Habitat: subalpine, natural hybrid zone, subalpine meadows, mountainous terrain with elevational gradient, wet subalpine meadows, high-elevation site with extensive hybrid swarms, hybrid zone, high mountain valley, hybrid zone contact site, predominantly montane meadow vegetation, natural hybrid zone between montane plants, hybrid zone with steep talus slopes and low vegetative cover, subalpine to alpine transition, subalpine ecosystem, valley bottom, montane stream, elevational gradient with talus slopes, mountainous valley, high mountain valley draining into Slate River Valley, valley floor where I. aggregata ssp. aggregata grows