Flora of North America species comparison

branched, rarely simple, to 30 cm;

branches 1–5 pairs, from middle and distal cauline nodes;

cauline internode length 0.5–2 times subtending leaves.

simple or branched, to 25(–42) cm;

branches 1–7 pairs, from middle or distal cauline nodes;

cauline internode lengths 2–3 times subtending leaves.

blade narrowly oblong to ovate-oblong, 2–9(–12) mm, margins serrate, teeth 1–3 pairs, apices subacute to aristate.

blade oval to oblong or ovate, 2–10 mm, margins serrate, teeth 1–5(or 6) pairs, apices subacute, sometimes aristate.

beginning at node (5–)7–9(–11);

bracts green, sometimes purple adaxially, broader than leaves, oblong to ovate, length not more than 2 times width, 5–10 mm, surfaces glabrous or sparsely to densely hirsute and hairs eglandular, sometimes glandular-pubescent and hairs glandular, stalks 1- or 2-celled, 0.1–0.2 mm, teeth 4 or 5 pairs, longer than wide, apices acute, sometimes aristate.

sparsely spicate, not 4-angled, beginning at node (7–)10–12;

bracts green, sometimes purplish adaxially, broader than leaves, oblong to ovate, length not more than 2 times width, 5–8 mm, not glossy, margins ciliate, surfaces glabrous or hirsute and hairs eglandular, teeth 4–6 pairs, longer than wide, apices acute to long-aristate.

corolla white, usually suffused with lilac, 8–10 mm, abaxial lip exceeding adaxial.

corolla white to lilac, 5–7.5(–8.5) mm, lips +/- equal.

narrowly oblong, 4.5–6 mm, apex truncate to retuse.

narrowly oblong, 4–5.5 mm, apex truncate to retuse.

= 44 (England).