Cusick's Giant Hyssop, Cusick's Horsemint, Cusick's Horse-mint : Agastache cusickii (Synonyms: Agastache cusickii var. cusickii, Agastache cusickii var. parva) - Plants 10-20 cm high with blades from 1-2 cm long. In our range, only found on the upper cirques of the Steens Mt. in southeastern Oregon.
Western Giant Hyssop, Western Giant-hyssop, Giant Horsemint, Western Horse-mint: Agastache occidentalis - Plants 40-150 cm high with the blades of most leaves over 3 cm long. The lower surface of the blade is covered with fine, short, whitish hairs. Plants found along the east slope of the Washington Cascades.
Nettleleaf Giant Hyssop, Nettle-leaf Giant-hyssop, Nettle-leaved Giant Hyssop, Nettle-leaf Horse-mint, Nettle-leaved Horsemint: Agastache urticifolia var. urticifolia (Synonym: Agastache urticifolia) - Plants 40-150 cm high with the blades of most leaves over 3 cm long. The lower surface of the blade is glabrous to covered with short, coarse and stiff hairs. Plants found east of the Columbia River in Washington and widespread east of the Cascade Mts. in Oregon.