. |
Leaves | deciduous; petiole 4–18 mm, glabrous or hairy, usually glandular distally, glands 1–3, discoid; blade elliptic, oblong-ovate, or suborbiculate, 2–5(–6.5) × 1.3–3.5(–4.5) cm, base rounded or subcordate, margins singly to doubly serrulate, teeth blunt, glandular, apex usually obtuse to rounded, rarely acute, abaxial surface glabrous or hairy, adaxial glabrous or appressed-hairy. |
deciduous; petiole 10–20 mm, hairy, sometimes glandular distally, glands 1–2; blade elliptic-ovate to obovate, 5–12 × 2.5–7 cm, base rounded, margins doubly serrate, teeth aristate, glandular, apex acuminate, abaxial surface hairy along midribs and veins, adaxial glabrous. |
Inflorescences | 2–5-flowered, umbellate fascicles. |
2–6-flowered, corymbs; central axes 4–8(–20) mm. |
Pedicels | 5–15 mm, glabrous or hairy. |
15–25 mm (subtended by leafy bracts), hairy. |
Flowers | blooming at leaf emergence; hypanthium campanulate, 2–3.5 mm, glabrous or hairy externally; sepals broadly spreading to reflexed, obovate, 2.2–4(–5) mm, margins glandular-toothed, sometimes obscurely so, sometimes ciliate, surfaces glabrous or hairy; petals white, oblong-obovate, 5–10 mm; ovaries usually glabrous, rarely hairy. |
blooming before leaf emergence; hypanthium tubular, 7–8 mm, hairy externally; sepals spreading, ovate-lanceolate, 4–5 mm, margins glandular-toothed, abaxial surface hairy, adaxial sparsely hairy; petals white or pink, broadly elliptic to obovate, 13–15 mm; ovaries glabrous. |
Drupes | usually red to reddish purple, sometimes yellow, globose to ellipsoid, 15–25 mm, usually glabrous, rarely puberulent; mesocarps fleshy; stones ovoid, ± flattened. |
black, subglobose, 7–12 mm, glabrous; mesocarps fleshy; stones ellipsoid, not flattened. |
2n | = 16 (Japan). |
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Prunus subcordata |
Prunus yedoensis |
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Phenology | Flowering Mar–May; fruiting Aug–Sep. | Flowering Mar–Apr; fruiting May. |
Habitat | Stream banks, dry rocky slopes, chaparral, pine-oak and juniper-oak woodlands | Abandoned plantings, disturbed sites |
Elevation | 100–1900 m (300–6200 ft) | 0–200 m (0–700 ft) |
Distribution |
CA; OR
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CA; DC; WA; e Asia (Japan) [Introduced in North America] |
Discussion | Prunus subcordata shows variation in color, size, indument, and palatability of fruits, which has been the basis for recognition of taxonomic segregates. Variety kelloggii was described as a larger plant with less hairy foliage than in typical P. subcordata, and its fruits are yellow, larger, sweeter, and more pulpy. Variety rubicunda is a smaller shrub with bright red, bitter fruits. Most noteworthy is var. oregana with densely hairy ovaries and puberulent fruits, recorded only from the sparsely inhabited border region between northeastern California and adjacent Oregon. Specimens in herbaria are few and recent collections are lacking. The assignment of P. texana with hairy fruits to the plums (J. Shaw and R. L. Small 2005) makes this variant all the more interesting. Field study and collection followed by morphologic, genetic, and molecular study are needed to clarify its systematic position and significance. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 9, p. 377. | FNA vol. 9, p. 369. |
Parent taxa | Rosaceae > subfam. Amygdaloideae > tribe Amygdaleae > Prunus | Rosaceae > subfam. Amygdaloideae > tribe Amygdaleae > Prunus |
Sibling taxa | ||
Synonyms | P. subcordata var. kelloggii, P. subcordata var. oregana, P. subcordata var. rubicunda | |
Name authority | Bentham: Pl. Hartw., 308. (1849) | Matsumura: Bot. Mag. (Tokyo) 15: 100. (1901) |
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