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 (highly brittle or not at base), red-brown to violet, usually glaucous, glabrous;

branchlets yellow-brown, (strongly glaucous or not), glabrous, sparsely velvety, or tomentose.

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

petiole convex to flat adaxially, 4–14 mm, velvety adaxially;

largest medial blade lorate, narrowly oblong, narrowly elliptic, or narrowly oblanceolate, 47–115 × 8–22 mm, 3.5–7.7 times as long as wide, base cuneate or convex, margins flat to slightly revolute, entire and gland-dotted, serrulate or crenate, apex acuminate, acute, or convex, abaxial surface glaucous, glabrous, sparsely tomentose, or short-silky, hairs wavy, adaxial slightly to highly glossy, glabrous or pilose;

proximal blade margins entire or serrulate;

juvenile blade yellowish green or reddish, glabrous or sparsely villous abaxially, hairs white.

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, 0.3–0.8 mm;

filaments connate less than to more than 1/2 their lengths;

anthers yellow or purple turning yellow, ellipsoid or shortly cylindrical, 0.4–0.7 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 to oblong, 0.3–0.7 mm;

stipe 0.4–1 mm;

ovary pyriform, beak slightly bulged below styles;

ovules 9–12 per ovary;

styles 0.3–0.9 mm;

stigmas flat, abaxially non-papillate with rounded tip, 0.15–0.28–0.6 mm.

3.5–5.6 mm.

3.5–4 mm.

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 or just before leaves emerge; staminate stout or subglobose, 15–34 × 8–22 mm, flowering branchlet 0(–2) mm; pistillate densely flowered, stout or slender, 14–43 × 7–12 mm, flowering branchlet 0–4 mm;

floral bract brown or black, 1.3–2.5 mm, apex rounded, abaxially hairy, hairs straight or wavy.

= 38.

= 38.