Flora of North America species comparison

stipules (sometimes marcescent), foliaceous, (3–12–35 mm, 1.7–3.6–6.6 times as long as wide, lanceolate or narrowly elliptic, sometimes ovate or oval, base broad, abruptly tapering), apex acuminate or acute;

petiole convex to flat or shallowly grooved adaxially, 2–7.3–27 mm, villous to glabrescent adaxially;

largest medial blade broadly to narrowly elliptic, or obovate, 23–45–100 × 10–22–55 mm, 1.2–2.2–4.2 times as long as wide, base cuneate, convex, or concave, margins slightly revolute or flat, entire or serrulate, apex acute, acuminate, or convex, abaxial surface glaucous, glabrous or pilose, hairs (white, sometimes also ferruginous), curved, adaxial slightly glossy, moderately densely villous or pilose to glabrescent;

proximal blade margins usually entire, sometimes serrulate;

juvenile blade yellowish green, abaxially densely villous or pilose, sometimes glabrous, hairs white, sometimes also ferruginous.

adaxial nectary narrowly oblong to oblong, 0.7–1.8 mm;

filaments distinct to connate ca. 1/2 their lengths, glabrous;

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

adaxial nectary narrowly oblong, oblong, or flask-shaped, 0.6–1.4 mm (2+-lobed), longer than stipe;

stipe 0.4–1 mm;

ovary pyriform, beak gradually tapering to styles;

ovules 22–37 per ovary;

styles 1–2.8 mm;

stigmas slenderly cylindrical, 0.32–0.63–0.86 mm.

4.5–6.8 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 before leaves emerge;

staminate stout or subglobose, 22–53 × 16–24 mm, flowering branchlet 0 mm;

pistillate densely flowered, slender or stout, 25–69(–85 in fruit) × 13–20 mm, flowering branchlet 0–2 mm;

floral bract brown or black, 2.4–3.2 mm, apex acute, rounded, or retuse, abaxially moderately densely hairy, hairs straight.

= 38.