Flora of North America species comparison

branches (sometimes highly brittle at base), yellow-brown or red-brown, not glaucous, glabrous or pilose;

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

branches red-brown, yellow-brown, or violet, not to strongly glaucous (slightly or highly glossy), villous to glabrescent with persistent patches of hairs;

branchlets red-brown or yellow-brown, pilose to densely villous, (buds caprea-type, scale inner membrane free, separating from outer layer).

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

petiole convex to flat, or shallowly grooved adaxially, 3–13(–16) mm, tomentose or velvety adaxially;

largest medial blade elliptic, narrowly oblanceolate, oblanceolate, or obovate, 31–70–120 × 17–48 mm, 2.1–3.1–4 times as long as wide, base cuneate or convex, margins slightly revolute or flat, strongly revolute proximally, entire, irregularly serrate, or sinuate, (glands submarginal or epilaminal), apex acuminate or convex, abaxial surface not evidently glaucous, (obscured by hairs), densely short-silky, woolly, or silky-woolly, hairs straight, wavy, or curved, adaxial slightly glossy (sometimes dull and glaucous), pilose or moderately densely short-silky;

proximal blade margins entire or shallowly serrulate;

juvenile blade green, densely long-silky or woolly abaxially, (sparsely silky-tomentose adaxially), hairs white.

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.

flowering just before or as leaves emerge;

staminate slender or stout, (17–)22–54 × 8–15 mm, flowering branchlet 1–9 mm;

pistillate moderately densely flowered, slender to stout, 25–73(–115 in fruit) × 5–15 mm, flowering branchlet 1–20 mm;

floral bract tawny to dark brown, 1.4–2.4 mm, apex rounded or acute, abaxially hairy, hairs straight or wavy.

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.

adaxial nectary narrowly oblong, oblong, ovate, or flask-shaped, 0.4–1.3 mm;

stamens 1;

filaments distinct, glabrous;

anthers purple turning yellow, shortly cylindrical, 0.5–0.7 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 square, ovate, or flask-shaped, 0.5–0.9 mm, shorter to longer than stipe;

stipe 0.4–1.4 mm;

ovary ovoid to pyriform, long- or short-silky or villous, beak sometimes slightly bulged below styles;

ovules 14–20 per ovary;

styles 0.4–0.8 mm;

stigmas flat, abaxially non-papillate with rounded tip, or broadly cylindrical, 0.16–0.28–0.4 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.

3.5–5.6 mm.

4.5–6.8 mm.

= 38.

= 38.