Flora of North America species comparison

spreading to arching, densely branched.

erect, densely branched.

sometimes tardily deciduous;

petiole 1–2 mm or indistinct;

blade linear to lanceolate, 2.5–4 × 0.3–1 cm, membranous, base acute, margins irregularly, sharply serrulate, venation pinnate eucamptodromous, secondary veins not prominent, apex acuminate, surfaces glabrous.

petiole 5–10 mm;

blade ovate to ovate-lanceolate, 4–8 × 1.5–4 cm, membranous, base obtuse, margins usually coarsely, irregularly, sharply serrate to serrulate in distal 2/3, sometimes 2-serrate, venation pinnate simple craspedodromous, secondary veins not prominent, apex acute, surfaces glaucous, glabrous.

mostly axillary, hemispheric panicles, (2–)3–7-flowered, sessile on leafless stems in spring, 2–6 × 2–6 cm;

branches glabrous.

mostly axillary, racemiform, corymbiform, or hemispheric panicles, (2–)3–10 × 2–5 cm;

branches glabrous.

5–8 mm, glabrous.

5–10 mm, glabrous.

6–8 mm diam.;

hypanthia crateriform, 2–4 mm, abaxial surface glabrous, adaxial glabrous or puberulent;

sepals ovate-triangular, 1.3–2 mm;

petals white, obovate to suborbiculate, 2–4 mm;

staminodes 10–14;

stamens 18–20, 0.3 times petal length.

5–12 mm diam.;

hypanthia campanulate, 1.5–2 mm, abaxial surface glabrous, adaxial glabrous to puberulent;

sepals ovate-triangular, 2.5–3 mm;

petals white, broadly ovate, 4–6 mm, apex notched or erose;

staminodes 0;

stamens 35–50, 2 times petal length.

oblanceoloid, 1.5–2 mm, glabrous.

asymmetrical fusiform, 2–3 mm, glabrous or pubescent.

= 18.

= 18.