Flora of North America species comparison

not aromatic, indistinctly petiolate;

petiole broadly winged;

blade without deep reticulate veins abaxially, spatulate, 8–15 × 2 cm, thin, margins irregularly and sharply dentate to sinuate-dentate, apex obtuse to acute, surfaces glabrous.

not aromatic, indistinctly petiolate;

petiole winged;

blade without deep reticulate veins abaxially, elliptic to oblanceolate, 1–4 × 1 cm, thin, margins usually crenulate or denticulate, rarely entire, apex obtuse, surfaces glabrous, often farinose when young, efarinose in age.

(6–)10–25-flowered;

involucral bracts plane, ± equal.

3–10-flowered;

involucral bracts plane, ± equal.

erect, thin, 10–30 mm, length 2–5 times bracts, flexuous.

erect at anthesis, relatively thin, to 5 mm, length to 1 times bracts, stiff.

heterostylous;

calyx green, campanulate, 3–5 mm;

corolla lavender, tube 8–10 mm, length 2 times calyx, eglandular, limb 10–16 mm diam., lobes 5–8 mm, apex emarginate.

heterostylous;

calyx green with purple stripes, campanulate, 4–6 mm;

corolla white, tube 4–7 mm, length 1–1.2 times calyx, eglandular, limb 6–10 mm diam., lobes 3–5 mm, apex deeply notched.

ellipsoid, length 1–2 times calyx.

ellipsoid, length 1–1.3 times calyx.

without flanged edges, reticulate.

without flanged edges, reticulate.

= 18.

= 18.