Shrubs to 1.5(–2) m. Leaves: stipules narrowly triangular to lanceolate, sometimes slightly curved, to 5 mm; pinnae 1 or 2 pairs; leaflets (6 or)8–12(or 14), blades oblong-obovate, 4–12(–14) × 2–6(–7) mm. Peduncles 1.8–4.5(–6) cm at anthesis. Inflorescences axillary. Flowers: calyx 1.5–2 mm; corolla 3 mm; filaments white in proximal 1/2, pink in distal 1/2. Legumes to 70 × 6 mm. Seeds ­rhomboid-ovoid, 5–8 × 3.5–5 mm.

Phenology: Flowering spring–summer.
Habitat: Dry, rocky slopes in desert scrub.
Elevation: 1100–1400 m.

Distribution

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Ariz., Mexico (Sonora).

Discussion

The area occupied by subsp. schottii in southern Arizona and northern Sonora corresponds to the northernmost distribution limit of Zapoteca formosa. Intergradation of leaf characters between subspp. schottii and rosei (Wiggins) H. M. Hernández is evident in Sonora, making difficult the determination at the subspecies level.

Selected References

None.

Lower Taxa

None.