Equisetum palustre L.
Equisetum palustre L. var. americanum Victorin
Equisetum palustre L. var. simplicissimum A. Braun
Marsh horsetails are smaller and more delicate looking than most other horsetails.
Identification: Plants are usually less than 24" (60 cm) tall. Branches are so thin that they appear soft and needle-like. In some cases the branches are sparse or not present at all. Cones are about 1" (2.5 cm) long. See Equisetum for a comparison chart.
Equisetum palustre in The Equisetum Species (Horsetails) of the British Isles
Equisetum palustre on Earl J.S. Rook's Flora, Fauna, Earth, and Sky ... The Natural History of the Northwoods
Equisetum palustre on CalPhotos
Equisetum palustre at the Lady Bird Johnson Wildflower Center
Equisetum palustre at the Central Yukon Species Inventory Project
Equisetum palustre on Wikipedia
Equisetum palustre at the University of Wisconsin-Green Bay Cofrin Center for Biodiversity
Equisetum palustre on Plants for a Future, a resource and information centre for edible and otherwise useful plants
Equisetum palustre on eFloras
Cobb, Boughton, Farnsworth, Elizabeth & Lowe, Cheryl, Peterson Field Guides: A Field Guide to Ferns and Their Related Families of Northwestern and Central North America, Houghton Mifflin Company, 2005, p. 348.
Equisetum palustre description by Thomas H. Kent, last updated 12 Oct 2018.