• D. H. Les
Part of the The Families and Genera of Vascular Plants book series (FAMILIES GENERA, volume 2)


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.


Pollen Tube Staminate Flower Pistillate Flower Short Shoot Pistillate Inflorescence 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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© Springer-Verlag Berlin Heidelberg 1993

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  • D. H. Les

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