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).

branches (highly brittle at base), yellow-brown or red-brown, weakly glaucous or not, (dull or slightly glossy), velvety or short-silky to glabrescent;

branchlets gray-brown or red-brown, sparsely or moderately densely short-silky or velvety, (buds caprea-type or intermediate).

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 usually rudimentary, sometimes foliaceous on early ones, foliaceous on late ones, apex acute;

petiole shallowly grooved, or convex to flat adaxially, 3–12 mm, short-silky or velvety adaxially;

largest medial blade lorate, narrowly oblanceolate, or oblanceolate, 43–74–103 × 8–25 mm, 2.9–4.8–7.7 times as long as wide, base convex or cuneate, margins slightly revolute to flat, entire, apex acuminate, convex, or acute, abaxial surface glaucous (sometimes obscured by hairs), densely short-silky, hairs straight, adaxial dull (sometimes thinly glaucous) to slightly glossy, sparsely short- or long-silky;

proximal blade margins entire;

juvenile blade yellowish green or reddish, densely 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 to oblong, 0.4–0.8 mm;

stamens 1 or 2;

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

anthers purple turning yellow, ellipsoid or shortly cylindrical, 0.6–0.8 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 oblong to narrowly oblong or flask-shaped, 0.3–0.6 mm, shorter than or equal to stipe;

stipe 0.4–1.2 mm;

ovary pyriform, densely long-silky, beak gradually tapering to styles;

ovules 13–18 per ovary;

styles 0.4–0.6 mm;

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

(3–)4–6 mm.

3–5 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 leaves emerge; staminate stout or subglobose, 16–16.5 × 11–13 mm, flowering branchlet 2.5–3 mm; pistillate moderately densely flowered, slender to stout, 33–55 × 10–11 mm, flowering branchlet 1.5–7 mm;

floral bract brown or tawny, 0.8–2 mm, apex rounded or acute, abaxially hairy, hairs straight.

= 38.