Hydrilla Rich.

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.

Mozambique: 1 taxon.

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SpeciesFZ divisionsContent
verticillata L.f.) RoyleM

Other sources of information about Hydrilla:

Our websites:

Flora of Zambia: Hydrilla

External websites:

ePIC (electronic Plant Information Center): Hydrilla
Flora Zambesiaca web site: Hydrilla
Google: Web - Images - Scholar
GRIN (Germplasm Resources Information Network) taxonomy for plants report for Hydrilla
IPNI (International Plant Names Index): Hydrilla
Kew Herbarium catalogue: Hydrilla
Kew Monocotyledon checklist: Hydrilla

Copyright: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave 2007-17

Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M. (2017). Flora of Mozambique: Genus page: Hydrilla.
http://www.mozambiqueflora.com/speciesdata/genus.php?genus_id=2347, retrieved 13 December 2017

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