Meadow Larkspur, Two-spike Larkspur: Delphinium distichum (Synonyms: Delphinium burkei misapplied, Delphinium strictum var. distichiflorum) -
Pale Larkspur: Delphinium glaucum - ? Reported from Conboy Lake National Wildlife Refuge, but not recently confirmed
Menzies' Larkspur: Delphinium menziesii (Synonyms: Delphinium menziesii ssp. menziesii, Delphinium menziesii ssp. pyramidale, Delphinium menziesii var. menziesii, Delphinium menziesii var. pyramidale) -
Upland Larkspur, Two-lobe Larkspur: Delphinium nuttallianum (Synonyms: Delphinium nuttallianum var. fulvum, Delphinium nuttallianum var. levicaule, Delphinium nuttallianum var. nuttallianum, Delphinium pauciflorum, Delphinium sonnei) -
Nuttall's Larkspur, Upland Larkspur: Delphinium nuttallii (Synonym: Delphinium nuttallii ssp. nuttallii) -
Nuttall's Larkspur, Upland Larkspur: Delphinium nuttallii (Synonym: Delphinium nuttallii ssp. nuttallii) - An interesting multi-sepaled, non-spurred form.