Prunus fasciculata
Prunus rivularis
desert almond, desert peach, wild almond
creek plum, creek plume, hog plume
with axillary end buds, glabrous or canescent.
with axillary end buds, glabrous.
deciduous;
sessile;
blade oblanceolate to linear, 0.5–2 × 0.1–0.2(–0.4) cm, base long-attenuate, margins nearly entire or obscurely and remotely serrulate in distal 1/3, teeth blunt to sharp, sometimes glandular, apex rounded to acute, surfaces puberulent or glabrous or low-papillate (var. punctata).
deciduous;
petiole 7–21 mm, glabrous or sparsely hairy on adaxial surface, glandular distally, glands 1–4;
blade lanceolate, oblong-lanceolate, or elliptic to narrowly elliptic, usually folded along midribs, 4–11 × 1.5–5 cm, base obtuse to rounded, margins singly to doubly crenate-serrulate, teeth blunt, glandular, glands inconspicuous, blackish, apex usually acuminate, sometimes acute, abaxial surface glabrous or ± hairy along midribs and veins, adaxial usually glabrous, rarely midribs hairy.
solitary flowers or 2-flowered fascicles.
2–4-flowered, umbellate fascicles.
0–4 mm, glabrous.
3–15 mm, glabrous.
unisexual, plants dioecious, blooming at leaf emergence;
hypanthium campanulate, 1.5–3 mm, glabrous externally;
sepals erect-spreading, triangular, 0.7–1 mm, margins entire, surfaces glabrous;
petals white to yellowish, elliptic, obovate, or suborbiculate, 1.4–2.5(–4) mm;
ovaries hairy.
blooming before or at leaf emergence;
hypanthium campanulate, 2–3 mm, usually glabrous, rarely glabrate, externally;
sepals broadly spreading to reflexed, oblong-ovate, 1.5–2.5 mm, margins glandular-toothed, abaxial surface glabrous or sparsely hairy, adaxial densely hairy at bases;
petals white, obovate, 4–7 mm;
ovaries glabrous.
gray to red-brown, ovoid, ± compressed, 7–15 mm, densely puberulent;
hypanthium tardily deciduous;
mesocarps leathery to dry;
stones ovoid, ± flattened.
usually red, sometimes yellowish orange, with white dots, not or only slightly glaucous, globose, 12–25 mm, glabrous;
mesocarps fleshy;
stones ovoid to subglobose, ± flattened.
Prunus fasciculata
Prunus rivularis
Varieties 2 (2 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Prunus munsoniana is here placed in synonymy with P. rivularis, greatly expanding the range of the latter compared to its traditional treatment. Descriptions of P. munsoniana and P. rivularis differ mostly in size of the plants, leaves, and floral structures. As suggested by G. M. Diggs et al. (1999), P. munsoniana is simply a larger version of P. rivularis.
Evidence from analysis of DNA sequences of two nuclear genes in native plums (J. R. Rohrer et al. 2008) indicates that Prunus rivularis may be an allopolyploid. Three plants sequenced from Texas contained alleles seemingly derived from P. angustifolia on the one hand and P. hortulana (or P. murrayana) on the other. Further, two individuals determined as P. munsoniana, one each from Pennsylvania and Texas, had sequences very similar to those of P. rivularis.
Other specimens in herbaria labeled as Prunus munsoniana include hybrids between P. americana and P. angustifolia, as well as individuals of P. hortulana that bloom before the leaves emerge or that sucker freely.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Leaf blades sparsely to densely puberulent, not papillate. | var. fasciculata |
1. Leaf blades glabrous, sometimes papillate. | var. punctata |
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