Common Name: Twolobe Larkspur, Upland Larkspur, Common Larkspur

3 varieties listed in H&C:
var. fulvum (lower petals brownish or yellowish purple),
var. lineapatalum (Sepals pale blue to lavender, petals white) found Wenatchee Mtn. s. Chelan to n. Kittitas (Endemic?),
var. nuttallianum (Sepals generally deep blue)

latest thinking is there are no varieties(see below) ITIS gives var. fulvum and var. nuttallianum as synonyms of D. nuttallianum:

from eFlora.org
Delphinium nuttallianum represents an extremely difficult complex, with many variations in a number of morphologic traits. The complex has been and continues to be a major source of confusion for identification of Delphinium in North America....

Known to hybridize.

Note location (e WA), and mostly basal leaves that have multi-divided lobes.

east Central Cascades
TRAIL: Teanaway Ridge; Umtanum Ridge; Ginkgo Petrified Forest State Park
HABITAT: shrub-steppe
ELEVATION: 275 - 1,325 m (900 - 4,345 ft)
BLOOM TIME: 23-JUN; 22-APR; 04-MAY