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Submit Vouchered Specimens to the Wisconsin State Herbarium

Submit Vouchered Specimens to the Wisconsin State Herbarium!

A herbarium voucher, a physical pressed specimen, provides verifiable and permanent records of species’ occurrences through time and space. Herbarium records are essential for management and biological research. Vouchers are used for tracking historical distributions, understanding modes of dispersal, studying climate change, and are essential for accurate identification and nomenclature.

Although many invasive species are reported in counties across the state, associated herbarium records are often lacking. To see if a specimen has already been collected in your county, visit the Flora of Wisconsin database. The Herbarium is seeking pressed voucher specimens of certain invasive plants in certain parts of the state. Visit this page to see the list of species and locations!

Although a properly prepared specimen by use of a plant press is best, creating a vouchered specimen can also be as simple as pressing gathered plant materials between a sheet of newspaper inside a heavy book, such as a phone book. The key is to make sure the material dries out quickly. Be sure to collect flowers and/or fruits along with vegetative material. Details on how to create a vouchered specimen are here.

Please be sure to submit the following information with your pressed specimen:

  • date of collection, name of collector
  • detailed geographical data (lat/long coordinates and a description of specific locality, private or public land)
  • ecological data (habitat, co-occurring species)
  • size of population, are plants in flower or fruit?

Please send specimens to:
Wisconsin State Herbarium
Department of Botany, 160 Birge Hall
430 Lincoln Drive
Madison, WI 53706

You are donating to : The Invasive Plants Association of Wisconsin, a non-profit organization, making your donation tax deductible.

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