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Published In: Arbustrum Americanum 111. 1785. (Arbust. Amer.) Name publication detailView in Biodiversity Heritage Library

Project Name Data (Last Modified On 9/22/2017)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Native


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2. Prunus angustifolia Marshall (Chickasaw plum)

P. angustifolia var. variens W. Wight & Hedrick

P. angustifolia var. watsonii (Sarg.) Waugh

Pl. 536 d, e; Map 2472

Plants shrubs or small trees, 3–5 m tall, often suckering to produce thickets. Branches thorny. Twigs glabrous, producing pseudoterminal winter buds (these usually in a cluster of 2 or 3 at the tip). Petioles 2–14 mm, usually sparsely short-hairy on the upper side, rarely entirely glabrous or hairy all around, usually glandless, less commonly with 1 or 2 glands near the tip. Leaf blades 1.5–6.0 cm long, 0.8–2.0 cm wide, more than 2 times as long as wide, lanceolate to oblong-lanceolate or narrowly elliptic, often somewhat arched, sometimes somewhat folded longitudinally, then keeled along the midvein, angled to broadly angled or occasionally rounded at the base, angled or short-tapered to a sharply pointed tip, the margins finely and simply toothed, the blunt, incurved teeth gland-tipped, the upper surface glabrous, the undersurface nearly glabrous, with only a few hairs along the midvein. Inflorescences produced before or as the leaves develop, umbellate clusters of 2–4 flowers per bud, the flower stalks 3–10 mm, glabrous. Flowers with the hypanthium 1–3 mm long, more or less bell-shaped, glabrous. Sepals 1–2 mm long, erect to spreading at flowering, ovate, the margins sparsely hairy, entire, nonglandular, the inner surface hairy, especially toward the base. Petals 3–6 mm, obovate to nearly circular, white. Fruits 15–20 mm long, globose to ellipsoid, shallowly longitudinally grooved on 1 side, the surface red to yellow, glabrous, slightly glaucous, the fleshy layer well-developed, the stone ovoid, somewhat flattened, the surface roughened or somewhat pitted. 2n=16. March–April.

Scattered, mostly south of the Missouri River (eastern [mostly southeastern] U.S. west to Colorado, New Mexico, and California). Swales of upland prairies, sand prairies, savannas, and openings of mesic upland forests; also pastures, ditches, old mines, railroads, roadsides, and open, disturbed areas.

Prunus angustifolia is a relatively distinctive plum species because of its relatively small, glandular-margined leaves that are folded lengthwise during development. For a discussion of hybridization with P. hortulana, see the treatment of that species.



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