Helianthus subtuberosus (Britt.) Britt.
[= Helianthus giganteus]
Annotated by unknown.

Montana: Lewis and Clark County: Wagner basin; ca. 3 mi. downstream from Gibson Dam on N-side of Sun River accessed from Hannon Gulch. Elev. 4500 ft.
47.6182° N, 112.7011° W; T22N R9W S36 NW NW
Coordinate Source: TRS-website.
Slope/Expo: 5% South; Shrub dominated calcerous wetland; Asso.sp: Betula occidentalis, Scirpus acutus, Elaeagnus cummutata, Salix candida; Occur: Abundant within isolated communities; Habit: Herb, ca. 3 ft. tall; Co: Rays yellow Forest Service Herbarium MRC 4281 Phenology: Flowers.

H. W. Phillips 890817-2, Aug 17, 1989
MONTU, Accession: 138614