Lupinus formosus, the summer lupine, is a member of the lupine genus Lupinus in the Fabaceae family. This lupine is especially attractive to pollinators due to its summer-fall blooming season. Will spread slowly by rhizome. This species dies back in winter but usually resprouts in early spring. It is native to California. Lupinus formosus has been cited as a poisonous plant. Although it is not endangered it faces eradication in some areas at the hands of cattle farmers as it has been implicated in crooked calf disease. This lupine, along with five others, is poisonous from the time it starts growth in the spring until the seed pods shatter in late summer or early fall. However, the younger the plant the more toxic it is.