Delphinium pavonaceum Ewan

Oregon: Polk: [locality and coordinates withheld; status in Oregon: S1 (Critically Imperiled; OBIC)],
In heavy clay soil, where dry, rather than in the moister ditch nearby. Plants with shallow, fleshy, nearly globose tubers, sepals nearly clear white, (slightly ochroleucous), widely flared, greenish-tipped and slightly cucullate (with no trace at all of yellow on inner surface but somewhat greenish-yellow and slightly bluish-tinged on back; lower petals white, the sinus deep but with margins of the lobes overlapping; upper petals moderately deep bluish-lavender. Flowers yellowed considerably in drying. Https://intermountainbiota.org/portal/collections/individual/index.php?occid=30837620. Phenology: flowering.

C.L. Hitchcock 20776, 1956-5-26
With C.V. Muhlick
WS, Catalog: 231192