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 0.5–3 cm;

blade simple, elliptic to lanceolate, 1.5–8 × 1–4 cm, margins entire or nearly so, base cuneate to attenuate.

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

extra-axillary, unbranched or rarely forked, umbel-like, 3–8-flowered, 1–2 cm.

erect and 0.2–0.5 cm in flower and fruit.

0.5–1 cm in flower and fruit, recurved to reflexed 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, 1.5–3 mm, sparsely pubescent, lobes deltate, reflexed in fruit;

corolla white with yellowish central star, stellate, 1–1.5 cm diam., with sparse interpetalar tissue;

stamens equal;

anthers ellipsoidal, 2–3 mm, dehiscent by terminal pores that open into longitudinal slits;

ovary glabrous.

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

dull purplish black, globose, 0.5–1.5 cm diam., glabrous, without (or rarely with 2) sclerotic granules.

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

pale yellow, flattened, 1–1.3 × 0.8–0.9 mm, minutely pitted.

= 24.

= 24.