Flora of North America species comparison

petiolate;

petiole 1–8 cm;

blade simple, elliptic to ovate, 11–31 × 4–14 cm, margins entire, base acute, often with smaller axillary leaves.

petiolate;

petiole 0.5–2 cm;

blade simple, elliptic to elliptic-ovoid, 1–4.5 × 0.5–2.5 cm, margins entire, base rounded to obtuse and often decurrent.

terminal, becoming leaf-opposed, much-branched, 50–100-flowered, 5–24 cm.

nearly sessile, extra-axillary or subopposite leaves, unbranched, racemelike, 1–5-flowered.

erect and 0.2–0.5 cm in flower and fruit.

0.5–1.2 cm in flower, 1–2 mm and spreading or nodding in fruit.

radially symmetric;

calyx slightly accrescent, unarmed, 4–7.5 mm, densely pubescent, lobes deltate;

corolla purple, stellate-pentagonal, 1–1.5 cm diam., with abundant interpetalar tissue;

stamens equal;

anthers oblong, 2–3.5 mm, dehiscent by terminal pores that open into longitudinal slits;

ovary tomentose.

radially symmetric;

calyx not accrescent, unarmed, 3–9 mm, moderately to densely pubescent, lobes linear-lanceolate;

corolla white, rotate, 0.5–1 cm diam., with abundant interpetalar tissue;

stamens equal;

anthers oblong, slightly tapered, 1.5–3 mm, dehiscent by terminal pores that open into longitudinal slits;

ovary glabrous.

yellow, globose, 1–1.5 cm diam., tomentose, without sclerotic granules.

white to greenish and semitransparent, globose, 5–12 mm diam., glabrous, without sclerotic granules.

yellowish brown, flattened, 1.5–2.5 × 1.5–2 mm, minutely pitted.

light brown, somewhat flattened, ca. 2.5 × 1.5 mm, notched where connected to placenta, ridged.

= 24.