2201.030 Persicaria (L.) Mill. - Knotweeds

Ronse Decraene, L.-P. & Akeroyd, J.R. (1988) Generic limits in Polygonum and related genera (Polygonaceae) on the basis of floral characters Botanical Journal of the Linnean Society 98 321-371

Description of the genus

Annual or perennial herbs, usually (in ours) erect. Ochreae present. Leaves large compared to Polygonum, usually more than 5 cm. Each inflorescence with usually more than 6 flowers, some or all inflorescences terminal, bracts similar to the leaves. Perianth segments mostly 5, petaloid, not enlarging in fruit. Stamens 8 (or 4-7 by reduction). Styles 2-3; nut biconvex or 3-angled.

Worldwide: c. 150 species, ± cosmopolitan

Malawi: 12 taxa.

The larvae of the following species of insect eat species of this genus:
Comostilopsis stillata (Pink-laced Emerald)
Rhodometra sacraria (Vestal)
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Links to taxa:     View: living plant images - herbarium specimen images - all images for this genus

SpeciesFZ divisionsContent
barbata (L.) H. HaraN,S
capitata (Buch.-Ham. ex D. Don) H. GrossSDescription, Image
decipiens (R. Br.) K.L. WilsonN,C,SDescription, Image
glomerata (Dammer) S. Ortiz & PaivaN,C,S
lapathifolia (L.) GrayC,SDescription
limbata (Meisn.) H. HaraC,SDescription, Image
madagascariensis (Meisn.) S. Ortiz & PaivaN,C,SDescription, Image
nepalensis (Meisn.) H. GrossN,C,SDescription, Image
senegalensis (Meisn.) SojákN,C,SDescription, Image
senegalensis f. albotomentosa (R.A. Graham) K.L. WilsonN,C,SDescription, Image
setosula (A. Rich.) K.L. WilsonN,C,S
strigosa (R. Br.) H. GrossN,C,SDescription, Image

Other sources of information about Persicaria:

Our websites:

Flora of Botswana: Persicaria
Flora of Caprivi: Persicaria
Flora of Caprivi: cultivated Persicaria
Flora of Mozambique: Persicaria
Flora of Zambia: Persicaria
Flora of Zimbabwe: Persicaria
Flora of Zimbabwe: cultivated Persicaria

External websites:

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

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 Malawi: Genus page: Persicaria.
https://www.malawiflora.com/speciesdata/genus.php?genus_id=516, retrieved 18 April 2024

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