Flora of North America species comparison

decumbent, ascending, or erect, simple, sometimes few-branched, (8–)15–60 cm, sparsely to densely glandular-puberulent or glandular-pubescent proximally, glandular-puberulent distally.

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

blade lanceolate-ovate to ovate or oblong, rarely linear-lanceolate in submersed forms, 5–28 × 4–15 mm, margins with (3–)5–10(–12) pairs of sharp teeth, apex acute, rarely obtuse, surfaces sparsely to densely glandular-puberulent.

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.

slender, 10–23 mm, length 0.5–2 times bract, sparsely to densely glandular-puberulent;

bracteoles 2, 3.5–7 mm.

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

bracteoles 2, 2–4 mm.

sepals distinct, lanceolate to elliptic or ovate-lanceolate, 3–7 mm;

corolla 9–13 mm, tube yellowish brown, veins blue or lavender, limb white;

style 3–4 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.

globular, 1–2.5 × 1–2.5 mm.

ovoid, 2.2–4.5 × 2–3.5 mm.

0.3–0.4 mm.

0.4–0.6 mm.

= 16.

= 28.