Publication: Bot. Gaz. 37: 262. 1904.
selected vouchers: WTU
Notes: FNA20: "Tonestus lyallii is widespread in the central Rocky Mountains and ranges of the Pacific Northwest, and is known in the Great Basin from collections in the Ruby Mountains in Elko County, Nevada. Populations documented from the Coast Range in Siskyou and Trinity counties, California, are disjunct from those in Oregon and Washington by more than 700 km."