Cardaria spp.

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Legend for Species Pages

Hoary Cress, Cress, Whitetop

Cardaria spp.

  • ANPC Rank –
  • Moss, Flora of Alberta – Common
  • Global Invasive Species Database – No
  • NatureServe Rank – Not yet assessed
  • Haber, Upland – No
  • Haber, Wetland – No
  • CWF, Status & Invasive Range – No
  • Alberta Revegetation Guidelines – No
  • The Nature Conservancy – Yes, w/ ESA
  • CBCN – No
  • AB Weed – Noxious


Whitetop or Hoary cress describes several species that come with a confusing array of common names and latin synonyms including:

  • globe-podded hoary cressLepidium appelianum Al-Shehbaz
  • heart-podded hoary cressLepidium draba L.
  • lens-podded hoary cressLepidium chalepense L.
  • Hairy Whitetop - Cardaria pubescens (C.A. Meyer) Jarmolenko, and
  • Lenspod Whitetop - Cardaria chalepensis (L.) Hand-Maz.,

According to the USDA Plants Database[1], [2],

all of these species occur in AB.

All of them are considered "noxious" (hoary cress - Lepidium) under the Weed Control Act Regulation[3].

Not especially competitive in established communities, but can spread underground like Creeping Thistle and be very persistent.

Cutting or herbicide are most effective when plants are in full flower, and relatively ineffective prior to that stage.

[4] Link to USDA Plants Profile for Cardaria Desv. whitetop


Cardaria draba from Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. Vol. 2: 165.
Cardaria chalapensis, photo from XID Services
Cardaria chalapensis, photo from XID Services
Cardaria chalapensis, Photo from XID Services
Cardaria draba
Cardaria draba
Cardaria draba
Cardaria draba, photo from XID Services
Cardaria pubescens, photo from XID Services
Cardaria pubescens, photo from XID Services


Lyons, Kelly E., "ELEMENT STEWARDSHIP ABSTRACT for Cardaria draba (L.) Desv., Heart-podded hoary cress, Cardaria chalepensis (L.) Hand-Maz., Lens-podded hoary cress, and Cardaria pubescens (C.A. Meyer) Jarmolenko. Globe-podded hoary cress", UC Davis and The Nature Conservancy. [5].

Map references

sample: Map data for T. ramosissima