Posts tagged with pest

WEED ALERT – watch for horsetails!

  • Distribution of Equisetum arvense in New Zealand as indicated by verifiable specimens in Te Papa’s herbarium. Te Papa’s collection is an under-representation of this species’ full extent, having been recorded by others from Auckland, Napier, New Plymouth, Christchurch, and Dunedin.
  • Equisetum arvense is much smaller (up to 80 cm tall, but often much shorter) and is branched, whereas Equisetum hyemale is unbranched. Photo by Jean-Claude Stahl, Natural Environment Imager. Copyright Museum of New Zealand Te Papa Tongarewa.
  • Stems of Equisetum hyemale, with the terminal ‘cones’ that produce spores. Photo by Clayson Howell, DOC. Copyright Clayson Howell, Wellington.
  • An unimpressed Jon Terry (DOC) with the Levin infestation of Equisetum hyemale. Photo by Clayson Howell, DOC. Copyright Clayson Howell, Wellington.

An infestation of a giant horsetail, Equisetum hyemale, has been found near Levin. It was spotted by eagle-eyed Department of Conservation staff. They gave us a specimen for Te Papa’s herbarium collection of dried plants.   No horsetail species occur naturally in New Zealand, but several have been purposefully or accidentally introduced. Because they are… Read more »