Flora of North America species comparison

simple or branched, to 23(–40) cm;

branches 1–4(or 5) pairs, ascending, from middle and distal cauline nodes;

cauline internode lengths 1–3(–5) times subtending leaves.

simple or branched, to 18 cm;

branches 1–4 pairs, from middle or distal cauline nodes;

cauline internode lengths 2–3 times leaves.

petiole 0–10(–13) mm;

blade long-orbiculate to triangular-ovate or oval, 2–10(–13) mm, margins crenate to incised-crenate, teeth 1–4(–6) pairs, apices obtuse to subacute.

blade ovate or elliptic, 3–10 mm, margins serrate, teeth 1–5 pairs, apices subacute to acute.

sparsely spicate, not 4-angled, beginning at node 3–7(–10);

proximal internode lengths 0.8–1.5 times bracts;

bracts green or suffused with purple, as broad as leaves, ovate or oval, length not more than 2 times width, 2–7 mm, base round, abaxial surface setulose on veins, adaxial puberulent and hairs eglandular, teeth 3–5(or 6) pairs, longer than wide, apices obtuse to acute, sinuses between teeth acute.

sparsely spicate, not 4-angled, beginning at node 7–11;

bracts green, purple, or blackish purple, broader than leaves, oblong to ovate, length not more than 2 times width, 4–8 mm, glossy, margins ciliate, surfaces glabrous and hairs eglandular, teeth 3–5 pairs, longer than wide, apices acute.

calyx lobes straight, apex acute;

corolla white or cream, abaxial lip lilac or purple, adaxial lilac, 2.5–4.5 mm, lips equal.

corolla white to violet, 4.5–6.5 mm, lips +/- equal.

oval to oblong or obovate, 2.5–5 mm, apex retuse to emarginate.

oblong or elliptic, 4–5.5 mm, apex truncate to retuse.

= 44 (Iceland).