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).

trailing;

branches yellow-brown, gray-brown, or red-brown, glabrous or hairy;

branchlets yellow-green, yellow-brown, or red-brown, glabrous or pilose.

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 usually absent or rudimentary, rarely foliaceous;

petiole (deeply to shallowly grooved adaxially), 1.1–16 mm, (glabrous);

largest medial blade hypostomatous, narrowly to broadly elliptic, circular, subcircular, or obovate, 13–46 × 7–20 mm, 1–3.4 times as long as wide, base subcordate, cordate, rounded, or convex, margins slightly revolute or flat, entire, sometimes ciliate, apex convex, rounded, acuminate, acute, or retuse, abaxial surface glabrous, villous, long-silky, pubescent, or pilose, hairs wavy or straight, adaxial highly glossy, usually glabrous;

proximal blade margins entire;

juvenile blade (reddish or yellowish green), pilose, villous, or long-silky abaxially.

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.

abaxial nectary 0.6–1 mm, adaxial nectary oblong or ovate, 0.6–1.6 mm, nectaries distinct or connate and cup-shaped;

filaments distinct or connate less than 1/2 their lengths (glabrous);

anthers elliptic, short-cylindrical, or globose, 0.3–0.5(–0.6) 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.

abaxial nectary (0–)0.4–0.6 mm, adaxial nectary longer than stipe;

stipe 0.2–1.4 mm;

ovary obclavate or pyriform, glaucous or not, usually glabrous or tomentose, sometimes pubescent or villous, beak abruptly tapering to styles;

ovules 10–15 per ovary;

styles 0.2–0.8 mm;

stigmas flat, abaxially non-papillate with pointed tip, or slenderly cylindrical, 0.32–0.41–0.64 mm.

(3–)4–6 mm.

5.2–9.6 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.

staminate 4.8–46 × 5–11 mm, flowering branchlet 1.5–24 mm; pistillate moderately densely flowered, stout, subglobose, globose, or slender, 6.3–50 × 5–28 mm, flowering branchlet 2.5–22 mm;

floral bract brown, greenish, or bicolor, 1.2–2 mm, apex rounded, entire or, sometimes, 2-fid, abaxially hairy, hairs straight or wavy.

= 38.

= 38.