Arrow-leaved Sweet-coltsfoot (Petasites sagittatus)

Overview

Species Overview

Arrow-leaved Sweet-coltsfoot (Petasites sagittatus), a State Threatened plant, is found in cold marshes and swamp openings, often forming large clones. This species hybridizes with Petasites palmatus. Blooming occurs throughout May; fruiting occurs throughout June. The optimal identification period for this species is late May through late August.

Status and NHI Documented Occurrences in Wisconsin

The table below provides information about the protected status (State and Federal Status) and the rank (S and G Ranks) for Arrow-leaved Sweet-coltsfoot (Petasites sagittatus). See the Working List Key for more information about the abbreviations used. Counties shaded blue have documented occurrences for this species in the Wisconsin Natural Heritage Inventory database. For invertebrates, dots depict locations from the "Invertebrate Atlas," a database with occurrences of rare and common aquatic and select terrestrial invertebrate species found in Wisconsin and adjacent areas. While the invertebrate atlas is a quality assured database, not all records have been verified. The map is provided as a general reference of where this species has been found to date and is not meant as a range map.

Summary Information
State Status:	THR
Federal Status in Wisconsin:	none
State Rank:	S3
Global Rank:	G5
Tracked by NHI:	Y
Species of Greatest Conservation Need:	n/a

Documented locations of Petasites sagittatus in the Natural Heritage Inventory Database as of April 2009.

Detailed Information

Synonyms: Petasites dentatus, Tussilago sagittata

Habitat Information

Habitat Description: Found in cold marshes and swamp openings, often forming large clones. This species hybridizes with Petasites palmatus.
Soils: Wet soils.
Curtis Type(s): Alder thicket, boreal forest,

Phenological Information

Blooming Phenology: throughout May
Fruiting Phenology: throughout June
Optimum Time to Identify: late May through late August

Other

Vegetative Reproduction: Rhizomatous
Life Cycle: Perennial
Comments: Associated Species: Calamagrostis canadensis, Salix petiolaris, Alnus rugosa, Cornus stolonifera, Carex stricta, Sparganium glomeratum.

Additional Resources

Gleason & Cronquist page(s): p. 561
Britton & Brown (Volume & page): 3:407
Peterson Flower Guide page(s): None
Newcomb's Guide page(s): None

1. Guides Referenced:
Farnsworth, E., B. Cobb, & C. Lowe. 2005. Peterson Field Guide to Ferns, Second Edition: Northeastern and Central North America. Houghton Mifflin Harcourt. 440 pp

Flora of North America Editorial Committee (Editor). 1993. Flora of North America: North of Mexico Volume 2: Pteridophytes and Gymnosperms. Oxford University Press. 496 pp.

Gleason, H.A. 1952. The new Britton and Brown Illustrated Flora of the Northeastern United States and Adjacent Canada. 3 volumes. The New York Botanical Garden.

Gleason, Henry A. and Arthur Cronquist 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. New York Botanical Garden. Bronx, New York.

Lellinger, D.B. 1985. A Field Manual of the Ferns and Fern-Allies of the United States & Canada. Smithsonian Institution Press. 389 pp.

Newcomb, L. 1989. Newcomb's Wildflower Guide. Little, Brown and Company. 490 pp.

Peterson, Roger Tory and Margaret McKenny. 1968. A Field Guide to Wildflowers of Northeastern and Northcentral North America. Houghton Mifflin Company, Boston. 420 pp.

Voss, Edward G.1972. Michigan Flora. Cranbrook Institute of Science (Vols I, II, and III)

Photos

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