Flora of North America species comparison

stipules absent or rudimentary on early ones, foliaceous or rudimentary on late ones;

petiole 1–5(–10) mm, pubescent or puberulent, villous, or short-silky adaxially;

largest medial blade (sometimes hypostomatous), linear or lorate, (glands marginal), 30–136–143 × 2–14 mm, 6.5–28(–37.5) times as long as wide, base cuneate, margins slightly revolute, entire or remotely spinulose-serrulate, apex acuminate or acute, abaxial surface glaucous (sometimes obscured by hairs), densely long-silky, villous or pilose to glabrescent, hairs appressed or spreading, straight or wavy, adaxial slightly glossy, sparsely or densely long-silky to glabrescent;

proximal blade margins entire;

juvenile blade yellowish green, densely long-silky-villous abaxially.

abaxial and adaxial nectaries present and distinct;

filaments hairy on proximal 1/2;

anthers (sometimes reddish turning yellow).

adaxial nectary oblong, ovate, or flask-shaped, relative adaxial nectary/stipe length variable even within same catkin;

stipe 0–0.9 mm;

ovary obclavate or pyriform, glabrous, pilose, or villous, or sometimes beak hairy, beak bulged below or abruptly tapering to styles;

ovules 12–30 per ovary;

styles (sometimes distinct), 0–0.5 mm;

stigmas flat, abaxially non-papillate with rounded tip, or 2 plump lobes, 0.1–0.5 mm.

4–8 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.

staminate 7–54 × 2–10 mm, flowering branchlet 1.5–56 mm; pistillate loosely to densely flowered, slender or stout, 14.5–70 × 3–12 mm, flowering branchlet 2–55 mm;

floral bract 1.2–2.6 mm, apex acute, convex, or rounded, entire or erose, hairs wavy, straight, or crinkled, abaxially hairy throughout or proximally, or glabrate.

= 38.