The type was collected near Kamiah in Idaho Co., Idaho, on 5 Jun 1806. Pursh lists this as "On the river Kooskoosky . . . June." Lewis refers to a "horsemint" in his journal of this date (Moulton, 1991: 335), but this probably refers to a different species. That common name typically applies to the genus Monarda, which Lewis would know from Virginia. Inasmuch as M. fistulosa L. var. menthaefolia (Grah.) Fernald (in Rhodora 46: 495. 1944) occurs in the area, and differs only slightly from the eastern variety, it is not likely Lewis would make a specimen of it or confuse it with skullcap, Scutellaria angustifolia. (The Lewis & Clark Herbarium Digital Imagery Study Set, ANSP, 2002) On deposit at the Academy of Natural Sciences, Philadelphia Collected by:Meriwether Lewis & William Clark Collection date:06/05/1806