Symphyotrichum welshii

Welsh's Aster

Symphytrichum welshii (Cronquist) Nesom is native to bogs, seeps and river banks in scattered locations in southern Utah, northwestern Wyoming, and a few locations in Idaho and Montana. It can be locally common. It is similar to Symphyotrichum boreale and Symphyotrichum lanceolatum. It is distinguished by having well developed rosettes on the ends of short lateral rhizomes developing later in the season; such rosettes are often present when shoots begin to flower. The phyllaries are usually spreading to squarrose when heads are fresh. Owen, Semple & Baum (2006) included the species in a multirvariate study of Sy. boreale, Sy. nahanniense, and S. welshii.  The species is diploid 2n=16.