Flora of North America species comparison

submersed with elongate internodes, or emersed and procumbent.

submersed with elongate internodes, or emersed and short.

1–9 cm, distal internode 0.5–4 cm.

6–15 cm, distal internode 4–8.5 cm.

spicate, 2–8-flowered, elongating in 1 day, usually shorter than spathes, terminal flower sometimes extending beyond spathe apex;

spathes 0.8–5.5 cm, glabrous;

peduncle 0.5–4.2 cm, glabrous.

spicate, 7–24-flowered, elongating over several days;

spathes 1.2–4 cm;

peduncle 4–9 cm, glandular-pubescent when emersed.

opening ca. 3 hours after sunrise, wilting by early afternoon;

perianth white, salverform, tube 5–10 mm, limbs zygomorphic, lobes narrowly elliptic, 3–6.5 mm, distal central lobe with yellow or green region at base, sometimes with distal brown spot;

stamens unequal, lateral stamens 0.9–2.2 mm, filaments linear, pubescent with white multicellular hairs toward apex;

central stamen 2.2–4.7 mm, filament sparsely pubescent with multicellular hairs;

style pubescent with multicellular hairs.

2–10 per inflorescence opening each day;

perianth mauve, salverform, tube 2–6 mm, limbs zygomorphic, lobes narrowly elliptic, 8–13 mm, proximal lobe shorter;

stamens unequal, lateral stamens 2.7–7 mm, filaments obliquely inflated at center, bent upward apically, glabrous;

central stamen 5.9–10 mm, filament linear;

style glabrous.

8–14-winged, 0.5–0.9 × 0.3–0.5 mm.

12–15-winged, 0.7–1 × 0.6–0.9 mm, outer integument composed of additional surface layer of tetragonal to hexagonal isodiametric cells.

leaves forming basal rosette, blade linear to oblanceolate, thin, 2.4–3.7 cm × 3–8 mm.

leaves submersed and thin, or emersed and thickened, 5–15 cm × 1–6 mm.

leaves floating or emersed;

stipule 1–5 cm;

petiole 2–13 cm;

blade reniform, 1–4 × 1–5 cm, length equal to or less than width, apex obtuse.

leaves and stipules not produced.

= 48.