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 Tropical Africa :
  • CÉSAR J. & C. CHATELAIN (2019). Flore illustrée du Tchad. Conservatoire et Jardin botaniques de Genève, Coopération Suisse & Univ. N'Djaména : 88

Bibliography for Southern Africa :
  • Énum. Pl. Fleurs Afr. Trop. 3: 81 (1995).

Bibliography for North Africa :
  • BATTANDIER, J.A & L.C. TRABUT (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 (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
More information >> ( work in progress )
Record n°15706
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