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Ceratophyllum demersum
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)
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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. demersumFlora 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 demersumAfrican 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
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