Lupinus argenteus var. argophyllus
Proc. Amer. Acad. Arts 8: 541. 1873.
Herbs 2–8 dm, pubescent. Stems branched. Leaves cauline; petiole of proximal cauline leaves 1.5–3 cm; leaflet blade surfaces silvery-pubescent. Pedicels 2–4 mm in flower, to 8 mm in fruit. Flowers 8–12 mm, in profile appearing closed; calyx spur 1–3 mm (less pronounced); corolla light blue, banner usually hairy abaxially. 2n = 48.
Phenology: Flowering Jun–Aug.
Habitat: Pinyon-juniper woodlands, grasslands.
Elevation: 1200–2200 m.
Distribution
Ariz., Colo., Mont., Nebr., N.Mex., Okla., S.Dak., Tex., Wyo.
Discussion
Variety argophyllus is known from the foothills of the Rocky Mountains from Montana and South Dakota southward to northern Arizona, New Mexico, and the San Juan Basin in southwestern Colorado, and eastward into Nebraska, Oklahoma, Texas, and Wyoming.
Variety argophyllus can be separated by the spurred calyx, flowers in profile appearing closed or shallowly gaping, and petioles of the lowest or largest cauline leaves 1.5–3 cm.
Selected References
None.