African Plant Database

Wolffia arrhiza (L.) Horkel ex Wimm.
Family : Lemnaceae
Protologue : Fl. Schles., ed. 3 140 (1857)
Information on the genus : Wolffia
Basionym : Lemna arrhiza L.
Status for NA : accepted (present)
Status for SA : accepted (present)
Status for TA : accepted (introduced)
Synonym(s) Homotypic
 Lemna arrhiza L. (1771)
 Horkelia arrhiza (L.) Druce
Synonym(s) Heterotypic
=Bruniera vivipara Franch.
Ecology and distribution
Trop. Afr.
Biology : Aquatic perennial; frond spherical to ellipsoid, 0,5-1,5x0,4-1,2 mm, shiny (not translucent) and flattened above, with 10-100 stomata, paler green beneath; for flower structure, see Kuoh & al., o.c.; plants rarely fruiting.
Ecology : Ditches, pools; fresh and still waters; sometimes abundant enough to form a scum; sometimes mixed with Wolfiella, Lemna minor; also with Pistia (collected and used as a manure); 0-2100 m alt.
  Canary Isl.; Morocco, Algeria; Botswana, S. Africa; Madagascar; Europe; W Asia. Introduced to S. America, Brazil, Colombia.
South. Afr.
Biol./Eco : perennial-Herb, Hydrophyte, Pleustophyte- Alt: 2 - 1600 m. Distribution: BOT, EC, FS, GA, KN, MP, WC

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 :
  • BATTANDIER, J. A. & TRABUT, M. (1918). Choix de plantes nouvelles pour le Maroc ou pour la Science dans les fructueuses récoltes de Mr. Ducelier. Bull. Soc. Hist. Nat. Afrique N. 9: 17  
  • Cat. Pl. Maroc 1: 110 (1931). 
  • Fl. Afrique N. 4: 254 (1957). 
  • Fl. Algérie [Quézel & Santa] 1: 182 (1962).
  • Fl. Eur. 5: 273 (1980).
  • VALDES, B., S. TALAVERA & E. FERNANDEZ-GALIANO (ed.) (1987). Flora Vascular de Andalucía Occidental, vol. 3 3: 211 
  • HANSEN, A. & P. SUNDING (1993). Flora of Macaronesia. Checklist of vascular plants. 4. revised edition Sommerfeltia 17: 1-295
  • 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): 198
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 Herbarium, North Africa MPU
carte afrique num 15706
Record n°15706
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