Flora of North America species comparison

branches (sometimes ± brittle at base), yellow-green, gray-brown, red-brown, or violet, usually glaucous, glabrous or sparsely tomentose;

branchlets yellowish, yellow-brown, red-brown, or violet, (strongly glaucous or not), glabrous or sparsely to moderately densely pubescent, (buds caprea-type).

stipules usually absent or rudimentary (rarely foliaceous);

petiole convex to flat, or shallowly to deeply grooved adaxially, 2–9 mm, velvety, short-silky, or pubescent adaxially;

largest medial blade lorate, narrowly elliptic, or linear, 32–89 × 5.5–14 mm, 3.6–8.4(–11.3) times as long as wide, base cuneate or convex, margins flat or slightly revolute, entire or distantly and shallowly serrulate, apex acute to acuminate, abaxial surface glaucous, glabrous or densely short- or long-silky, hairs (white, sometimes also ferruginous), straight, adaxial slightly glossy, densely short- or long-silky, especially midrib, to glabrescent, (hairs white, sometimes also ferruginous);

proximal blade margins entire or distantly and shallowly serrulate;

juvenile blade reddish or yellowish green, densely to sparsely long- or short-silky abaxially, hairs white, sometimes also ferruginous.

stipules foliaceous, (prominent), apex rounded or acute;

petiole convex to flat, or shallowly grooved adaxially, 6–16 mm, velvety or pilose adaxially;

largest medial blade narrowly oblong, elliptic, or broadly elliptic, 54–100 × 18–35 mm, 1.8–3.6 times as long as wide, base convex, rounded, subcordate, or cordate, margins flat, serrate or serrulate (teeth sometimes elongate), apex acuminate to acute, abaxial surface not glaucous, glabrous, adaxial dull, glabrous or pilose, midrib hairy;

proximal blade margins entire or serrulate;

juvenile blade reddish or yellowish green, glabrous or sparsely short- or long-silky abaxially, hairs white.

adaxial nectary oblong, ovate, or square, 0.3–0.8(–0.9) mm;

filaments distinct, glabrous or hairy on proximal 1/2 or basally;

anthers yellow or purple turning yellow, ellipsoid or globose, 0.4–0.5(–0.6) mm.

adaxial nectary narrowly oblong, 0.6–1.1 mm;

filaments distinct or slightly connate, glabrous;

anthers purple turning yellow, (ellipsoid or shortly cylindrical), 0.5–0.7 mm.

adaxial nectary oblong, square, or ovate, 0.2–1 mm;

stipe (0.4–)1–2.8 mm;

ovary pyriform (gourd-shaped), beak gradually tapering to styles;

ovules 6–12 per ovary;

styles 0.1–0.2(–0.6) mm;

stigmas flat, abaxially non-papillate with rounded or pointed tip, 0.2–0.3–0.44 mm.

adaxial nectary narrowly oblong, oblong, or flask-shaped, 0.3–1.1 mm, shorter than stipe;

stipe 1.4–3.6 mm;

ovary pyriform, glabrous, beak sometimes slightly bulged below styles;

ovules 18–22 per ovary;

styles 0.2–0.5 mm;

stigmas flat, abaxially non-papillate with rounded tip, or broadly cylindrical, 0.2–0.23–0.26 mm.

(3–)4–6 mm.

3.6–5.2 mm.

flowering (before or) as leaves emerge; staminate globose, (1–1.1–)11–18 × 6–11 mm, flowering branchlet 1–5 mm; pistillate densely to loosely flowered, subglobose to globose, 8–21 × 7–17 mm, flowering branchlet 0.5–8 mm;

floral bract tawny or brown (black), 1.2–2.8 mm, apex rounded or acute, abaxially hairy, hairs short, wavy or straight.

flowering as or just before leaves emerge; staminate stout or slender, 24–43(–52 in fruit) × 6–11 mm, flowering branchlet 1–4 mm; pistillate moderately densely to loosely flowered, stout, 33–73 × 8–16 mm, flowering branchlet 2–12 mm;

floral bract brown, 0.7–1.6 mm, apex rounded, convex, or acute, abaxially hairy throughout or proximally, hairs wavy or curly.

= 38.