Flora of North America species comparison

submersed with elongate internodes, or if emersed at early age, then procumbent.

2–12 cm, distal internode 1–6 cm.

1-flowered;

spathes 1–2.8 mm, glabrous.

opening within 1 hour after dawn, wilting by midday;

perianth blue or white, salverform, tube 11–29 mm, limbs essentially actinomorphic, lobes narrowly elliptic, 5.2–18.2 mm, proximal lobe longer, distal central lobe with lateral flanges toward base;

stamens unequal, lateral stamens 2.8–8 mm, central stamen 3.9–8.5 mm;

filaments linear, curved downward apically, glandular-pubescent;

style glabrous.

8–15-winged, 0.5–1 × 0.3–0.6 mm.

leaves submersed, forming basal rosette;

blade linear to oblanceolate, thickened, 2.4–5 cm × 2–4 mm.

leaves floating or emersed;

stipule 1–5 cm;

petiole 3–11 cm;

blade round to oblong, 1–5 cm × 5–25 mm, length equaling (or, on young plants, greater than) width, base cordate to truncate, apex obtuse.

= 14.