Psorothamnus thompsoniae
Thompson's dalea
4–9(–15) dm, gland-dotted when young, silky-pilosulous, hairs retrorse.
divaricate;
sterile shoots sharp-tipped.
pinnate, (1–)1.4–3 cm;
leaflets 7–17(or 19), blades obovate, oblanceolate, linear-oblanceolate, or linear-oblong, 2–7 mm, terminal leaflet shorter than laterals, surfaces sparsely gland-dotted abaxially, strigulose, more strongly so adaxially.
loose and open;
rachis not spine-tipped in anthesis, (1–)2–9 cm;
bracts ovate-elliptic, 0.6–1.5 mm;
bracteoles absent.
calyx 3.7–5 mm, pilosulous throughout, or tube glabrous, lobes pilosulous, tube 2.4–3.3 mm, ribs prominent, intervals each with 1–4 large glands, lobes ovate to oblong-ovate, abaxial lobe shorter;
corolla pink- to violet-purple;
banner (5.5–)6–8.4 mm, ovate to suborbiculate, base cuneate or cordate, claw linear;
wings oblong, 5.8–6.6 × 2.6–3.2 mm;
keel obovate, 5.6–6.7 × 3.4–3.8 mm;
stamens 6–7.7 mm;
filaments distinct to 2.5–3.5 mm;
anthers 0.8–0.9 mm, connective gland-tipped.
obliquely obovoid, 4–4.5 mm, with large glands distally, glabrous proximally, sparsely pilosulous distally.
2.1–2.6 mm.
Psorothamnus thompsoniae
Varieties 2 (2 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Leaflet blades obovate or broadly oblanceolate, 2–4(–5) mm; calyx tube usually glabrous, lobes pilosulous, sometimes pilosulous throughout. | var. thompsoniae |
1. Leaflet blades linear-oblanceolate or linear-oblong, 3–7 mm; calyx usually pilosulous throughout. | var. whitingii |
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