Liquidambar styraciflua var. rotundiloba Rehder
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Variety Description - Tall tree, the smaller branches often with broad, corky wings; lvs long-petioled, rotund to reniform in outline, deeply 5-lobed, the lobes divergent, triangular, finely serrate; staminate infl 5–10 cm; mature pistillate heads brown, 3–4 cm thick including the indurate styles; 2n=32. Moist or wet woods; Conn. to s. O., s. Ill. and Okla., s. to Fla. and Guatemala. May.