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FNA | Family List | FNA Vol. 9 | Rosaceae | Prunus

44. Prunus murrayana E. J. Palmer, J. Arnold Arbor. 10: 38. 1929.

Murray’s plum

Prunus rivularis Scheele var. pubescens Enquist

Shrubs, usually suckering, 5–30(–50) dm, ± thorny. Twigs with axillary end buds, hairy. Leaves deciduous; petiole 8–16 mm, usually hairy on both surfaces, sometimes only on adaxial surface, usually glandular distally, glands 1–4; blade lanceolate to elliptic or ovate, ˂usually folded along midribs˃, 3.5–7.5 × 1.5–3.5 cm, base obtuse to rounded, margins singly to doubly crenate-serrate, teeth blunt, glandular, apex usually acuminate, sometimes acute, abaxial surface glabrous or ± hairy along midribs and veins, adaxial glabrous. Inflorescences 1–4-flowered, umbellate fascicles. Pedicels 4–14 mm, hairy. Flowers blooming at leaf emergence; hypanthium campanulate, 2–2.5 mm, hairy externally; sepals erect to reflexed, ovate, 1.5–2 mm, margins glandular-toothed, abaxial surface glabrate or hairy, adaxial densely hairy at bases; petals white, obovate, 4–8 mm; ovaries glabrous. Drupes red with white dots, ˂slightly to quite glaucous˃, globose, 10–18 mm, glabrous; mesocarps fleshy; stones ovoid, ± flattened.

Flowering Mar–Apr; fruiting Jul–Aug. Rocky stream banks, canyons, dry washes, fence rows; 500–1500 m; Tex.

Prunus murrayana was long known only from trans-Pecos Texas. M. F. Enquist (1997) expanded the range by recognizing the similarity of these plants to plants from the Edwards Plateau, which he described as a hairy variety of P. rivularis and placed P. murrayana in synonymy. Sequence analysis of DNA from some of the same hairy plants collected by Enquist indicate that these plants are distinct from P. rivularis and are most similar to P. hortulana (J. R. Rohrer et al. 2008). Prunus murrayana is a smaller plant than P. hortulana, with smaller leaves and fruits. Also, P. murrayana suckers to form shrubby thickets; P. hortulana generally forms single trees. The twigs, pedicels, and hypanthium exteriors are hairy in P. murrayana and glabrous in P. hortulana.


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