Lupinus sericeus Pursh
Collected near Kamiah in Idaho Co., Idaho, on 5 Jun 1806. (Source)
Silky lupine is a native, perennial, cool-season forb. Simple or branched
stems arise from a woody caudex. Plants are generally 8 to 20 inches (20-50 cm)
tall. Leaves are mostly basal and have seven to nine leaflets. The inflorescence
is a terminal raceme. There are soft blue and white blossoms on 8 inch flower
stalks. Flowers are conspicuously hairy on the dorsal side of the banner. Pods
contain three to seven seeds. Silky lupine has a deeply buried root system.
Silky lupine is a cool-season species, growth begins in May and flowering occurs
from June through July.
Silky lupine is found in a range of habitats including grasslands, sagebrush, mountain brush, and aspen and conifer forests.I t grows best in dry, sandy, loamy, sandy-loam, and clayey-loam soils. It does not grow well in clay or other organic, acid, or sodic-saline soils. Silky lupine has been found to 10,000 feet (3,030 m) elevation. Silky lupine is also present in late seral Douglas-fir/pine grass habitats in Idaho. The following publications list silky lupine as an herbaceous layer dominant in Idaho fescue (Festuca idahoensis) or common snowberry (Symphoricarpos albus) habitats.
Caution: These plants contain poisonous alkaloids,. Lupine poisoning may casue dizzines and inco-ordiation, slow breathing and heart rate.