Panicum lanuginosum Elliott var. sericeum
Montana: Missoula County: Lolo Hot Spring, 26 miles west of Lolo on Highway 12.
In moist ground along ditch with warm water. Culms ascending to spreading, clumps not forming dense turfs, Voucher, 2n=9II from one plant in this population, near P. lanuginosum var. fasciulatum. Phenology: Flowers.
R. Spellenberg 545, Jul 16, 1964
WTU, Accession: 236403