Flora of North America species comparison

brown, gray, or stramineous, branched, 20–40 dm, glabrous or very sparsely strigose, especially at nodes;

bark reddish, exfoliating or flaking;

branches erect to arching;

axillary buds hidden in pouches.

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.

petiole 1–8 mm;

blade broadly lanceolate to broadly ovate, or narrowly to broadly elliptic, (3.5–)5–12(–14) × (1.4–)2–5.3(–7) cm, herbaceous, base narrowly cuneate to rounded, margins entire or irregularly to regularly serrate, crenate, or dentate, plane, abaxial surface usually glabrous or moderately strigose, rarely moderately to densely strigose-tomentose in main vein axils, sometimes sparsely strigose on main veins, rarely sparsely strigose on secondary and tertiary veins as well, adaxial surface glabrous or very sparsely strigose, especially near base and margins.

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.

cymes or racemes, or flowers solitary, 1–3(–9)-flowered, proximal 2 flowers sometimes in axils of nearly normal to much reduced (bracteal) leaves, if 1-flowered, with articulation between peduncle and pedicel revealing that it is a 1-flowered cyme by reduction.

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

3–8 mm, glabrous or slightly strigose.

3–20 mm, glabrous or sparsely strigose.

hypanthium usually glabrous, rarely moderately strigose;

sepals ovate or ovate-lanceolate, 7–14 × 5–8 mm, apex acuminate to acute, abaxial surface usually glabrous, rarely moderately strigose, adaxial surface glabrous except densely villosulous distally;

petals white, oblong, obovate, or orbiculate, 15–25(–30) × 10–22 mm;

stamens 60–90;

filaments distinct, 5–11 mm;

anthers 1–1.5 × 1 mm;

styles 4, connate proximally, cylindric, 10–16 mm, lobes 4–8 × 0.8–1 mm;

stigmatic surfaces 3–4.5 mm.

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.

obconic to obovoid, 10–13 × 7–10 mm.

obconic to obovoid, 7–11 × 4–7 mm.

caudate, 2–3 mm.

caudate, 3 mm.

= 26.

= 26.