Abstract
Submersed, herbaceous, hydrophilous perennials; roots (even embryonic) absent. Herbage glabrous. Stems flexuous or brittle, freely suspended or anchored into the hydrosoil by slender rhizoidal branches; branching irregular. Leaves opposite at first plumule node, whorled otherwise; exstipulate; petioles inconspicuous, light-colored; laminas simple-linear or divided dichotomously into linear filiform segments; segments with 2 submarginal rows of persistent thorn-like denticles; segment apices tipped by a medial multicellular mucilaginous appendage. Plants monoecious. Staminate and pistillate inflorescences one-flowered or occasionally with vestigial branches; extra-axillary and alternating with the leaves, 1 to several at a node in distal portions of the shoots, sessile or with peduncles lengthening in fruit, subtended by involucres of basally connate, foliaceous bracts. Staminate flowers actinomorphic; naked; pedicels very short; stamens 3 to numerous, arranged spirally, maturing centripetally; filaments short; anthers 2-celled, dehiscing longitudinally; connective projecting as an apical medial appendage, flanked by 2 to several small denticles.
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Les, D.H. (1993). Ceratophyllaceae. In: Kubitzki, K., Rohwer, J.G., Bittrich, V. (eds) Flowering Plants · Dicotyledons. The Families and Genera of Vascular Plants, vol 2. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-02899-5_24
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DOI: https://doi.org/10.1007/978-3-662-02899-5_24
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