Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Datasheet

Allium neapolitanum
(False onion weed)

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Datasheet

Allium neapolitanum (False onion weed)

Summary

  • Last modified
  • 22 November 2019
  • Datasheet Type(s)
  • Invasive Species
  • Preferred Scientific Name
  • Allium neapolitanum
  • Preferred Common Name
  • False onion weed
  • Taxonomic Tree
  • Domain: Eukaryota
  •   Kingdom: Plantae
  •     Phylum: Spermatophyta
  •       Subphylum: Angiospermae
  •         Class: Monocotyledonae
  • Summary of Invasiveness
  • The following summary is from Witt and Luke (2017):

    Description

    A long-lived or evergreen onion-like plant with uprig...

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    Compendia
    CAB International
    Wallingford
    Oxfordshire
    OX10 8DE
    UK
    compend@cabi.org
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Identity

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Preferred Scientific Name

  • Allium neapolitanum Cirillo

Preferred Common Name

  • False onion weed

Summary of Invasiveness

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The following summary is from Witt and Luke (2017):

Description

A long-lived or evergreen onion-like plant with upright stems [15–60 (–100) cm tall]; underground bulbs white, egg-shaped (15–25 mm long).

Origin

Argentina, Brazil, Chile, Costa Rica, Guatemala, Honduras, Mexico, Panama, Paraguay, Peru and Uruguay.

Reason for Introduction

Ornament and accidentally as a contaminant.

Invades

Roadsides, disturbed areas, wastelands, urban open spaces, gardens, croplands, plantations, wetlands and riversides.

Impacts

Forms dense stands, to the possible detriment of native flora and fauna. In temperate regions of Australia, it is considered to be an environmental weed in coastal districts, and has been recorded in many conservation areas. Regarded as an agricultural weed in parts of the USA, it often dominates in croplands (Fragman-Sapir, 2003). When harvested with crops A. neapolitanum often imparts
an undesirable garlic or onion flavour to contaminated food products, reducing quality and often resulting in produce being rejected for sale or export (CDFA, 2009).

Taxonomic Tree

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  • Domain: Eukaryota
  •     Kingdom: Plantae
  •         Phylum: Spermatophyta
  •             Subphylum: Angiospermae
  •                 Class: Monocotyledonae
  •                     Order: Liliales
  •                         Family: Liliaceae
  •                             Genus: Allium
  •                                 Species: Allium neapolitanum

Distribution Table

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The distribution in this summary table is based on all the information available. When several references are cited, they may give conflicting information on the status. Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report.

Last updated: 25 Feb 2021
Continent/Country/Region Distribution Last Reported Origin First Reported Invasive Reference Notes

Africa

KenyaPresentIntroducedInvasive
UgandaPresentIntroduced

Europe

GreecePresent

North America

Costa RicaPresent
GuatemalaPresent
HondurasPresent
MexicoPresent
PanamaPresent

South America

ArgentinaPresent
BrazilPresent
ChilePresent
ParaguayPresent
PeruPresent
UruguayPresent

Habitat List

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CategorySub-CategoryHabitatPresenceStatus
Terrestrial

Links to Websites

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WebsiteURLComment
GISD/IASPMR: Invasive Alien Species Pathway Management Resource and DAISIE European Invasive Alien Species Gatewayhttps://doi.org/10.5061/dryad.m93f6Data source for updated system data added to species habitat list.

Distribution Maps

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