Porter's Aster, Smooth White Aster
Symphyotrichum porteri (A. Gray) G.L. Nesom is the foot hills and near the Rocky Mountain Front Range in southeastern Wyoming, Colorado and northeastern New Mexico (Brouillet et al. 2006; FNA). The species has glabrous leaves without axillary clusters, scabrous margins, and inforescence branches ascending, peduncle bracts 1–3; ray laminae white, 6.8–12 × 0.7–1.8 mm; disc florets (30–)40–75(–103). The species is diploid 2n=16.
Brouillet, L., J.C. Semple, G.A. Allen, K. Chambers and S. Sundburg. 2006. Symphyotrichum Nees. pp. 465-539. In Flora North America Editorial Committee, eds. Flora of North America. Vol. 20. Asteraceae, Part 2. Astereae and Senecioneae. Oxford University Press, New York.
Revised 17 May 2021 by J.C. Semple
© 2021 J.C. Semple, including all photographs unless otherwise indicated