• P. S. Williamson
  • E. L. Schneider
Part of the The Families and Genera of Vascular Plants book series (FAMILIES GENERA, volume 2)


Aquatic, herbaceous perennials, producing cylindrical, slender, elongate, branching rhizomes which root at the nodes. Submersed parts of the plant covered with a gelationous sheath. Leaves simple, petiolate, floating or submersed; phyllotaxy alternate or opposite (decussate), rarely whorled (ternate). Floating blades narrowly-broadly elliptic, peltate, margins entire; venation actinodromous. Submersed blades palmately dissected into 5–7 parts, each part divided dichotomously and trichotomously several times into many narrow linear segments (Cabomba) or entire, non-peltate in juvenile leaves of Brasenia. Flowers, typically emergent, solitary on long axillary or extra-axillary peduncles, perfect, actinomorphic, and hypogynous. Sepals (2−)3(−4), petals (2−)3(−4), stamens 3–36. Carpels (1−)2–18, apocarpous. Ovules (1−)2–3, anatropous. Fruits aggregate with leathery pericarp; indéhiscent or dehiscent with 1–3 operculate seeds.


Pollination Biology Floral Anatomy Floating Leaf Foliar Sclereid Receptive Stigma 
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

Authors and Affiliations

  • P. S. Williamson
  • E. L. Schneider

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