Porter's Aster, Smooth White Aster
Symphyotrichum porteri (A. Gray) G.L. Nesom is native to 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 ascending inflorescence branches, 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).
Last revised 15 April 2025 by J.C. Semple
© 2025 J.C. Semple, including all photographs unless otherwise indicated
1-2. Symphyotrichum porteri. 1. Large plant with multiple stems, Semple 11234, Larimer Co. Colorado. 2. Small plant with one shoot, Semple 5803, Gilpin Co., Colorado.
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.