Shrubs or trees to 12 m; bark dark gray or dark brown, shallowly furrowed; prickles recurved, scattered along twigs. Stems not flexuous, usually glabrous; short shoots present. Leaves 2–35 mm; stip­ules narrowly triangular, to 1.1 mm, puberulent; petiole 2–20 mm, usually glabrous; petiolar gland oval to oblong, 0.3–1.1 mm; rachis 0–24 mm; pinnae 1–3 pairs, 3–22 mm; leaflets 3–7(–9) pairs per pinna, blades oblong or obovate to oblanceolate, 5.5–9.2 × 2.2–4.5 mm, base oblique and obtuse, apex obtuse, surfaces usu­ally pubescent. Peduncles 10–40 mm. Inflorescences loosely to densely flowered, cylindric spikes, 20–70 mm, length 3+ times width, 1–4 from short shoots. Flowers pedicellate, pedicel 0.5–2.1 mm; calyx 1.2–2 mm, glabrous or puberulent; corolla creamy white to yellow, 1.8–2.8 mm, glabrous; filaments 5–7 mm. Legumes 40–150 × 15–25 mm, constricted between some seeds.

Phenology: Flowering Apr–Jun.
Habitat: Dry, mostly calcareous soils, thorn scrub, desert grasslands, disturbed sites.
Elevation: (20–)100–1100 m.

Distribution

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Ariz., Tex., Mexico (Baja California Sur, Chihuahua, Coahuila, Nuevo León, Tamaulipas).

Discussion

Senegalia wrightii is closely related to S. greggii, under which S. wrightii is sometimes treated as a synonym or variety. Senegalia wrightii is distinguished from S. greggii in being usually more robust, with larger leaves, petioles, and petiolar glands, and leaflet blades are obovate to oblanceolate; S. greggii is smaller and leaflet blades are mostly oblong to only slightly obovate. Both hybridize with S. berlandieri, and probably with each other. Typically, leaves growing from short shoots of S. wrightii are smaller than the leaves of fast-growing branches. Senegalia wrightii hybridizes with S. berlandieri (= S. × turneri).

Selected References

None.

Lower Taxa

None.