perennial, rhizomatous, caulescent; turions absent. Leaves alternate, floating [submersed], petiolate [sessile]; sheath not persisting longer than blade
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late in growing season. Leaves arising directly from rhizome, alternate, floating or emersed; petiole long. Leaf-blade peltate, orbiculate, margins entire;
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Treatment appears in FNA Volume 22. Treatment on page 151. Roots absent. Fronds floating or submersed (only turions sink to bottom), 1 or 2, coherent, each frond
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stolons present. Stems floating on or suspended in water, rooted or not, unbranched, short. Leaves basal, emergent or floating, petiolate; blade cordate
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Baker J. Bot. 24: 98. 1886. Clifton E. Nauman Common names: Water spangles floating fern. Illustrated Treatment appears in FNA Volume 2. Treatment on page
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Pl. 2: 190. 1818. Charles J. Sheviak Common names: Water-spider orchid Floating orchid water orchid Illustrated Synonyms: Habenaria nuttallii Small Treatment
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3, 8: 186. 1821. Robert M. Lloyd Common names: Antler ferns water ferns floating ferns Etymology: Greek cerato, horned, and pteris, fern, referring to the
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rounded; sheath not winged. Stipes white, thin, often decaying. Fronds floating, 1 or 2–5 or more, coherent in groups, obovate, often gibbous, 1–8 mm,
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linear or sometimes oblanceolate, apex acuminate to obtuse. Petiolate leaves floating or emersed; blade reniform, cordate, or oblong, membranous, apex acute
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glabrous (or sheathing leaf-bases sometimes pubescent). Stems creeping or floating, not bulbous-based, without bulbils. Roots nodal, never tuberous. Leaves
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submersed and floating; petiole short to long. Submersed leaves: blade in 3-7 dichotomously [trichotomously] branched, linear segments. Floating leaves: blade
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Illustrator: John Myers Copyright: Flora of North America Association Stems leafy, floating or creeping, rooting at nodes. Basal leaves: blade ovate-reniform or cordate
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Treatment on page 54. Plants perennial; aquatic, usually rooted, sometimes floating; stoloniferous, sometimes mat-forming; monoecious. Culms 10-100+ cm, erect
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10–35 cm; glands absent. Turions absent. Leaves both submersed and floating or floating absent, spirally arranged. Submersed leaves sessile, lax; stipules
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appears in FNA Volume 10. Herbs, annual, aquatic, rosette-forming, rooted or floating, to 50 dm (when rooted in deep water), glabrous or velutinous. Stems submerged
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remainder of blade. Inflorescences racemes or panicles, of 1–15 whorls, floating or emersed, 1.5–28 × 1.5–15 cm; peduncles 15–47 cm; bracts distinct or
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rhizomatous or cespitose; synoecious. Culms 20-150 cm (occasionally longer in floating mats), erect or decumbent, often rooting at the nodes, branched or unbranched
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viscid-aromatic, pilose, sometimes sparsely so, producing long, juvenile, floating basal leaves. Culms 3-35 cm, erect, ascending, or decumbent, sometimes
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the aquatic habitat Treatment appears in FNA Volume 22. Herbs, aquatic, floating on still or slow-moving water. Stolons frequently produced, terminating
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terminal segments 3-200, linear to slightly spatulate, to 1.8 mm wide. Floating leaves: blade 0.6-3 cm × 1-4 mm, margins entire or notched to sagittate
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