Pityopsis graminifolia (Michx.) Nutt. is the most common and widely distributed species of the genus occurring from Delaware and southern Ohio to Texas and south Florida (Semple 2006 FNA). One variety also occurs in Central America.
Semple and Bowers (1985) divided the species into five varieties based on leaf and pubescence traits. Bridges and Orzell (2018) and Nesom (2019) presented different treatments of the genus recognizing more species.
Varieties with smaller heads:
Varieties with larger heads:
Bridges, E.L. and S.L. Orzell. 2018. Reassessment of Pityopsis section Graminifoliae (Small) Semple in peninsular Florida. Pp. 29–32, in Weakley et al. Combinations, rank changes, and nomenclatural and taxonomic comments in the vascular flora of the southeastern United States. III. J. Bot. Res. Inst. Texas 12: 27–67.
Nesom, G.L. 2019. Taxonomic synopsis of Pityopsis (Asteraceae). Phytoneuron 2019-1: 1–31.
Last update 24 May 2023 by J.C. Semple
© 2023 J.C. Semple, including all photographs unless otherwise indicated