18. Prunus minutiflora Engelmann ex A. Gray, Boston J. Nat. Hist. 6: 185. 1850.
Shrubs, suckering, ˂much branched˃, 10–20 dm, weakly thorny. Twigs with axillary end buds, canescent. Leaves deciduous; petiole 1–2(–6) mm, glabrous, eglandular; blade elliptic or obovate, 0.5–1.6(–3.5) × 0.3–0.8(–2.1) cm, base cuneate, margins usually entire, sometimes irregularly serrulate (sometimes dentate on long shoots), teeth sharp to blunt, eglandular, some callus-tipped, apex usually obtuse to rounded, sometimes apiculate, surfaces glabrous. Inflorescences solitary flowers. Pedicels 0–2 mm, puberulent. Flowers ˂unisexual, plants dioecious˃, blooming at leaf emergence; hypanthium campanulate, 2–3 mm, glabrous externally; sepals spreading, triangular, 0.7–1.5 mm, margins entire, surfaces glabrous; petals white, obovate, 2–3.5 mm; ovaries hairy. Drupes reddish brown, globose to ovoid, 9–12 mm, puberulent; ˂hypanthium tardily deciduous˃; mesocarps leathery to dry (slightly splitting); stones ovoid to subglobose, not flattened.
Flowering Feb–Mar; fruiting May–Jun. Dry rocky streambeds and uplands, limestone hills, ledges; 100–700 m; Tex.
Prunus minutiflora is a rare species limited to central Texas around the Edwards Plateau.