Leaf shape and base variation in Fothergilla: Ai–Aii Fothergilla major (V-cordate/V-rounded, i.e. with distinct cuneate portion at extreme blade base that broadens out laterally to cordate [Ai.] or rounded [Aii.]) Bi–Bii Fothergilla parvifolia (note the neatly cordate bases without well-defined cuneate portions at extreme blade base) Ci–Cii Fothergilla milleri (bases rounded). Fothergilla gardenii not shown as bases are variably rounded, cuneate, or cordate. IL = the length of the midvein interval between the junction of the midvein and lowermost secondary vein and the junction of the midvein and the next-most distal secondary vein on the same side of the leaf; IW = the width, at the widest point, of the intervening leaf surface between the lowermost secondary vein and the leaf margin. Illustrations by A. Krings based on Lynch 29 (Ai.), Lynch 21 (Aii.), Phillips 56 (Bi.), Lynch 18 (Bii.), Lynch 68 (Ci.), and Lynch 69 (Cii.).