Flora of North America species comparison

decumbent to ascending or erect, simple or few-branched, (5–)15–22 cm, glabrous or glandular-puberulent distally.

decumbent to ascending or erect, simple or few-branched, 5–47 cm, glabrous proximally, sparsely glandular-puberulent distally.

blade linear-lanceolate to lanceolate-ovate, 7–20(–32) × 1.5–5(–7) mm, margins entire, rarely with 1 or 2 pairs of teeth distally, apex acuminate to attenuate, surfaces glabrate or glandular-pubescent.

blade lanceolate-ovate to oblong or ovate-elliptic, sometimes linear-lanceolate on submerged plants, 5–26 × (1.5–)3–7(–9) mm, margins entire or with 1 or 2 pairs of teeth, apex obtuse, rarely acute, surfaces glabrous.

stout, (3–)7–25 mm, length 0.5–2.5 times bract, glabrous or obscurely glandular-pubescent distally;

bracteoles 0.

slender, (3–)5–20 mm, length 0.4–2.1 times bract, sparsely glandular-puberulent;

bracteoles 2, 2–4 mm.

sepals distinct, lanceolate, (4–)7–11 mm;

calyx slightly bilaterally symmetric;

corolla 5–8(–10) mm, tube yellowish green or yellow, veins purple, limb white to pinkish white;

style 2–3 mm.

sepals distinct, linear-lanceolate to lanceolate, 3.5–7 mm;

corolla 8–15 mm, tube and limb yellow, rarely white or cream, veins yellow to orangish yellow, rarely white;

style 3.5–5 mm.

subglobular, 3–6 × 3.5–5 mm.

ovoid, 2.2–4.5 × 2–3.5 mm.

0.4–0.9 mm.

0.4–0.6 mm.

= 28.