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.

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 foliaceous, apex acute, acuminate, or rounded;

petiole convex to flat, or shallowly grooved adaxially, 3–17 mm, pilose, villous, or pubescent adaxially;

largest medial blade (often amphistomatous), lorate, narrowly oblong, or narrowly to broadly elliptic, 26–102 × 8–30 mm, 2.5–3–5.2 times as long as wide, base convex, rounded, or subcordate, margins flat or slightly revolute, (thickened), entire or serrulate, apex acute or acuminate, abaxial surface not glaucous, glabrous, pilose, or moderately densely short-silky, hairs (white, sometimes also ferruginous), wavy, adaxial dull or slightly glossy, glabrous or moderately densely pilose;

proximal blade margins entire, crenate, or serrulate;

juvenile blade green, pilose to densely villous abaxially, 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, ovate, or flask-shaped, 0.6–1.5 mm;

filaments distinct or connate ca. 1/2 their lengths, glabrous, hairy on proximal 1/2;

anthers yellow or purple turning yellow, 0.5–0.8 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, ovate, or flask-shaped, 0.3–0.8 mm, shorter than stipe;

stipe 0.5–2.5 mm;

ovary pyriform, glabrous, beak gradually to abruptly tapering to or slightly bulged below styles;

ovules 10–18 per ovary;

styles 0.3–1.4 mm;

stigmas flat, abaxially non-papillate with rounded tip, or slenderly cylindrical, or 2 plump lobes, 0.2–0.26–0.48 mm.

5–9 mm.

2.5–6 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.

flowering as or just before leaves emerge; staminate stout or subglobose, 7–37 × 5–12 mm, flowering branchlet 0.5–5.6 mm; pistillate densely or moderately densely flowered, stout, 12–62 × 7–17 mm, flowering branchlet 1–9 mm;

floral bract brown, 0.7–2.1 mm, apex rounded or retuse, abaxially hairy throughout or proximally, hairs straight, wavy, or curly.

= 38.

= 76.