Senecio triangularis Hook. var. triangularis
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.
Wet marshy depressions, lake margins, and streambanks, often in dense stands. Associated with Alopecurus alpinus, Angelica arguta, and Carex spp.; or with Mertensia ciliata, Mimulus guttatus, and Aconitum columbianum. The variety is triangularis. 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 468, 6/29/1977-7/4/1977
IDS, Accession: 2012.012, Barcode: IDS0018530