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.

1–3(or 4);

bark gray to bronze;

winter buds purple, ovoid to ovoid-conic, 5–15 mm, dull, not glutinous, usually densely villous, hairs whitish, rarely rufous, outer scales sometimes merely ciliate.

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.

pinnately compound;

stipules deciduous or persistent, whitish-villous or glabrate;

blade paler or often whitish abaxially, dull green to bluish green adaxially, leaflets 11–17(–19), opposite, oblong to oblong-lanceolate or oblanceolate, (2.5–)3–6(–7.5) × 1.5–2 cm, l/w ratio 2.4–3.7, margins serrate at least in distal 1/2, often almost to base, apex acute to obtuse, abaxial surface white-tomentose to villous at flowering, indument often persisting, at least along midveins, leaflet axils, and petiole bases, hairs usually whitish, sometimes rufous.

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

peduncles whitish-villous.

75–200+-flowered, flat-topped or rounded, 6–18 cm diam.;

peduncles ± whitish-villous.

whitish-villous.

densely whitish-villous.

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.

8–11 mm diam.;

hypanthium densely villous, hairs whitish, hypanthium plus sepals 2.9–3.2 mm;

sepals 0.5–1 mm, margins often glandular;

petals white, orbiculate, (3–)4–5 mm;

stamens 15–20;

carpels 1/2 adnate to hypanthium, apex conic, styles 3 or 4, 1.5–3 mm.

sparsely whitish-villous.

glabrous or densely villous.

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

lenticels abundant;

sepals inconspicuous, incurved.

yellow or orange-red to red, globose to subglobose, 8–12 mm diam., shiny or dull, slightly glaucous or not;

sepals inconspicuous, incurved.

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

brown, ovoid to ovoid-lanceoloid, 3–4.5 × 1.5–2 mm, asymmetric, slightly flattened.

= 34, 68 (Europe).

= 34.