Ceratophyllaceae, Hornwort Family

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Ceratophyllaceae
Hornwort Family

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Marsh Hornworts

They are usually called hornworts, although this name is also used for unrelated plants of the division Anthocerotophyta.

Ceratophyllum grows completely submerged, usually, though not always, floating on the surface, and does not tolerate drought. The plant stems can reach 1–3 m in length. At intervals along nodes of the stem they produce rings of bright green leaves, which are narrow and often much-branched. The forked leaves are brittle and stiff to the touch in some species, softer in others. The plants have no roots at all, but sometimes they develop modified leaves with a rootlike appearance, which anchor the plant to the bottom. The flowers are small and inconspicuous, with the male and female flowers on the same plant. In ponds it forms thick buds in the autumn that sink to the bottom which give the impression that it has been killed by the frost but come spring these will grow back into the long stems slowly filling up the pond.

* Ceratophyllum demersum L. (Rigid Hornwort or Common Hornwort)
* Ceratophyllum echinatum A.Gray (Spineless Hornwort)
* Ceratophyllum muricatum Cham. (Prickly Hornwort)
* Ceratophyllum platyacanthum Cham.
* Ceratophyllum submersum L. (Soft Hornwort or Tropical Hornwort)

These branches come from Ceratophyllaceae :

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