Flora of North America species comparison

1;

bark gray;

winter buds green to brown, ovoid to ovoid-oblong, 5–10 mm, scales dark-margined, shiny, glutinous, glabrous, ciliate, or villous.

1;

bark gray;

winter buds green to red-brown, ovoid, 5–12 mm, shiny, slightly glutinous, whitish-villous.

simple;

stipules early deciduous, whitish-villous;

blade slightly shiny, green to dark green adaxially, ovate to broadly elliptic, 5.5–10.5 × 3–8 cm, margins deeply 1–4 subpalmately lobed, lobes ± triangular, (1–)1.5–2.5 cm wide, basal sinuses deepest, margins finely serrate, secondary veins in 4–6 main pairs, apex acute to acuminate, abaxial surface thinly white-hairy to glabrate, adaxial glabrous.

simple;

stipules early deciduous, densely whitish-villous;

blade shiny, green to dark green adaxially, ovate to elliptic, 6–13 × 3.5–8.5 cm, margins proximally 4–7 pinnately lobed, lobes ± oblong, 1–1.5(–1.8) cm wide, basal sinuses deepest, margins distally coarsely serrate, main pairs of secondary veins 8–10, apex acute to obtuse, abaxial surface white-tomentose, adaxial glabrous or sparsely villous, indument usually persistent.

15–60+-flowered, rounded, 3–17.5 cm diam.;

peduncles whitish-villous.

18–85-flowered, rounded, 6–17 cm diam.;

peduncles white-tomentose.

whitish-villous.

white-tomentose.

10–17 mm diam.;

hypanthium densely villous, hypanthium plus sepals 5.5–7.5 mm;

sepals 1.5–3.5 mm, margins villous and prominently glandular, glands often relatively thick;

petals white, elliptic, broadly elliptic, or broadly ovate, 4–7 mm;

stamens 20;

carpels adnate to hypanthium, apex conic, styles 2, 3.5–4 mm.

14–16 mm diam.;

hypanthium whitish-tomentose, hypanthium plus sepals 5–6 mm;

sepals 1.5–2.5 mm, margins villous and eglandular, rarely with inconspicuous glands;

petals white, elliptic to broadly ovate, 5–7 mm;

stamens 20;

carpels distinct, apex conic, styles 2, 2.5–4 mm.

sparsely whitish-villous.

thinly white-tomentose to glabrate.

brown, narrowly obovoid, 15–19 × 10–13 mm, dull, not glaucous;

lenticels abundant;

sepals inconspicuous, incurved.

bright red, ellipsoid, sometimes narrowly obovoid, 7–16 × 6–11 mm, shiny, faintly glaucous;

lenticels few;

sepals inconspicuous, erect, villous toward apex.

brown, oblong-lanceoloid, 8.1 × 3.4 mm, slightly asymmetric, slightly flattened.

red-brown, narrowly ovoid, 6–6.5 × 2.5–3.1 mm, slightly asymmetric, slightly flattened.

= 34, 68 (Europe).

= 68 (Europe).