A majority of perennial and annual species from the American continent described by Watson were referred to Lupinus.

To the Platycarpos section were attributed some annual species with two ovules in the ovary and two seeds in the pod (L. densiflorus Benth., L. microcarpus Sims.

The section Lupinnelus consisted of one species (L. uncialis), with axillary and solitary flowers, scarcely reflexed banner, and also with two ovules in the ovary.

This principle of classification was extended by Ascherson and Graebner (1907) to cover all lupins from the eastern and western hemispheres.

Lupinus L. was for the first time subdivided into two subgenera: A. Eulupinus and B. Platycarpos (Ascherson and Graebner, 1907).

Quantity of ovules (seedbuds) in the ovary and seeds in the pod was also accepted as the criterion for this division.

[1] in new combination[2] integrates the numerous perennial and annual species from the Western hemisphere, both groups having two and more ovules or seedbuds in the ovary, while subgen.

Lupinus L. includes 12 species from the Mediterranean region and Africa with at least four ovules or seedbuds in the ovary.

The seed are predominantly small-sized, with an underdeveloped embryo and small amount of endosperm.

Leaflets are smooth, with waxen coating or slight pubescence, predominantly narrow.

Geographic distribution: North, Central and South America, predominantly in the mining systems of the Andes and Cordillera.