Flora of North America species comparison

erect to ascending, green, older stems brown, branched, glabrous or sparsely strigose (especially at nodes);

bark deciduous, exfoliating or flaking, reddish;

branches erect to arching;

axillary buds hidden in pouches, sometimes apex exposed, especially on vigorous sprout-shoots.

erect to ascending, green, older stems gray, glabrous or sparsely strigose or villous, especially at nodes;

bark tight, not exfoliating or flaking, gray;

branches erect;

axillary buds hidden in pouches.

petiole 1–6 mm;

blade usually broadly lanceolate to broadly ovate, or narrowly to broadly elliptic, rarely narrowly lanceolate in horticultural forms, 3–10 × 2–6 cm, larger blades usually greater than 6 × 2.5 cm, base narrowly cuneate to rounded, margins entire to irregularly or regularly serrate, crenate, or dentate, plane, abaxial surface glabrous or sparsely strigose, hairs usually appressed-ascending, not twisted, main vein axils often moderately to densely strigose-tomentose, main veins sometimes sparsely strigose, secondary and tertiary veins rarely sparsely strigose, adaxial surface glabrous or sparsely strigose, especially near base and margins.

petiole 1–12(–20) mm;

blade broadly lanceolate to broadly ovate, or narrowly to broadly elliptic, (3–)5–10(–16) × 1.6–7(–11) cm, base narrowly cuneate to rounded, margins entire or irregularly to regularly serrate, crenate, or dentate, plane, abaxial surface moderately to densely strigose or tomentose to villous, hairs twisted, main vein axils and main veins often more densely strigose-tomentose, adaxial surface glabrous or very sparsely strigose, especially near base and margins.

cymose racemes, 5–7(–9)-flowered, proximal 2 flowers often in axils of nearly normal to much reduced (bracteal) leaves.

usually cymose racemes or cymose panicles, sometimes flowers solitary, (1–)5–9-flowered, proximal 2 or 4 flowers often in axils of nearly normal to much reduced (bracteal) leaves.

3–20 mm, glabrous or sparsely strigose.

3–8 mm, glabrous or moderately strigose.

hypanthium glabrous or sparsely strigose to villous;

sepals ovate, ovate-lanceolate, or triangular, 4–8 × 2.5–5 mm, apex acute to acuminate, abaxial surface glabrous or sparsely strigose, adaxial surface glabrous except densely villosulous distally;

petals white to cream, oblong, obovate, or orbiculate, 5–25 × 5–22 mm;

stamens 20–50;

filaments distinct, 4–9 mm;

anthers 1–1.5 × 0.7–1 mm;

styles 4, connate proximally, cylindric, 7–10 mm, lobes 3–8 × 0.3–0.9 mm;

stigmatic surfaces 1–4 mm.

hypanthium sparsely to densely strigose or villous;

sepals ovate, ovate-lanceolate, or triangular, 5–8 × 3–5 mm, apex acute to acuminate, abaxial surface moderately to densely strigose or villous, adaxial surface densely villous distally;

petals white, oblong, obovate, or orbiculate, 12–21 × 8–12 mm;

stamens 25–50;

filaments distinct, 5–11 mm;

anthers 1.5 × 1 mm;

styles 4, connate proximally, cylindric, 6–10 mm, lobes 1.5–5 × 0.4–0.7 mm;

stigmatic surfaces 1.5–4 mm.

obconic to obovoid, 7–11 × 4–7 mm.

obconic to obovoid, 6–11 × 4–7 mm.

caudate, 3 mm.

caudate, 3–4 mm.

= 26.

= 26.