Ceratophyllum demersum L.
var. demersum
Selected images: Click on each image to see a larger version and details of the record View all images (8)
Photo: Helen Pickering
Off Bovu Island, Zambezi River
Photo: Mike Kennedy
Kasanka (FEOW: Bangweulu-Mweru)
Photo: Mike Kennedy
Kasanka (FEOW: Bangweulu-Mweru)
Species details: Click on each item to see an explanation of that item (Note: opens a new window)
Synonyms:
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Ceratophyllum oxyacanthum Cham. Ceratophyllum tuberculatum Cham.
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Common names:
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Coontail (English)
Rigid hornwort (English)
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Frequency:
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Status:
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Native |
Description:
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Submerged aquatic herb. Stems up to 3m long and 2 mm in diameter, longitudinally grooved. Leaves in whorls of 7-11, 8-40 mm long, filiform, forked 1-2(3) times; margin with spine-tipped teeth, particularly in the apical segments. Flowers axillary, unisexual on the same plant; male flowers in many 1-3-flowered clusters per branch; female flowers solitary, few per branch. Fruit ovoid, ellipsoid to obovoid with an apical spine and 2 prominent basal spines, and raised dark spots on the surface. |
Notes:
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Derivation of specific name:
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demersum: submerged, underwater |
Habitat:
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Flowering time: | |
Worldwide distribution:
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Subcosmopolitan in temperate and tropical regions. |
Botswana distribution:
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N,SE |
Growth form(s):
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Aquatic.
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Endemic status:
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Red data list status:
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Insects associated with this species:
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Spot characters:
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Display spot characters for this species |
Literature:
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Setshogo, M.P. (2005). Preliminary checklist of the plants of Botswana. Sabonet Report no. 37. Sabonet, Pretoria and Gaborone Page 46.
Timberlake, J.R. & Childes, S.L. (2004). Biodiversity of the Four Corners Area: Technical Reviews Volume Two (Chapter 5-15) Appendix 5-1: Plant Checklist Occasional Publications in Biodiversity 15 Page 203. As Ceratophyllum demersum
Wilmot-Dear, C.M. (1991). Ceratophyllaceae Flora Zambesiaca 9(6) Pages 125 - 127. (Includes a picture).
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Other sources of information about Ceratophyllum demersum var. demersum:
Our websites:
Flora of Caprivi:
Ceratophyllum demersum var. demersumFlora of Malawi:
Ceratophyllum demersum var. demersumFlora of Mozambique:
Ceratophyllum demersum var. demersumFlora of Zambia:
Ceratophyllum demersum var. demersumFlora of Zimbabwe:
Ceratophyllum demersum var. demersumExternal websites:
African Plants: A Photo Guide (Senckenberg):
Ceratophyllum demersumAfrican Plant Database:
Ceratophyllum demersumBiodiversity Explorer (Biodiversity of southern Africa):
Ceratophyllum demersumBHL (Biodiversity Heritage Library):
Ceratophyllum demersumEOL (Encyclopedia of Life):
Ceratophyllum demersumePIC (electronic Plant Information Center):
Ceratophyllum demersumFlora Zambesiaca web site:
Ceratophyllum demersumGBIF (Global Biodiversity Information Facility):
Ceratophyllum demersumGoogle:
Web -
Images -
ScholarGRIN (Germplasm Resources Information Network):
Ceratophyllum demersumIPNI (International Plant Names Index):
Ceratophyllum demersumIspot Southern Africa:
Ceratophyllum demersumJSTOR Plant Science:
Ceratophyllum demersumKew Herbarium catalogue:
Ceratophyllum demersumMansfeld World Database of Agricultural and Horticultural Crops:
Ceratophyllum demersumThe Plant List (version 1.1):
Ceratophyllum demersumTropicos:
Ceratophyllum demersum
Copyright: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave, 2014-18
Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M.
(2018).
Flora of Botswana: Species information: Ceratophyllum demersum var. demersum. https://www.botswanaflora.com/speciesdata/species.php?species_id=123480, retrieved 27 April 2018
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