Dalea exigua
Mem. New York Bot. Gard. 27: 200. 1977.
Annual herbs, erect, glabrate. Stems 1–4(–4.5) dm, eglandular or weakly gland-dotted. Principal leaves 1.5–5.5 cm; leaflets 3 or 5, blades linear-oblanceolate to -elliptic, (0.5–)1–3.7(–4) cm. Peduncles (2.5–)4–16 cm. Inflorescences spikes, densely flowered, not involucrate, 5–8 mm diam.; axis not visible, (0.8–)1.3–4.5(–6) cm; bracts persistent through anthesis, 2.5–3.3 mm. Calyces asymmetric, recessed opposite banner, 3.8–4.3 mm, silky-pilose; tube 1.9–2.2 mm, with 0 glands between ribs, lobes triangular-aristate. Corollas lavender or pink-purple; not conventionally papilionaceous; banner 3.4–4.2 mm, blade ovate, 1.3–1.6 × 1–1.2 mm; epistemonous petals attached high on stamen tube, just proximal to separation of filaments, blades 1.7–2.3 × 0.9–1.1 mm. Stamens 4–7, 3–6 fertile, 3.2–4 mm, filaments distinct to 1 mm, anthers 0.2–0.3 mm. Legumes 2.5 mm, pilosulous distally, eglandular. Seeds 1.9–2.3 mm.
Phenology: Flowering fall.
Habitat: Grassy slopes, roadsides, open oak, juniper, or pine woodlands.
Elevation: 1500–2400 m.
Distribution
Ariz., N.Mex., Mexico (Chihuahua, Sonora).
Discussion
Dalea exigua occurs in southeastern Arizona (Cochise, Pima, and Santa Cruz counties) and adjacent southwestern New Mexico. A disjunct population occurs in McKinley County, New Mexico.
Selected References
None.