Flora of North America species comparison

erect;

branches yellow-green, yellow-brown, or gray-brown, glabrous;

branchlets yellow-brown or red-brown, glabrous;

branches and branchlets sometimes weakly glaucous.

(marcescent but not skeletonized), stipules usually absent or rudimentary, rarely present on late ones;

petiole (convex, or shallowly to deeply grooved, flat), 0.4–4.6(–5.5) mm, (glabrous adaxially);

largest medial blade (2 pairs of secondary veins arising at or close to base, arcing toward apex) broadly elliptic, subcircular, or circular, 1.9–16.3 × 3–10.5 mm, 0.84–1.17(–2.53) times as long as wide, base rounded or convex, margins flat, entire, ciliate, apex retuse, rounded, convex, or acute, abaxial surface glabrous, adaxial highly glossy, glabrous;

proximal blade margins entire;

juvenile blade glabrous or puberulent.

abaxial nectary 0.5–1 mm, adaxial nectary narrowly oblong or oblong, 0.8–1.4 mm, nectaries distinct;

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

anthers ellipsoid or globose, 0.4–0.6 mm.

abaxial nectary present or absent, adaxial nectary usually narrowly oblong or oblong, sometimes flask-shaped, 0.8–2 mm, longer than stipe;

stipe 0.4–0.8 mm;

ovary pyriform, glabrous or puberulent, (hairs in patches, especially on beak), beak slightly bulged below styles;

ovules 7–17 per ovary;

styles connate or slightly distinct distally, 0.5–1 mm;

stigmas flat, abaxially non-papillate with pointed tip, or slenderly or broadly cylindrical, 0.28–0.6 mm.

3.8–8.3 mm.

from subterminal buds; staminate subglobose, stout, or indeterminate, 3.3–18.5 × 2.5–12 mm, flowering branchlet 0.5–9 mm; pistillate moderately densely to loosely flowered (2–15 flowers), stout, subglobose, globose, or indeterminate, 4.5–35 × 2–17 mm, flowering branchlet 0.5–22 mm;

floral bract brown, 1.6–2.8 mm, apex rounded or retuse, entire, abaxially sparsely hairy or ciliate, hairs usually wavy, crinkled or curly, rarely straight.

is characterized by: trees, to 12 m, stems pendulous;

branches somewhat to highly brittle at base, yellowish, yellow-green, or yellow-brown;

branchlets yellowish, yellow-green, or golden;

stipules rudimentary or foliaceous on late leaves;

petiole not glandular or with pairs or clusters of spherical glands distally or scattered throughout, short-silky adaxially;

largest medial blade amphistomatous or hemiamphistomatous, narrowly elliptic to very narrowly so, margins finely serrulate or spinulose-serrulate, abaxial surface glaucous, adaxial glaucous, sparsely long-silky to glabrescent, hairs white or white and ferruginous, adaxial surface slightly glossy;

catkins on distinct flowering branchlet 3–14 mm; staminate moderately densely flowered, slender, 23–53 × 3–9 mm; pistillate moderately densely to loosely flowered, slender to stout, 18–30 × 3–8 mm, flowering branchlet 3–14 mm; pistillate bracts persistent after flowering; staminate abaxial and adaxial nectaries distinct;

stamens 2;

anthers 0.5–0.8 mm; pistillate nectary longer than stipe;

stipe 0–0.2 mm;

ovaries gradually tapering to styles;

ovules 4 per ovary;

styles 0.15–2 mm;

capsules 1–2 mm.