Lupinus antoninus

Herbs, perennial, 2–5 dm, gray- to silvery-hairy. Cotyledons deciduous, petiolate. Stems decumbent-erect, branched. Leaves cauline; stipules not leaflike, green to silvery, 10–12 mm; petiole 1–2 cm; leaflets 6 or 7, blades 15–25 × 3–7 mm, adaxial surface pubescent. Peduncles 1–4 cm; bracts semideciduous, 7–8 mm. Racemes open, 4–20 cm; flowers spirally arranged. Pedicels 3–4 mm. Flowers 12–14 mm; calyx bulge or spur 0–1 mm, abaxial lobe 3-toothed, 6–8 mm, adaxial lobe 2-toothed, 6–8 mm; corolla white, banner patch turning tawny, banner glabrous abaxially, keel upcurved, glabrous, banner ovate, wings wide, covering keel tip. Legumes 2.5–3.5 cm, silky. Seeds 4 or 5, mottled brown, 7–11 mm.

Phenology: Flowering Jun–Jul.
Habitat: Open fir forests.
Elevation: ca. 2000 m.

Calif.

Discussion

Lupinus antoninus is known only from the type locality on the southwestern slope of Anthony Peak in Mendocino County. The habit and pubescence resemble those of L. adsurgens, but the larger white flowers, the large seeds, and thick stems differentiate it morphologically. According to M. Conrad (1980), it also has different alkaloids. This taxon has not been seen since 1995 and may be extirpated.

Selected References

None.

Lower Taxa