Flora of North America species comparison

stipules foliaceous, (prominent), apex rounded or acute;

petiole convex to flat, or shallowly grooved adaxially, 6–16 mm, velvety or pilose adaxially;

largest medial blade narrowly oblong, elliptic, or broadly elliptic, 54–100 × 18–35 mm, 1.8–3.6 times as long as wide, base convex, rounded, subcordate, or cordate, margins flat, serrate or serrulate (teeth sometimes elongate), apex acuminate to acute, abaxial surface not glaucous, glabrous, adaxial dull, glabrous or pilose, midrib hairy;

proximal blade margins entire or serrulate;

juvenile blade reddish or yellowish green, glabrous or sparsely short- or long-silky abaxially, hairs white.

adaxial nectary narrowly oblong, 0.6–1.1 mm;

filaments distinct or slightly connate, glabrous;

anthers purple turning yellow, (ellipsoid or shortly cylindrical), 0.5–0.7 mm.

adaxial nectary narrowly oblong, oblong, or flask-shaped, 0.3–1.1 mm, shorter than stipe;

stipe 1.4–3.6 mm;

ovary pyriform, glabrous, beak sometimes slightly bulged below styles;

ovules 18–22 per ovary;

styles 0.2–0.5 mm;

stigmas flat, abaxially non-papillate with rounded tip, or broadly cylindrical, 0.2–0.23–0.26 mm.

3.6–5.2 mm.

humboldtiana Willdenow: Humboldt willow is not known to occur in the flora area.

is characterized by: trees, 4–25 m;

branches highly brittle at base, bud-scale margins distinct and overlapping adaxially;

stipules on late leaves rudimentary or foliaceous;

largest medial leaf blade usually linear, abaxial surface not glaucous, adaxial dull; pistillate bract deciduous after flowering;

stamens 3–7;

capsules with distinct, often raised, white veins.;

it occurs throughout much of Mexico to central Chile.

flowering as or just before leaves emerge; staminate stout or slender, 24–43(–52 in fruit) × 6–11 mm, flowering branchlet 1–4 mm; pistillate moderately densely to loosely flowered, stout, 33–73 × 8–16 mm, flowering branchlet 2–12 mm;

floral bract brown, 0.7–1.6 mm, apex rounded, convex, or acute, abaxially hairy throughout or proximally, hairs wavy or curly.