Flora of North America species comparison

ascending;

twigs glabrous to sparsely pubescent, sometimes with glandular hairs.

ascending;

twigs glabrous to sparsely pubescent, without glandular hairs.

blade nearly orbiculate to narrowly ovate or ovate-oblong, often nearly angular and slightly lobulate near apex, 4–10 × 3.5–12 cm, thin to leathery, base narrowly cordate to narrowly rounded, margins coarsely and often irregularly doubly serrate, apex obtuse to acute or acuminate;

surfaces abaxially glabrous to moderately pubescent, usually pubescent on major veins and in vein axils.

blade ovate to obovate or narrowly elliptic, often nearly angular and lobulate near apex, 5–12 × 3.5–9 cm, base narrowly cordate to narrowly rounded, margins coarsely and often irregularly doubly serrate, apex usually distinctly acuminate;

surfaces abaxially glabrous to moderately pubescent, usually pubescent on major veins and in vein axils.

staminate catkins lateral along branchlets on short shoots, usually in clusters of 2–3, 4–6 × 0.5–0.8 cm;

peduncles 0.5–10 mm.

staminate catkins usually in clusters of 2–3, 4.5–6 × 0.5–0.8 cm;

peduncles mostly 0.5–2 mm.

buds containing inflorescences ovoid, 3–5 × 3–4 mm, acute.

buds containing inflorescences ovoid, 3–5 × 3–4 mm, apex acute.

in clusters of 2–6, completely concealed;

bracts bristly, connate at summit, lengthened into extended tubular beak.

in clusters of 2–6;

involucral tubular beak long, narrow, 2–3(–4) times length of nuts, densely bristly.

= 22, 28.