Psorothamnus schottii |
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indigo-bush, Schott's dalea, Schott's indigo-bush |
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Habit | Shrubs. |
Stems | 1–2.5 dm, eglandular and usually glabrous or sparsely strigulose when young, rarely canescent. |
Branches | divaricate; sterile shoots on shorter lateral branches sharp-tipped. |
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. |
Psorothamnus schottii |
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Phenology | Flowering (fall–)late winter–early spring(–late spring). |
Habitat | Rocky and sandy desert flats, slopes, washes. |
Elevation | 5–800 m. (0–2600 ft.) |
Distribution |
AZ; CA; Mexico (Baja California)
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Discussion | In California, Psorothamnus schottii is known from the Sonoran Desert regions in the very southeastern parts of the state. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Psorothamnus |
Sibling taxa | |
Synonyms | Dalea schottii |
Name authority | (Torrey) Barneby: Mem. New York Bot. Gard. 27: 31. (1977) |
Web links |