Antennaria umbrinella Rydb.
Annotated by Gordon S. Whitehead, 29 Jun 1977. Sources: FPNW.

Idaho: Fremont County: Site 17. Targhee National Forest. Along Henry’s Lake Outlet upstream from the bridge on the road from Island Park Lodge to Big Springs. Some of the collections may have been made in sections 17,18, 19, and 21, but they were all made in or in the margins of, Henry’s Lake Flats; Elevation 1950m. Elev. 1950 m.
44.52329° N, 111.2870235° W; T14N R44E S20 SW 1/4
Datum: WGS 84. Uncertainty: 500 meters. Coordinate Source: BioGeomancer.
Open woods and rocky sagebrush meadows at lower elevations to rocky exposed summit of Mt. Two Top. Associated with Antennaria microphylla, Poaceae spp., and Potentilla gracilis; or with Erigeron compositus, Penstemon procerus, and Phacelia sericea. There is a clear intergradation between A. microphylla and A. umbrinella. The plants in collection number 1431 were taken from an area of about 3 meters radius, yet the bracts vary in color from dark green-umber to rosy pink. The usefulness of distinguishing species within such a population is doubtful. A. microphylla is also related to A. parviflora, which is the only other species in the area that can have rosy bracts. But the specimens I collected appear well marked and show no confusing intermediate characters. Voucher: Whitehead, G.S. 1983. M.S., Idaho State U. Flora of the Island Park Geothermal Study Area. Duplicates to: IDS, RM. Phenology: Flowers.

Gordon S. Whitehead 455, 6/29/1977-7/4/1977
IDS, Accession: 2012.012, Barcode: IDS0017872