Flora of North America species comparison

erect, simple or few-branched, (7–)9–21(–29) cm, glabrous or glabrate proximally, glabrate or glandular-puberulent distally.

ascending or erect, few- to much-branched, rarely simple, (4–)10–40 cm, glabrous or glandular-puberulent proximally, glandular-puberulent distally.

dimorphic, submersed basal and clustered, floating paired at ends of branches to 70 mm, blade of submersed lanceolate to oblanceolate or oblong, 1–7 × 0.5–3 mm, margins entire, apex obtuse to acute, surfaces glabrous, blade of floating elliptic to ovate or nearly round, 3–10 × 2–9 mm, margins entire, apex obtuse to rounded or retuse, surfaces glabrous.

blade linear to narrowly elliptic, oblanceolate, or elliptic-obovate, rarely falcate, 10–65 × 3–11(–18) mm, margins with (1 or)2–5(–7) pairs of blunt to sharp teeth, apex acute, surfaces glabrate or glandular-puberulent.

stout, 0.1–3 mm, length less than 0.1 times bract, glabrous;

bracteoles 0.

slender, 8–35 mm, length (0.3–)0.4–0.9(–1.3) times bract, sparsely to densely glandular-puberulent;

bracteoles 2, 2.5–7 mm.

sepals connate proximally, calyx lobes obovate to oblong, 0.7–1 mm;

corolla 3–4 mm, tube and limb white tinged pink or purple, veins lavender or purple;

style 0.5–1 mm.

sepals distinct, lanceolate to narrowly lanceolate-elliptic, 2.5–6 mm;

corolla 7–12 mm, tube yellow, yellowish white, or yellowish green, veins brownish violet, limb white, sometimes tinged lavender;

style 3–4 mm.

bilaterally symmetric, obcordiform, 2–3 × 3–4 mm.

ovoid, 2.6–6 × 3–5 mm.

(0.3–)0.4–0.5 mm.

0.4–0.7 mm.

= 18.

= 14, 16.