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).

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 (sometimes marcescent), foliaceous, (3–12–35 mm, 1.7–3.6–6.6 times as long as wide, lanceolate or narrowly elliptic, sometimes ovate or oval, base broad, abruptly tapering), apex acuminate or acute;

petiole convex to flat or shallowly grooved adaxially, 2–7.3–27 mm, villous to glabrescent adaxially;

largest medial blade broadly to narrowly elliptic, or obovate, 23–45–100 × 10–22–55 mm, 1.2–2.2–4.2 times as long as wide, base cuneate, convex, or concave, margins slightly revolute or flat, entire or serrulate, apex acute, acuminate, or convex, abaxial surface glaucous, glabrous or pilose, hairs (white, sometimes also ferruginous), curved, adaxial slightly glossy, moderately densely villous or pilose to glabrescent;

proximal blade margins usually entire, sometimes serrulate;

juvenile blade yellowish green, abaxially densely villous or pilose, sometimes glabrous, hairs white, sometimes also ferruginous.

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, 0.7–1.8 mm;

filaments distinct to connate ca. 1/2 their lengths, glabrous;

anthers purple turning yellow, ellipsoid to shortly cylindrical, 0.5–0.8 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 narrowly oblong, oblong, or flask-shaped, 0.6–1.4 mm (2+-lobed), longer than stipe;

stipe 0.4–1 mm;

ovary pyriform, beak gradually tapering to styles;

ovules 22–37 per ovary;

styles 1–2.8 mm;

stigmas slenderly cylindrical, 0.32–0.63–0.86 mm.

(3–)4–6 mm.

4.5–6.8 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 before leaves emerge; staminate stout or subglobose, 22–53 × 16–24 mm, flowering branchlet 0 mm; pistillate densely flowered, slender or stout, 25–69(–85 in fruit) × 13–20 mm, flowering branchlet 0–2 mm;

floral bract brown or black, 2.4–3.2 mm, apex acute, rounded, or retuse, abaxially moderately densely hairy, hairs straight.

= 38.

= 38.