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 to erect, simple or few-branched, 10–35 cm, glabrous or glabrate 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-lanceolate to lanceolate-ovate, 7–20 × 1–3 mm, margins entire or with 1 or 2(or 3) pairs of blunt teeth distally, apex acute, surfaces glabrate or sparsely glandular-puberulent.

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

bracteoles 0.

slender to stout, 6–17 mm, length 0.8–2 times bract, sparsely to densely glandular-puberulent;

bracteoles 0 or 1, 0.8–1 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, linear to narrowly lanceolate or oblong, 3–6 mm;

corolla 10–14 mm, tube greenish yellow, veins yellow, brownish yellow, or purple, limb white;

style 2–4 mm.

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

subglobular to ovoid, 1.2–2 × 1.2–2 mm.

(0.3–)0.4–0.5 mm.

0.2–0.3 mm.

= 18.

= 14.