Shrubs or trees to 6 m; bark dark gray or grayish brown, shallowly furrowed; prickles sometimes paired at nodes, recurved, scattered along twigs, petioles, and rachises. Stems slightly flexuous, usually glabrous; short shoots present. Leaves 4–80 mm; stipules narrowly triangular, to 1.1 mm, glabrous; petiole 3–30 mm, usually glabrous; petiolar gland oval to orbiculate, 0.3–1.5 mm; rachis 0–40 mm; pinnae 1–4 pairs, 10–80 mm; leaflets 3–10 pairs per pinna, blades usually obovate, rarely oblong, 5–14 × 2–7 mm, base oblique and obtuse, apex obtuse, surfaces usually glabrous. Peduncles 17–30 mm. Inflo­rescences densely flowered, globose heads, 11–15 mm diam., length less than 2 times width, usually 1–6 from short shoots. Flowers sessile or short-pedicellate; calyx 1.4–2.1 mm, usually glabrous, rarely puberulent; corolla creamy white to yellow, 2.4–3.1 mm, mostly glabrous; filaments 5–7.5 mm. Legumes 70–170 × 17–26 mm, not constricted between seeds.

Phenology: Flowering Mar–Jun.
Habitat: Dry, mostly calcareous soils, thorn scrub, oak-juniper forests, disturbed dry areas.
Elevation: 100–1500 m.

Distribution

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N.Mex., Tex., Mexico (Chihuahua, Coahuila, Nuevo León, Tamaulipas).

Discussion

Senegalia roemeriana is mostly uncommon and scattered and is rarely dominant. Typically, leaves growing from short shoots are smaller than the leaves of fast-growing branches.

Selected References

None.

Lower Taxa

None.