About Lupinus arbustus Douglas
Lupinus arbustus is a lupine species that shares the common name longspur lupine. It is native to western North America, where its range extends from British Columbia through California to Utah. It can grow in multiple habitat types, including sagebrush and forests. This plant is an erect perennial herb that reaches a maximum height of 70 centimetres, equal to 28 inches. Its texture is sometimes hairy. Each palmate leaf consists of 7 to 13 leaflets, and each leaflet can grow up to 7 centimetres, or 2 and 3/4 inches, long. The inflorescence can be up to 18 centimetres, or 7 inches, long, and bears whorls of flowers. Each individual flower reaches up to 1.4 centimetres, or 7/12 of an inch, long. The calyx of sepals surrounding the base of the flower corolla has a knob-shaped spur on its back. The flower corolla can come in colors ranging from white to yellow, and in various shades of purple or pink. The fruit this plant produces is a hairy legume pod, which is 2 to 3 centimetres, or 3/4 to 1 and 1/6 inches, long. There are several recognized subspecies of Lupinus arbustus.
