Najas horrida Magn.

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Najas horrida

Photo: Helen Pickering
On the southern side of Bovu Island, Zambezi River

Najas horrida

Photo: Helen Pickering
On the southern side of Bovu Island, Zambezi River

Najas horrida

Photo: Mike Kennedy
Zambezi (FEOW: Middle Zambezi - Luangwa)

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Synonyms: Najas interrupta K. Schum.
Najas pectinata sensu T. Durand & Schinz
Common names: Saw-weed (English)
Status: Native
Submerged aquatic herb, 0.3-1 m high, forming dense clumps, sometimes with the upper leaftips just above the water. Stems much-branched. Leaves spreading to falcate, 3-29 mm long, sheathing at the base; margins with broadly triangular teeth, each tooth ending in a dark brown spine. Flowers unisexual on the same plant, inconspicuous, solitary, almost hidden in the sheathed axils of the leaves; male flower enclosed in a spathe, 1.3-3.5 mm long; female flower naked, c. 1.5-4 mm long. Fruit ellipsoid-oblong.
Derivation of specific name:
Flowering time:
Worldwide distribution: Widespread in Africa and Madagascar
Botswana distribution: N
Growth form(s): Aquatic.
Endemic status:
Red data list status:
Insects associated with this species:
Spot characters: Display spot characters for this species

Da Silva, M.C., Izidine, S. & Amude, A.B. (2004). A preliminary checklist of the vascular plants of Mozambique. Southern African Botanical Diversity Network Report No. 30 Sabonet, Pretoria Page 128.

Henderson, L. & Cilliers, C.J. (2002). Invasive Aquatic Plants Plant Protection Research Institute Handbook No. 16. Plant Protection Research Institute, Agricultural Research Council, South Africa. Pages 60 - 61. (Includes a picture).

Mapaura, A. & Timberlake, J. (eds) (2004). A checklist of Zimbabwean vascular plants Southern African Botanical Diversity Network Report No. 33 Sabonet, Pretoria and Harare Page 93.

Setshogo, M.P. (2005). Preliminary checklist of the plants of Botswana. Sabonet Report no. 37. Sabonet, Pretoria and Gaborone Page 126.

Symoens, J.J. & Triest, L. (2009). Najadaceae Flora Zambesiaca 12(2) Pages 60 - 63. (Includes a picture).

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 185.

Triest, L. (1987). A revision of the genus Najas L. (Najadaceae) in Africa and surrounding islandss Klasse voor Natuur- en Geneeskundige Wetenschappen Boek 21-4 Koninklijke Academie voor Overzeese Wetenschappen, Brussel Pages 44 - 52. (Includes a picture).

Other sources of information about Najas horrida:

Our websites:

Flora of Caprivi: Najas horrida
Flora of Malawi: Najas horrida
Flora of Mozambique: Najas horrida
Flora of Zambia: Najas horrida
Flora of Zimbabwe: Najas horrida

External websites:

African Plants: A Photo Guide (Senckenberg): Najas horrida
BHL (Biodiversity Heritage Library): Najas horrida
EOL (Encyclopedia of Life): Najas horrida
GBIF (Global Biodiversity Information Facility): Najas horrida
Google: Web - Images - Scholar
iNaturalist: Najas horrida
IPNI (International Plant Names Index): Najas horrida
JSTOR Plant Science: Najas horrida
Mansfeld World Database of Agricultural and Horticultural Crops: Najas horrida
Plants of the World Online: Najas horrida
Tropicos: Najas horrida
Wikipedia: Najas horrida

Copyright: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave, 2014-24

Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M. (2024). Flora of Botswana: Species information: Najas horrida., retrieved 19 May 2024

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