Flora of North America species comparison

branches red-brown, strongly glaucous (losing glaucescence in age but remaining so at nodes), glabrescent;

branchlets yellow-brown, (not glaucous, except in age), usually glabrescent, sometimes sparsely or moderately densely tomentose.

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

petiole (margins covering groove, not glandular or with spherical glands distally), 7–21 mm, glabrous or puberulent adaxially;

largest medial blade (sometimes amphistomatous), very narrowly elliptic, elliptic, lanceolate, or lorate, 55–130 × 24–37 mm, 2.8–6 times as long as wide, base convex, cuneate, or cordate, margins serrulate, apex acuminate to caudate, abaxial surface glaucous, glabrous, adaxial dull, glabrous or sparsely pubescent along midrib;

proximal blade margins entire or shallowly serrulate;

juvenile blade glabrous or pubescent abaxially, hairs white and/or ferruginous.

stipules (often adnate to petioles), usually rudimentary on early ones, late ones lanceolate to ovate, apex acuminate or acute, often adnate to petiole;

petiole shallowly grooved, or convex to flat adaxially, 5–18 mm, tomentose to glabrescent adaxially;

largest medial blade oblong, lorate, narrowly elliptic, or elliptic, 50–96(–120) × 1–35(–40) mm, base cuneate to concave, margins slightly revolute, serrate to crenate, apex acuminate, abaxial surface glaucous, glabrescent or midrib sparsely tomentose, hairs (white, sometimes also ferruginous), spreading, straight, long or short, adaxial slightly glossy, (midrib sparsely tomentose or throughout);

proximal blade margins entire, closely gland-dotted;

juvenile leaves green, sparsely to moderately densely long-silky abaxially, hairs white, sometimes some ferruginous.

abaxial nectary 0.2–0.7 mm, adaxial nectary narrowly oblong to square, 0.3–0.8 mm, nectaries distinct;

stamens 3–7;

filaments hairy on proximal 1/2 or basally;

anthers 0.5–0.6 mm.

adaxial nectary narrowly oblong to flask-shaped, 0.5–1 mm;

filaments distinct or connate basally;

anthers purple turning yellow, short- to long-cylindrical or ellipsoid, 0.5–0.7 mm.

adaxial nectary square, 0.1–0.6 mm;

stipe 1.4–3.2 mm;

ovary pyriform, beak slightly bulged below styles;

ovules 16–18 per ovary;

styles 0.2–0.4 mm;

stigmas 0.24–0.31–0.4 mm.

adaxial nectary oblong to square, 0.4–0.9 mm;

ovary pyriform, beak gradually tapering to styles;

ovules 4–6 per ovary;

styles 0.6–1.5 mm.

3–7 mm.

3.2–4.4 mm.

staminate 23–80 × 5–12 mm, flowering branchlet 3–28 mm; pistillate 41–110(–127 in fruit) × 8–16 mm, flowering branchlet 17–35 mm;

floral bract 1.5–2.8 mm, apex acute to rounded, entire or toothed, abaxially sparsely to moderately densely hairy proximally, hairs wavy; pistillate bract deciduous after flowering.

flowering before or just before leaves emerge; staminate stout, 30–47 × 9–20 mm, flowering branchlet 0–1.2 mm; pistillate densely flowered, stout, 20–50 mm, flowering branchlet ca. 1.5 mm;

floral bract dark brown or bicolor, 2.8–3 mm, apex acute to convex, moderately densely hairy throughout, hairs straight.

= 38.

= 38.