Flora of North America species comparison

branches (sometimes highly brittle at base), yellow-brown or red-brown, not to sometimes strongly glaucous, (dull to slightly glossy), glabrous or puberulent at nodes;

branchlets yellow-brown to red-brown, (weakly or strongly glaucous or not), puberulent, (buds alba-type or intermediate, scale inner membranaceous layer free, not separating from outer layer).

stipules absent or rudimentary on early ones, rudimentary or foliaceous on late ones;

petiole 1–5(–9) mm, glabrous or sparsely villous adaxially;

largest medial blade linear to lorate, 60–160 × 4–11 mm, (6.5–)11–19(–31) times as long as wide, base cuneate, margins flat, remotely spinulose-serrulate (teeth 2–5 per cm), apex acute or subacuminate, abaxial surface thinly glaucous, densely villous or long-silky to glabrescent, adaxial slightly glossy, pilose or densely villous to glabrescent;

proximal blade margins entire;

juvenile blade reddish or yellowish green, moderately densely to sparsely long-silky abaxially.

stipules absent or rudimentary on early ones, foliaceous on late ones, apex acute;

petiole convex to flat adaxially, 5–16 mm, tomentose or velvety adaxially;

largest medial blade (sometimes amphistomatous), lorate or very narrowly to narrowly elliptic, 44–110 × 6–22 mm, 3.4–9.9(–12) times as long as wide, base convex or cuneate, margins flat to slightly revolute, entire or shallowly serrulate, apex acuminate to acute, abaxial surface glaucous, sparsely short- or long-silky to glabrescent, hairs (white, also ferruginous), straight or wavy, adaxial slightly glossy, sparsely short-silky, (hairs also ferruginous);

proximal blade margins entire or shallowly serrulate;

juvenile blade reddish or yellowish green, densely long-silky abaxially, hairs white and ferruginous.

abaxial nectary 0.5–1.1 mm, adaxial nectary ovate, narrowly oblong, or flask-shaped, 0.6–1.4 mm, nectaries distinct;

filaments hairy;

anthers 0.4–0.9 mm.

adaxial nectary narrowly oblong, oblong, or ovate, 0.3–0.9 mm;

filaments distinct or connate less than 1/2 their lengths, glabrous or hairy on proximal 1/2 or basally;

anthers yellow, ellipsoid, shortly cylindrical, or globose, 0.5–0.9 mm.

adaxial nectary narrowly oblong, 0.4–1.1 mm, shorter to longer than stipe;

stipe 0.4–0.8 mm;

ovary obclavate to pyriform, glabrous, glabrescent, or long-silky, beak abruptly tapering to styles;

ovules 16–36 per ovary;

styles 0–0.2 mm;

stigmas flat, abaxially non-papillate with pointed tip, or broadly cylindrical, 0.3–0.7 mm.

adaxial nectary oblong, narrowly oblong, or ovate, 0.4–1 mm;

stipe 1.1–2.1 mm;

ovary pyriform, beak sometimes slightly bulged below styles;

ovules 12 per ovary;

styles 0.3–1 mm;

stigmas flat, abaxially non-papillate with rounded or pointed tip, 0.2–0.3–0.48 mm.

(4–)5–8(–10) mm.

5–7 mm.

(flowering throughout season); staminate 20–61 × 4–10 mm, flowering branchlet 3–20 mm; pistillate loosely flowered, slender or stout, 20–67 × 5–9 mm, flowering branchlet 3–19 mm;

floral bract (sometimes greenish), 1.5–3.5 mm, apex acute, acuminate, or rounded, entire, erose, or toothed, abaxially hairy either proximally or distally, hairs wavy.

flowering just before or, sometimes, as leaves emerge; staminate stout, (1.4–2.7–)16–28 × 9–17 mm, flowering branchlet 1–3 mm; pistillate loosely flowered, stout, (1.5–2.7–)19–44(–65 in fruit) × 10–18 mm, flowering branchlet 1–6 mm;

floral bract brown or bicolor, 1.1–2.4 mm, apex rounded or convex, abaxially hairy, hairs straight.

= 38.

= 76.