Plains larkspur, white larkspur, Penard's larkspur

Delphinium virescens Nuttall, Gen. N. Amer. Pl. 2: 14. 1818; D. virescens var. macroseratilis (Rydberg) Cory; D. virescens var. penardii (Huth) L. M. Perry

Roots without elongate central axis; fascicles 2-8, ± horizontal. Stems 50-80 cm. Leaves mostly cauline at anthesis; distalmost petioles more than 5 mm. Leaf blade with 5 or more major divisions; ultimate lobes of midcauline leaf blades 5-15, width 2-6 mm. Flowers: sepals white to very pale blue. 2 n = 16.

Flowering late winter-early summer. Prairies, sandy, loamy, or clay soils; 250-2000 m; Man.; Colo., Iowa, Kans., Minn., Mo., Nebr., N.Dak., Okla., S.Dak., Tex., Wis.

Delphinium carolinianum subsp. virescens is known to hybridize with D . madrense and with D . wootonii .