Flora of North America species comparison

1–2.5 m, ± glabrous proximally, tomentose distally.

0.5–2 m, nearly glabrous to densely tomentose.

ovate, distalmost lanceolate to lance-linear, 20–40 × 15–25 cm, reduced distally, tomentose-ciliate, curly-hairy abaxially, glabrous or veins sparsely short-hairy adaxially.

ovate to elliptic, reduced distally, to lanceolate, 15–35 × 8–20 cm, glabrous to densely hairy, especially on abaxial surface.

dense-paniculate, with spreading to stiffly erect branches to near tip or distal 1/3–1/2 unbranched, 30–70 cm, tomentose;

bracts ovate-elliptic to lanceolate, shorter than to obviously longer than flowers.

paniculate, with ascending to spreading or distinctly drooping (particularly in w North America) branches, 30–70 cm, tomentose;

bracts lanceolate, shorter than flowers.

narrowly ovoid, 2–3 cm, glabrous.

oblong-ovoid, 2–3 cm, glabrous.

flat, winged, 10–12 mm.

flat, broadly winged, 8–10 mm.

creamy white, greenish basally, lanceolate to elliptic or oblong-ovate, not or very slightly clawed, 8–17 mm, margins entire to denticulate, glabrous to abaxially tomentose;

gland 1, basal, green, V-shaped;

ovary glabrous or with few hairs;

pedicel 1–6 mm.

deep green to yellowish, lanceolate to oblong-elliptic, narrowed to short, broad claw, 5–12 mm, tomentose adaxially, margins of both whorls or at least inner obviously erose-serrulate;

gland 1, basal, dark green or yellowish green, V-shaped;

ovary glabrous;

pedicel 2–10 mm.