Lupinus sericeus
Lupinus sericeus is a species of flowering plant in the legume family known by the common name silky lupine or Pursh's silky lupine. It is native to western North America from British Columbia to Arizona and east to Alberta and Colorado.
This perennial herb produces erect stems from a woody caudex and deep root system. The stems reach up to tall and may branch or not. They are coated in silvery or reddish hairs. The leaves have up to 9 lance-shaped leaflets each up to in length. They are coated in silky hairs. The inflorescence is a raceme of many flowers, usually in shades of purple or blue, but sometimes white or yellowish. The back side of the banner petal is hairy. The fruit is a hairy legume pod up to long containing up to 7 seeds.
This plant grows in many types of habitat, including forests, woodlands, chaparral, shrubsteppe, sagebrush, and grasslands. It often grows on dry, rocky slopes, and does best in open sites without shade. It can be found at low and high elevations, up to or more. It can often be found in recently burned sites. Plants associated with it include Gambel oak, common snowberry, ninebark, serviceberry, mountain-mahogany, arrowleaf balsamroot, western yarrow, heartleaf arnica, bluebunch wheatgrass, Sandberg bluegrass, fescues, prairie junegrass, and sedges.
Like many other lupines, this species is very toxic to sheep, and less so to cattle and horses. It contains teratogenic chemical compounds that may cause birth defects in a calf if the plant is eaten by its mother during the early part of the gestation period. Its toxicity is caused by a concentration of quinolizidine alkaloids. It does not appear to be toxic to wild animals such as white-tailed deer, which often consume it. Bighorn sheep feed on it in Montana and Columbia ground squirrels feed on the leaves and flowers. Many other small mammals and birds also eat parts of it.
