Flora of North America species comparison

sparsely hirsute to pilose, trichomes white.

glabrous or sparsely to densely tomentose, trichomes usually white, sometimes brown or orangish brown.

opposite;

petiole 0.8–8.6 cm, sparsely to densely hirsute abaxially, densely hirsute adaxially;

blade ovate, elliptic-ovate, or broadly ovate, (2.5–)4.2–14.9 × (1.7–)2.1–12 cm, unlobed, base cordate, truncate, or cuneate, margins dentate to serrate, apex acute to acuminate, abaxial surface grayish, uniformly velutinous, pilose, or tomentose, trichomes at 40x conspicuously tuberculate, 0.3–1 mm, adaxial surface green, sparsely hirsute.

opposite;

petiole (0.7–)1.1–8 cm, glabrous or glabrous abaxially and sparsely to densely tomentose adaxially;

blade narrowly to broadly ovate or elliptic, 4–15.2 × 1.3–11.2 cm, unlobed, base truncate to cuneate, margins dentate to serrate, apex acute to acuminate, abaxial surface white or grayish, densely tomentose, trichomes at 40x either smooth, 1–3 mm, or sparsely tuberculate, 0.3–1 mm, adaxial surface green, glabrous or sparsely hirsute along major veins.

compact, 150–500-flowered, dome-shaped to hemispheric, 3.5–14.5 × 3–16.5 cm;

peduncle 0.5–6 cm, sparsely to densely tomentose.

compact, (100–)200–500-flowered, dome-shaped to hemispheric, 4–13 × 5–14 cm;

peduncle 1.6–8.3 cm, sparsely to densely tomentose.

0.8–2.8 mm, glabrous or sparsely to densely hirsute.

0.8–3.2 mm, glabrous or sparsely hirsute.

hypanthium usually adnate to ovary to near its apex, rarely ca. 2/3 up ovary, 0.7–1 × 0.8–1.2 mm, strongly 8–10-ribbed in fruit, glabrous;

sepals deltate to triangular, 0.3–0.5 × 0.3–0.6 mm, margins entire, apex acute to acuminate, abaxial surface glabrous;

petals caducous, white to yellowish white, elliptic to narrowly ovate, 1.2–1.5 × 0.7–1.1 mm;

filaments 1.8–4.5 × 0.1–0.2 mm;

anthers 0.3–0.5 mm;

pistils 2(–3)-carpellate, ovary completely inferior or nearly so;

styles 2(–3), distinct, 0.8–1.1 mm.

hypanthium adnate to ovary to near its apex, 0.9–1.2 × 1–1.3 mm, strongly 8–10-ribbed in fruit, glabrous;

sepals deltate to triangular, 0.3–0.8 × 0.3–0.5 mm, margins entire, apex acute to acuminate, abaxial surface glabrous;

petals caducous, white to yellowish white, elliptic to narrowly ovate, 1.2–1.6 × 0.7–1.1 mm;

filaments 1.5–4.5 × 0.1–0.2 mm;

anthers 0.3–0.5 mm;

pistil 2(–3)-carpellate, ovary completely inferior or nearly so;

styles 2(–3), distinct, (0.6–)0.9–1.5 mm.

hemispheric, (1.2–)1.5–2.3 × (1.2–)2–2.8 mm.

hemispheric, (1.3–)1.7–2.8 × 1.8–3 mm.

0.3–0.6(–0.8) mm.

0.3–0.6(–0.8) mm.

flowers absent or present, white or greenish white, tube 4–21 mm, lobes 3–4(–5), obovate to broadly ovate, round, or elliptic, 6.5–15 × 2.5–14 mm.

flowers usually present, rarely absent, white or greenish white, tube 5–14 mm, lobes 3–4(–5), obovate to broadly ovate or round, 5–18 × 3–15 mm.

= 36.

= 36.