Flora of North America species comparison

petiolate;

petiole 1–4 cm;

blade simple, ovate to ovate-elliptic, 2–10.5 × 1–4.5 cm, margins entire or shallowly sinuate-dentate, base decurrent.

petiolate;

petiole 1.5–4 cm, with pair of entire lunate pseudostipules at base;

blade compound, elliptic to ovate, 7.5–20 × 3.5–8 cm, margins divided with 1–4 pairs of leaflets, these sometimes interspersed with smaller, interjected leaflets, lowermost leaflets sometimes greatly reduced in size, leaflet margins entire, base cuneate to cordate.

extra-axillary or leaf-opposed, unbranched, usually umbel-like, 3–10-flowered, 0.5–3 cm.

terminal, extra-axillary or leaf-opposed, generally forked or 3-fid, 3–26-flowered, to 10 cm.

erect or spreading, 0.3–1 cm in flower, to 1.5 cm in fruit.

articulated near middle, 1.1–3.7 cm in flower and fruit.

radially symmetric;

calyx somewhat accrescent, unarmed, 1–3 mm, lobes deltate, strongly reflexed in fruit;

corolla white, sometimes with yellowish central star, stellate, 0.4–0.8 cm diam., without interpetalar tissue;

stamens equal;

anthers ellipsoidal, 0.7–1.5 mm, dehiscent by terminal pores that open into longitudinal slits;

ovary glabrous.

radially symmetric;

calyx not accrescent, unarmed, 4–8 mm, lobes deltate-acuminate;

corolla purple, blue, pale pink, or rarely white, pentagonal to rotate, 1.8–3.3 cm diam., with abundant interpetalar tissue;

stamens equal;

anthers oblong, slightly tapered, 3.5–6.5 mm, dehiscent by terminal pores that open into longitudinal slits;

ovary glabrous.

shiny purplish black, globose, 0.5–1 cm diam., glabrous, with (0–)2–4(–6) sclerotic granules, usually 2–4 larger and 2 smaller.

green, sometimes with dark green stripes or white spots, globose or slightly ovoid, 0.9–1.7 cm diam., glabrous, without sclerotic granules.

pale yellow to brown, 1–1.5 × 0.5–1.5 mm, minutely pitted.

greenish white, rounded, 1–2 mm diam., rugose.

= 24.

= 48.