Flora of North America species comparison

branches divaricate, sometimes ± brittle at base, yellow-brown to dark red-brown, not or weakly glaucous, pilose to glabrescent, peeled wood often with very dense striae, to 25 mm;

branchlets yellow-green or red-brown, moderately to very densely villous to glabrescent.

branches (sometimes highly brittle at base), red-brown or yellow-brown, not or weakly glaucous, (slightly or highly glossy), glabrous or villous;

branchlets red-brown or yellow-brown, glabrous or sparsely to very densely villous, (buds caprea-type, inner membranaceous bud-scale layer free and separating or not).

stipules rudimentary or absent on early ones, apex acute, acuminate, or convex;

petiole convex to flat adaxially, 2–5.5–13 mm, pubescent adaxially;

largest medial blade narrowly oblong, narrowly elliptic, elliptic, oblanceolate, or obovate, 20–44–87 × 10–16–45 mm, base cuneate, convex, or rounded, margins flat, entire, crenate, or irregularly serrate, glands submarginal, apex acute, acuminate, or convex, abaxial surface glaucous, moderately densely pubescent or long-silky to glabrescent, hairs white or gray, wavy, adaxial finely impressed-reticulate, dull or slightly glossy, moderately densely pubescent, sparsely short-silky, or glabrescent, hairs white or gray;

proximal blade margins entire, gland-dotted;

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

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

petiole shallowly grooved, or convex to flat adaxially, 3.5–7.3–13 mm, (sometimes with 2 spherical glands distally), villous, tomentose, pilose, or pubescent adaxially;

largest medial blade narrowly oblong, narrowly elliptic, elliptic, or oblanceolate, 35–61.3–110 × 11–16–46 mm, 2–2.7–5.2 times as long as wide, base convex, rounded, subcordate, or cuneate, margins flat or slightly revolute, (thickened and raised), crenulate or serrulate, apex acuminate, acute, or convex, abaxial surface usually very thickly glaucous, glabrous or pilose, midribs pubescent to tomentose, hairs (white, often also ferruginous), curved, wavy, or straight, adaxial slightly glossy, glabrous or pilose, midribs sparsely pubescent (hairs white, sometimes also ferruginous);

proximal blade margins entire or serrulate;

juvenile blade translucent, reddish or yellowish green, glabrous or sparsely pubescent abaxially, midribs often densely hairy, hairs white, sometimes also ferruginous.

adaxial nectary oblong or ovate, 0.3–0.8 mm;

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

anthers yellow or purple turning yellow, ellipsoid or shortly cylindrical, 0.5–0.8 mm.

adaxial nectary narrowly oblong, oblong, square, or ovate, 0.44–0.48–1.4 mm;

filaments distinct, glabrous;

anthers yellow, (ellipsoid or globose), 0.52–0.69–0.76 mm.

adaxial nectary oblong or square, 0.3–0.8 mm;

ovary obclavate, beak slightly bulged below styles (long-beaked);

ovules 6–16 per ovary;

styles 0.1–0.4 mm;

stigmas slenderly to broadly cylindrical.

adaxial nectary oblong, narrowly oblong, square, or flask-shaped, 0.56–0.8–1.4 mm, shorter than stipe;

stipe 0.96–1.7–3.4 mm;

ovary pyriform, glabrous, beak slightly bulged below styles;

ovules 12–14 per ovary;

styles (sometimes distinct), 0.3–0.8–1.3 mm;

stigmas flat, abaxially non-papillate with rounded or pointed tip, or slenderly cylindrical, 0.24–0.43–0.56 mm.

5–9 mm.

5–7–11 mm.

staminate flowering just before leaves emerge, pistillate flowering as leaves emerge; staminate stout to globose, 10–42 × 7–16 mm, flowering branchlet 0.5–11 mm; pistillate loosely flowered, stout, slender, or subglobose, 16.5–85 × 9–32 mm, flowering branchlet 1–26 mm;

floral bract tawny, 1.2–3.2 mm, apex rounded, abaxially hairy to glabrescent, hairs straight or wavy.

staminate flowering before leaves emerge, pistillate as leaves emerge; staminate stout or slender, 23.5–35.6–51 × 9–12.7–22 mm, flowering branchlet 1–3.9–10 mm; pistillate loosely flowered, stout or slender, 19–42–62(–85 in fruit) × 8–13–18 mm, flowering branchlet 1.5–5.9–13 mm;

floral bract brown or bicolor, 1.2–1.8–3 mm, apex rounded or acute, sometimes toothed, abaxially hairy, hairs straight or wavy.

= 38.