Annual herbs, erect, glabrous proximal to inflorescences. Stems ribbed, (1.5–)5–10(–12) dm, glandular-verrucose dis­tally. Principal leaves 3–10 cm; leaflets 19–37, blades oblong-elliptic to oblanceolate, 2–9 mm. Peduncles (1–)2.5–14 cm. Inflorescences spikes, relatively densely flowered, not involucrate, 13–16 mm diam.; axis usually not visible, (1.5–)2–8 cm; bracts deciduous by anthesis, (3–)4–8 mm. Calyces asymmetric, recessed opposite banner, 4.8–7 mm, glabrous; tube (2.5–)2.7–3.8 mm, with 2–4(–8) large glands between ribs, lobes triangular-aristate. Corollas white, sometimes banner purplish in age; not conventionally papilionaceous; banner 4.9–7.3 mm, blade lanceolate-oblong to oblong-elliptic, 3–4.8 × 2.2–2.3 mm; epistemonous petals attached near or proximal to middle of stamen tube, blades somewhat unequal, laterals (2–)3.4–5 × 1–1.8 mm, abaxials 3–3.7 × 1.1–1.6 mm. Stamens 8–10, (7.5–)8–11 mm, filaments distinct to 0.1–1.6 mm, anthers 0.4–0.5 mm. Legumes 2.2–2.8 mm, pilosulous distally and dotted with small glands. Seeds 1.6–1.8(–2) mm. 2n = 14 (Mexico).

Phenology: Flowering fall–spring.
Habitat: Openings in woods, disturbed ground.
Elevation: 1000–1200 m.

Distribution

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Ariz., Mexico, Central America.

Discussion

The existence of Dalea exserta in the flora area rests on specimens collected in 1939 by Goodding in Sycamore Canyon, near Ruby in Santa Cruz County. Because it is an annual that often grows in disturbed ground, it may be found again there or at some other locality in southern Arizona.

Selected References

None.

Lower Taxa

None.