African Plant Database

Spirodela polyrrhiza (L.) Schleid.
Family : Lemnaceae
Protologue : Linnaea 13: 392 (1839)
Information on the genus : Spirodela
Basionym : Lemna polyrhiza L.
Status for NA : accepted (present)
Status for SA : accepted (present)
Status for TA : accepted (present)
Synonym(s) Homotypic
 Lemna polyrhiza L. (1753)
Synonym(s) Heterotypic
=Spirodela maxima McCann (1942)
=Telmatophace orbicularis (Kit. ex Schult.) Schur
Ecology and distribution
Trop. Afr.
Biology : Free-floating aquatic herb, numerous individuals often cohering or floating together; frond orbicular-ovate, 3-8x3-8 mm, sometimes tinged pink above, purplish beneath, thin, with 5-12 prominent veins; daughter fronds budding from near point of root insertion in a slit of the mother frond; roots 7-21 from a thickened basal part of frond; root-cap acute; turions (in unfavourable conditions) small, orbicular-reniform, rootless, sinking to bottom of water body; fruit winged at edges and near top; seeds 12-20-ribbed.
Ecology : Fresh still water, usually in eutrophic conditions, in regions with warm summers; lakes, large dams, among reeds, often with Lemna, Wolffia; in impounded water of dams forming a dense cover together with Pistia stratiotes, Salvinia, which harbours snails and their eggs, vectors of the schistosome parasite (Burkill, 1995: l.c.); 0-2000 m alt.
  Widespread in Africa: Morocco, Egypt, S. Africa, Madagascar; almost cosmopolitan, but in S. America only in the NW part
South. Afr.
Biol./Eco : annual-Herb, Hydrophyte, Pleustophyte- Alt: 1 - 1340 m. Distribution: BOT, FS, KN

Bibliography for Tropical Africa :
  • Darbyshire, I. Kordofami, M. & al. (2015). The plants of Sudan and south Sudan, An annoted checklist. Kew Publishing

Bibliography for Southern Africa :
  • LEBRUN, J. P. & A. L. STORK (1995). Enumération des plantes à fleurs d’Afrique tropicale. Monocotyledones: Limnocharitaceae à Poaceae. Énum. Pl. Fleurs Afr. Trop. 3: 81

Bibliography for North Africa :
  • Fl. Afrique N. 4: 253 (1957). 
  • Fl. Eur. 5: 273 (1980).
  • BOULOS, L. (1995). Flora of Egypt. Checklist.
  • Fl. Egypt (Boulos) 4: 112 (2005).
  • FENNANE, M., M. IBN TATTOU, J. MATHEZ, A. OUYAHYA & J. EL OUALIDI (éd.) (2014). Flore Pratique du Maroc [vol.3] Trav. Inst. Sci. Univ. Mohammed V, Sér. Bot. 3: 341

Bibliography other :
  • Von Raab-Straube E. & T. Raus (2018). Euro+Med-Checklist Notulae, 9 Willdenowia 48(2): 197 
More info on :
see under Jstor_African Plant Initiative
see under The Euro-Mediterranean Plant Base
see under Flore d'Afrique Centrale
see under The International Plant Name Index
see under Missouri Botanical Garden
see under Flora of Zimbabwe
see under Herbarium, North Africa MPU
carte afrique num 15703
Record n°15703 modified 2013-09-11
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