Flora of North America species comparison

simple or branched, to 25(–35) cm;

branches 1–5(or 6) pairs, from proximal, middle, or distal cauline nodes;

cauline internode lengths 2–4 times subtending leaves.

blade usually broadly ovate, 3–16 mm, margins serrate, teeth 1–6 pairs, apices acute.

beginning at node 3–5;

bracts green or purplish adaxially, broader than leaves, broadly ovate or deltate, length not more than 2 times width, (4–)5–9(–11) mm, surfaces glabrous or setose and hairs eglandular, sometimes pubescent and hairs glandular, stalks 1- or 2-celled, 0.1–0.2 mm, teeth 3–6 pairs, as long as or much longer than wide, apices acute to acuminate.

corolla white, sometimes lilac, adaxial lip lilac, 6–11(–13) mm, abaxial lip exceeding adaxial.

oblong to elliptic or obovate, 4.5–8 mm, apex truncate to retuse.