Ceratophyllum demersum L.
var. demersum

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Ceratophyllum demersum var. demersum

Photo: Helen Pickering
Off Bovu Island, Zambezi River

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Synonyms: Ceratophyllum oxyacanthum Cham.
Ceratophyllum tuberculatum Cham.
Common names: Coontail (English) Rigid hornwort (English)
Status: Native
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.
Derivation of specific name:
Habitat: Occurring an most types of permanent fresh water, even in brackish estuaries, often forming thick mats just below the surface.
Altitude range: (metres) Up to 1600 m
Flowering time:
Worldwide distribution: Subcosmopolitan in temperate and tropical regions.
Zimbabwe distribution: N,W,C
Growth form(s): Aquatic.
Endemic status:
Red data list status:
Insects associated with this species:
Spot characters: Display spot characters for this species
Images last updated: Saturday 23 January 2010

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


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Other sources of information about Ceratophyllum demersum var. demersum:

Our websites:

Flora of Botswana: Ceratophyllum demersum var. demersum
Flora of Caprivi: Ceratophyllum demersum var. demersum
Flora of Malawi: Ceratophyllum demersum var. demersum
Flora of Mozambique: Ceratophyllum demersum var. demersum
Flora of Zambia: Ceratophyllum demersum var. demersum

External websites:

African Plant Database: Ceratophyllum demersum
Biodiversity Explorer (Biodiversity of southern Africa): Ceratophyllum demersum
EOL (Encyclopedia of Life): Ceratophyllum demersum
ePIC (electronic Plant Information Center): Ceratophyllum demersum
Flora Zambesiaca web site: Ceratophyllum demersum
Google: Web - Images - Scholar
GRIN (Germplasm Resources Information Network) taxonomy for plants report for Ceratophyllum demersum
IPNI (International Plant Names Index): Ceratophyllum demersum
Ispot Southern Africa : Ceratophyllum demersum
JSTOR Plant Science: Ceratophyllum demersum
Kew Herbarium catalogue: Ceratophyllum demersum
Tropicos: Ceratophyllum demersum
West African Plants database: Ceratophyllum demersum

Copyright: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave, 2002-16

Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M. (2016). Flora of Zimbabwe: Species information: Ceratophyllum demersum var. demersum.
http://www.zimbabweflora.co.zw/speciesdata/species.php?species_id=123480, retrieved 26 May 2016

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