Within the Prunus angustifolia article...


P watsonii Sarg.

Common Names
Sand Plum

Synonyms
P. angustifolia var. watsonii (Sarg.) Waugh

A deciduous shrub or small tree 6 to 12 ft high, with glabrous, reddish branchlets. Leaves ovate, pointed, decurved, 1 to 1{3/4} in. long, {1/2} to {3/4} in. wide, shallowly round-toothed, dark shining green above, paler below, quite glabrous on both surfaces; stalk {1/4} to {1/3} in. long, grooved, with two glands near the base of the blade. Flowers white, {1/2} in. in diameter, produced in clusters of three or four, each on a slender stalk {1/4} in. long. Fruits round, orange-red, {3/4} in. in diameter, the stone deeply pitted.Native of the central United States, where it is said to form thickets in low, sandy places near streams. It was first recognised as a distinct species by Sargent in 1894, having previously been confused with P. angustifolia, from which is differs in its ‘thicker leaves, thicker skinned fruit, and smaller more deeply pitted stone’. It is very distinct from P. angustifolia in its behaviour under cultivation, thriving well where that species is a total failure. Introduced to Kew in 1897, but unfortunately it is no longer represented there. It flowers in late April and May, but is not one of the most effective plums in this country.

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