Psorothamnus schottii
Mem. New York Bot. Gard. 27: 31. 1977.
Shrubs. Branches divaricate; sterile shoots on shorter lateral branches sharp-tipped. Stems 1–2.5 dm, eglandular and usually glabrous or sparsely strigulose when young, rarely canescent. Leaves unifoliolate or pinnate, (0.7–)1–3 cm; leaflets 1 (or 3), blades linear, 6–30 mm, terminal leaflet longer than laterals, surfaces usually glabrous with glandular margins abaxially, densely silvery-pubescent adaxially. Racemes loose; rachis without thornlike tip in anthesis, 1–9 cm; bracts triangular-subulate, 0.5–1.3 mm; bracteoles present. Flowers: calyx (4–)4.6–5.7(–6.5) mm, glabrous or strigulose externally, tube (2.8–)3.3–4.3(–4.6) mm, ribs prominent, narrow abaxial intervals each with 1–5 glands in 1 row, broader adaxial intervals each with 1–17 glands in 2 rows, lobes ovate-deltate to triangular, abaxial lobe slightly shorter and narrower; corolla deep blue, banner with yellow eye; banner flabellate, (6.4–)7.1–10.5 mm, tapered to cuneate claw, apex retuse; wings broadly oblong, (6–)7–8.6 × 3–4.2 mm; keel broadly oblong, (6.1–)6.5–8(–8.8) × 3.7–4.7 mm; stamens 7–11 mm; filaments distinct to 3.5–6.5 mm; anthers 0.9–1.3 mm, connective not gland-tipped. Legumes obovoid, 7–10 mm, with large, separate glands, puberulent distally. Seeds 6–8 mm. 2n = 20.
Phenology: Flowering (fall–)late winter–early spring(–late spring).
Habitat: Rocky and sandy desert flats, slopes, washes.
Elevation: 5–800 m.
Distribution
Ariz., Calif., Mexico (Baja California).
Discussion
In California, Psorothamnus schottii is known from the Sonoran Desert regions in the very southeastern parts of the state.
Selected References
None.