Aliso 2: 84, plate 12, fig. F, plate 13, fig. D. 1949.
Plants to 70 cm. Leaves 20–60 mm, mostly 2-pinnately (1-pinnately in smaller plants) lobed (lobes 1–5 mm wide). Peduncles 20–80 mm. Phyllaries ± 8, connate at bases, oblanceolate. Ray-florets ± 8. Disc-florets 25+; tubes cylindro-funnelform, gradually dilated, lobes with glandular-hairs. Cypselae ± 3 mm. 2n = 16.
Phenology: Flowering Mar–May.
Habitat: Bare, clayey areas in grasslands
Elevation: 100–900 m
Of conservation concern.
Within populations, some individuals of Pseudobahia peirsonii have ray corollas with ultraviolet-reflective tips, others not.