Robert W. Freckmann Herbarium


Because of technology changes and personnel changes at UWSP and the Wisconsin State Herbarium, the database of plant species housed at this site was merged with the database from the OLD WisFlora website to create a new Flora of Wisconsin website at Currently we are encouraging all Wisplant viewers to begin using the Flora of Wisconsin website as soon as possible. Wisplants will remain operational through July 13th. After that date, all traffic to Wisplants will be redirected to the Flora of Wisconsin website.

Please direct any comments to

Thank you.

  Acorus calamus L. image
Photographer: Damon A. Smith           

Botanical Illustration

Damon A. Smith

Kurt Stüber

Matthew L. Wagner

Matthew L. Wagner

Marion Sheehan
Family Acoraceae
Acorus calamus L.
Acorus: the Latin akoron was the Greek name of an iris
calamus: from Greek mythological figure Kalamos, the son of Maiandros (aka Meander), god of the Meander River.
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Introduced - naturalized
Plant: erect, perennial, emergent semi-aquatic up to 6' tall; sweet spicy smell when crushed; very long, aromatic rhizomes
Flower: yellow to brown, tiny, 6-parted; inflorescence a 2"-4" dense, thick, pointed spadix protruding from the side of leaf-like spathe; blooms June-July
Fruit:brown berry, dry on the outside
Leaf:sweetly aromatic, crowded at the base, long, narrow, sword-like, only midvein prominently raised, 1 wavy margin
Habitat: shallows, ponds, marshes, in water less than 20" deep; in sediment soil

More Information Natural Communities Herbarium Specimens
All Acorus list Ethnobotany Information Google- Images or Text

Flora of North America (off site)
Acorus americanus auct. non (Raf.) Raf.
Acorus calamus L. var. americanus auct. non (Raf.) Raf.

Botany News/Events
Book We Recommend
Historical Botanists
Other Links
Botanical Club of Wisconsin (off site)
UW-Stevens Point Biology Dept.
Plants of Wisconsin
Vascular Plants
Natural Communities
Botany News/Events
Other Links
Lichens (off site)   
Tom Volk's Fungi (off site)
Taxonomy of Vascular Plants
                          Vascular Plants
Browse by Identification Guides
Family Wildflowers
Genus Trees
Common Names Shrubs
Search by Vines
Names Aquatic-Semi aquatic
Specimens Ferns - Fern Allies
Blooming Times Grasses, Sedges, or Rushes
County & Status Other Resources  
Town Range Taxonomy of Vascular Plants
  WI Checklist & CofC Values
Browse by:
Common Name
Search by:
Copyright © 2012 Permissions Contact Us Web Map