Ceratophyllum demersum L.
var. demersum

Selected images: Click on each image to see a larger version and details of the record View all images (3)

Ceratophyllum demersum var. demersum

Photo: Helen Pickering
Off Bovu Island, Zambezi River

Ceratophyllum demersum var. demersum

Photo: Mike Kennedy
Kasanka (FEOW: Bangweulu-Mweru)

Ceratophyllum demersum var. demersum

Photo: Mike Kennedy
Kasanka (FEOW: Bangweulu-Mweru)

Detailed records: Display species records QDS maps by: Google Maps Point records by Google Maps

Species details: Click on each item to see an explanation of that item (Note: opens a new window)

Synonyms: Ceratophyllum oxyacanthum Cham.
Ceratophyllum tuberculatum Cham.
Common names: Coontail (English) Rigid hornwort (English)
Frequency:
Status: Native
Description:
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:
Derivation of specific name: demersum: submerged, underwater
Habitat:
Flowering time:
Worldwide distribution: Subcosmopolitan in temperate and tropical regions.
Botswana distribution: N,SE
Growth form(s): Aquatic.
Endemic status:
Red data list status:
Insects associated with this species:
Spot characters: Display spot characters for this species
Literature:

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).

Other sources of information about Ceratophyllum demersum var. demersum:

Our websites:

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
Flora of Zimbabwe: Ceratophyllum demersum var. demersum

External websites:

African Plants: A Photo Guide (Senckenberg): Ceratophyllum demersum
African Plant Database: Ceratophyllum demersum
Biodiversity Explorer (Biodiversity of southern Africa): Ceratophyllum demersum
BHL (Biodiversity Heritage Library): Ceratophyllum demersum
EOL (Encyclopedia of Life): Ceratophyllum demersum
ePIC (electronic Plant Information Center): Ceratophyllum demersum
Flora Zambesiaca web site: Ceratophyllum demersum
GBIF (Global Biodiversity Information Facility): Ceratophyllum demersum
Google: Web - Images - Scholar
GRIN (Germplasm Resources Information Network): Ceratophyllum demersum
IPNI (International Plant Names Index): Ceratophyllum demersum
Ispot Southern Africa: Ceratophyllum demersum
JSTOR Plant Science: Ceratophyllum demersum
Kew Herbarium catalogue: Ceratophyllum demersum
Mansfeld World Database of Agricultural and Horticultural Crops: Ceratophyllum demersum
The Plant List (version 1.1): Ceratophyllum demersum
Tropicos: Ceratophyllum demersum


Copyright: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave, 2014-17

Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M. (2017). Flora of Botswana: Species information: Ceratophyllum demersum var. demersum.
http://www.botswanaflora.com/speciesdata/species.php?species_id=123480, retrieved 24 October 2017

Site software last modified: 26 December 2016 9:08pm
Terms of use