Potamogeton nodosus Poir.

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Photo: Bart Wursten
Small dam in forest off the Woodland Rd, Vumba

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Synonyms:	Potamogeton fluitans sensu auct.
Common names:	Broad-leaved pondweed (English)
Frequency:
Status:	Native
Description:	Herb, with stems to 1 m, arising from a woody rhizome. Stipules variable in size (up to 6 cm), open, convolute, membranous, lower amplexicaul, upper spreading, ovate, acuminate. Upper leaves floating and sometimes aerial on mud, submerged ones often soon decaying; all leaves petiolate. Submerged leaves: 8-20 × 0.8-1.6 cm, linear to linear-lanceolate, thin, tapering to apex; floating leaves: 5(-8) × 2.5(-3.5) cm, elliptic to ovate, coriaceous; apex rounded to acute; leaves intermediate between the two forms occur. Leaves of land forms usually smaller. Spikes on ± swollen, arcuate scapes, many-flowered. Drupe c.4 mm, rounded, flattened; beak short.
Notes:	In FZ, plants formerly known as P. thunbergii are treated as either P. nodosus and P. richardii. Our images from the Vumba have been provisionally placed under P. nodosus but further work is needed to establish if this is correct.
Derivation of specific name:
Habitat:	In ponds and dams, usually floating, occasionally emergent on mudbanks.
Altitude range: (metres)
Flowering time:	Sep - Apr
Worldwide distribution:	Widespread in Africa, Madagascar, Indian Ocean islands, Europe, Asia, and North and Central America.
Zimbabwe distribution:	N,W,C,E
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 14 April 2007
Literature:	Chapano, C. & Mugarisanwa, N.H. (2003). Plants of the Matobo District National Herbarium and Botanic Garden, Zimbabwe Page 29. As Potamogeton thunbergii Heath, A. & Heath, R. (2009). Field Guide to the Plants of Northern Botswana including the Okavango Delta Kew Publishing Page 191. (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 112. as Potamogeton thunbergii Pooley, E. (1998). A Field Guide to the Wild Flowers of KwaZulu-Natal and the Eastern Region. Natal Flora Publications Trust. Durban. Pages 502 - 503. (Includes a picture). Setshogo, M.P. (2005). Preliminary checklist of the plants of Botswana. Sabonet Report no. 37. Sabonet, Pretoria and Gaborone Page 148. as Potamogeton thunbergii Symoens, J.J. (2009). Potamogetonaceae Flora Zambesiaca 12(2) Pages 89 - 90. 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 193. as Potamogeton thunbergii

Other sources of information about Potamogeton nodosus:

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Flora of Botswana: Potamogeton nodosus
Flora of Burundi: Potamogeton nodosus
Flora of Caprivi: Potamogeton nodosus
Flora of Zambia: Potamogeton nodosus

External websites:

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