Lupinus onustus

Lupinus onustus is a species of lupine known by the common name Plumas lupine. It is native to the high mountains of northern California, from the northern Sierra [Nevada (U.S.)|Sierra Nevada] to the Klamath Mountains where its distribution extends just into Oregon. It grows in mountain forest habitat, sometimes on serpentine soils. It is a perennial herb with a short, decumbent stem and erect inflorescence reaching heights of. Each palmate leaf is made up of 5 to 9 leaflets up to 5 centimeters long. The stout inflorescence bears many unwhorled flowers each around a centimeter long. The flower is partly or entirely purple in color.