Single Record

Counties: Alamosa, Conejos, Costilla, Hinsdale, Mineral, Rio Grande, Saguache, Archuleta

PhotoRecords: YES Mary E. McDonald: Conejos Co, Conejos River 2 miles upstream from Mogote cpgd; Rich Haswell: Rio Grande Co, Middle SanFrancisco Creek trailhead 2 July 2021

Comments: Three-nerved fleabane is common on both sides of the Valley, associated with mixed-conifer and aspen woods. The one Basin collection is from the San Luis Hills (1986). There are no collections from the Culebras, but it is common on both the east and west sides of the Rio Grande drainage in north New Mexico. In the USA Erigeron subtrinervis is primarily a Rockies fleabane, extending from the Canadian border to the Mexican, with scattered locations in Washington State and central Idaho. It follows the high country of the Rio Grande drainage through New Mexico down to Otero Co, but not into Texas. Note that E. subtrinervis and E. speciosus can be confused. But E. speciosus has phyllaries that are glabrous or nearly so, and E. subtrinervis has hirsute phyllaries. The three leaf veins of the second ("subtrinervis") is a difficult trait to interpret. A better trait is the hairiness of the leaf veins in E. subtrinervis.