These data were collected from 27 April 2017 through 4 Septmber 2017. Data are measurements of plant physiology collected using a LI-COR LI-6400XT Portable Photosynthesis System. Methods detailed in: Lahr, E.C., Backe, K.M. & Frank, S.D. Intraspecific variation in morphology, physiology, and ecology of wildtype relative to horticultural varieties of red maple (Acer rubrum). Trees 34, 603–614 (2020).