Species: Lupinus arbustus var. arbustus

Plantae - Anthophyta - Dicotyledoneae - Fabales - Fabaceae - Lupinus - Isely (1998) treats the taxon (under this varietal name) in a quite broad sense, ranging in the Pacific Northwest (including Canada) and to California, Nevada, Wyoming and Montana; in Hitchcock et al. (1961) and Hitchcock and Cronquist (1974), the equivalent taxon (under the name Lupinus laxiflorus var. laxiflorus, misapplied) is treated in a fairly broad sense. Barneby (1989) discussed variation in Lupinus arbustus in some detail (with his main focus on the Intermountain region), tending not to recognize infrataxa, and accepting none for the Intermountain region. In Hickman (1993), T. Sholars recognized no infrataxa for California.