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 yellow-brown, gray-brown, orred-brown, not to weakly glaucous (dull or slightly glossy), villous to glabrescent;

branchlets yellow-brown or red-brown, moderately densely to sparsely villous, (buds caprea- or arctica-type, scale inner membranaceous layer free, separating from outer layer in var. calcicola).

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 (sometimes marcescent), foliaceous, (1–6–14 mm, 1.1–2–4.4 times as long as wide, usually ovate, oval, or narrowly elliptic, flat when pressed), apex acute, convex, or rounded;

petiole shallowly grooved, or convex to flat adaxially, 1.5–3.8–9 mm, villous or pilose adaxially;

largest medial blade (sometimes hemiamphistomatous), narrowly to broadly elliptic or subcircular, 16–31.5–61 × 10–21.8–44 mm, 0.7–1.5–2.6 times as long as wide, base rounded or convex, sometimes cordate or cuneate, margins (sometimes purplish), flat, entire or serrulate, apex acuminate, acute, or rounded, abaxial surface glaucous, sparsely villous or pilose to glabrescent, hairs straight, adaxial dull or slightly glossy, sparsely villous or pilose;

proximal blade margins entire;

juvenile blade reddish or yellowish green, moderately densely villous abaxially, hairs white.

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 oblong or narrowly oblong, 0.5–1.2 mm;

filaments distinct, glabrous;

anthers purple turning yellow, ellipsoid or shortly cylindrical, 0.5–0.7 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, 0.2–1.1 mm, longer than or equal to stipe (rarely shorter);

stipe 0.2–1.2 mm;

ovary pyriform or obclavate, beak gradually tapering to styles;

ovules 13–20 per ovary;

styles 0.9–3 mm;

stigmas broadly cylindrical, 0.2–0.56 mm.

5–9 mm.

4–8 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 before leaves emerge; staminate (no data on var. glandulosior) stout, 18–45 × 13–21 mm, flowering branchlet 0 mm; pistillate (no data on var. glandulosior except flowering branchlet length) densely flowered, stout, 32–75(–100 in fruit) × 12–25 mm, flowering branchlet 0–5 mm;

floral bract brown or black, 1.2–3.2 mm, apex rounded or acute, abaxially hairy, hairs straight.

= 38.