Hydrilla Rich.

Symoens, J.J. (2009) Hydrocharitaceae Flora Zambesiaca 12(2)

Description of the genus

Submerged, freshwater, annual or perennial herbs. Roots simple, adventitious, without root-hairs, arising from nodes. Stems elongate, stoloniferous, or erect, terete, simple or branched from axils. Leaves sessile, opposite towards base of stem or branch, otherwise in whorls of 3–8(–12), linear to ovate, light to dark green, opaque or somewhat translucent, with 1 apical spine, margins hyaline, denticulate. Nodal scales 2 per leaf, narrowly triangular to narrowly lanceolate, fringed with orange-brown hairs. Flowers spathe solitary in leaf-axil, sessile, appendages at the apex, 1-flowered, shortly pedicellate, becoming detached and floating before anthesis; sepals 3, ovate, obtuse, reflexed at anthesis; petals 3, linear, obtuse, ± reflexed at anthesis; ovary of 3 carpels, 1-locular, placentation parietal. Fruit cylindric, smooth or with lateral spine-like appendages. Seeds up to 5, narrowly ellipsoid, smooth.

Worldwide: 13 species in tropical and subtropical Old World waters.

Zambia: 1 taxon.

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SpeciesFZ divisionsProvincesContent
verticillata (L.f.) RoyleNN

Other sources of information about Hydrilla:

Our websites:

Flora of Caprivi: cultivated Hydrilla
Flora of Mozambique: Hydrilla

External websites:

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

Copyright: Mike Bingham, Annette Willemen, Bart Wursten, Petra Ballings and Mark Hyde, 2011-24

Bingham, M.G., Willemen, A., Wursten, B.T., Ballings, P. and Hyde, M.A. (2024). Flora of Zambia: Genus page: Hydrilla.
https://www.zambiaflora.com/speciesdata/genus.php?genus_id=2347, retrieved 21 June 2024

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