in HortScience

Average leaf area (LA) and petiole length (PL) was determined for 13 red maple selections May–Sept. 1993. Bloom types were determined based on the predominate flower structures present in Spring 1993 and 1994. Leaves were collected from an existing field study installed in Mar. 1990. Trees were drip-irrigated throughout the study, thereby eliminating moisture stress concerns. Acer×freemanii `Scarsen' (LA = 131.5 cm2), `Morgan' (LA = 93.6 cm2), and `Autumn Blaze' (LA = 83.9 cm2) had the largest leaves. Acer rubrum `Autumn Flame' (LA = 40.0 cm2) had the smallest leaves. Acer rubrum `October Glory' (PL = 17.1 cm) had the longest petioles followed by `Fairview Flame' (PL = 15.4 cm). Shortest cultivar petioles were on A. rubrum `Franksred' (PL = 9.3 cm) and `Tilford' (PL = 9.3 cm). Flowers were predominately pistillate on `Autumn Flame', `Franksred', `Morgan', `October Glory', `Redskin', `Scarsen', and `Schlesingeri'. Flowers were predominately staminate on `Fairview Flame', `Karpick', `Northwood', and `Tilford'. `Autumn Blaze' did not exhibit flowers in 1993 or 1994. Some seedlings in the study were pistillate, and others were staminate.

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