Flora of North America species comparison

branches divaricate, sometimes ± brittle at base, yellow-brown to dark red-brown, not or weakly glaucous, pilose to glabrescent, peeled wood often with very dense striae, to 25 mm;

branchlets yellow-green or red-brown, moderately to very densely villous to glabrescent.

branches dark red-brown or gray-brown, not glaucous, glabrous or hairy, (peeled wood smooth or striate with relatively few, short striae);

branchlets red-brown, moderately to very densely pubescent or velvety.

stipules rudimentary or absent on early ones, apex acute, acuminate, or convex;

petiole convex to flat adaxially, 2–5.5–13 mm, pubescent adaxially;

largest medial blade narrowly oblong, narrowly elliptic, elliptic, oblanceolate, or obovate, 20–44–87 × 10–16–45 mm, base cuneate, convex, or rounded, margins flat, entire, crenate, or irregularly serrate, glands submarginal, apex acute, acuminate, or convex, abaxial surface glaucous, moderately densely pubescent or long-silky to glabrescent, hairs white or gray, wavy, adaxial finely impressed-reticulate, dull or slightly glossy, moderately densely pubescent, sparsely short-silky, or glabrescent, hairs white or gray;

proximal blade margins entire, gland-dotted;

juvenile blade yellowish green or reddish, pilose or sparsely to moderately densely tomentose or long-silky abaxially, hairs white.

stipules usually foliaceous, sometimes minute rudiments on early ones, foliaceous on late ones, (ca. 4 mm), apex acute;

petiole convex to flat, or shallowly grooved adaxially, 3.5–12(–15) mm, villous to puberulent adaxially;

largest medial blade (sometimes hemiamphistomatous), broadly obovate, elliptic, broadly elliptic, or subcircular, 24–52(–100) × 12–45 mm, base concave, rounded, subcordate, cordate, or cuneate, margins sometimes slightly revolute, serrulate, or crenulate to subentire, apex abruptly acuminate or acute, abaxial surface glaucous (tip often not glaucous), sparsely to moderately densely puberulent, or silky to glabrescent, hairs appressed or spreading, straight or wavy, adaxial slightly glossy, glabrescent or sparsely to moderately densely puberulent, pubescent, or short-silky (especially midrib);

proximal blade margins serrulate, crenulate, or entire;

juvenile blade sometimes reddish, long-silky, villous, tomentose (at least on midrib), or glabrous abaxially, hairs usually white, rarely somewhat ferruginous.

adaxial nectary oblong or ovate, 0.3–0.8 mm;

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

anthers yellow or purple turning yellow, ellipsoid or shortly cylindrical, 0.5–0.8 mm.

adaxial nectary 0.5–0.7 mm;

filaments distinct;

anthers purple turning yellow, (ellipsoid or shortly cylindrical), 0.5–0.8 mm.

adaxial nectary oblong or square, 0.3–0.8 mm;

ovary obclavate, beak slightly bulged below styles (long-beaked);

ovules 6–16 per ovary;

styles 0.1–0.4 mm;

stigmas slenderly to broadly cylindrical.

adaxial nectary ovate, square, or flask-shaped, 0.4–0.6(–1) mm;

ovary pyriform, pubescent throughout or in patches or streaks, or glabrous (hairs refractive), beak gradually tapering to styles;

ovules 12–14 per ovary;

styles 0.6–1.5 mm.

5–9 mm.

6–10 mm.

staminate flowering just before leaves emerge, pistillate flowering as leaves emerge; staminate stout to globose, 10–42 × 7–16 mm, flowering branchlet 0.5–11 mm; pistillate loosely flowered, stout, slender, or subglobose, 16.5–85 × 9–32 mm, flowering branchlet 1–26 mm;

floral bract tawny, 1.2–3.2 mm, apex rounded, abaxially hairy to glabrescent, hairs straight or wavy.

flowering as leaves emerge; staminate (densely flowered), stout or subglobose, 17–35 mm, flowering branchlet 1–3 mm; pistillate densely flowered, stout, 9–11(–30)(–80 in fruit) mm, flowering branchlet 2–5.5 mm;

floral bract pale brown, 1–1.9(–2.8) mm, apex acute, convex, or rounded, abaxially sparsely hairy, hairs straight or wavy.

= 38.

= 114.