Posts tagged with horsetail

Botany Fieldtrip Wairarapa 2010: Day 4

Horsetail, Equisetum arvense. Photo by Jean-Claude Stahl. © Te Papa.

Our final collecting day. We packed up and began heading from home. We spent about an hour alongside the road in the gorge of the Owahanga River. Peter was pleased to add several new mosses, including some that have a liking for calcareous substrates. We were disappointed to find the invasive horsetail Equisetum arvense well… Read more »

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 »