Shrubs or trees to 5 m; bark light brown, shallowly furrowed; prickles absent or slightly recurved, scattered along twigs. Stems slightly flex­uous, usually puberulent; short shoots mostly absent. Leaves 25–65 mm; stip­ules linear, to 3.5 mm, puberulent; petiole 3–22 mm, puberulent; petiolar gland in expanded channel, mar­gins raised, orbiculate to elliptic, 0.6–1.7 mm; rachis 15–50 mm; pinnae 2–7 pairs, 15–35 mm; leaflets 15–20 pairs per pinna, blades oblong, 3–7 × 0.7–1.7 mm, base oblique and obtuse, apex acute, surfaces usually appressed-puberulent. Peduncles 8–25 mm. Inflorescences densely flowered, globose or subglobose heads, 10–15 mm diam., length less than 2 times width, 1–4 in leaf axils. Flowers sessile; calyx 1–2 mm, puberulent; corolla white, 2–3 mm, puberulent; filaments 5–7 mm. Legumes 40–160 × 20–35 mm, sometimes constricted between some seeds.

Phenology: Flowering Apr–Jun.
Habitat: Dry, mostly calcareous soils, thorn scrub, desert grasslands.
Elevation: 100–1400 m.

Distribution

• Generated Map
• Legacy Map

Loading map...

Tex., Mexico (Chihuahua, Coahuila, Durango, Sonora).

Discussion

Senegalia ×emoryana is a fertile hybrid between S. berlandieri and S. greggii and is relatively common where the parents are sympatric in southern Texas and Mexico. Backcrosses of the hybrid with either parent are occasionally encountered and appear to be fertile.

Selected References

None.

Lower Taxa

None.