In New York the flowers have never been photographed in the wild.
There are only three existing populations in the state. There are 20 historical occurrences,` and many of these have not been searched in detail, so it is expected that a few more populations could be found. Some historical records are probably extirpated by changes in hydrology or development of wetlands.
Populations seem stable as they occur in protected areas, even though their numbers are low.
This species was never common in the state but only three populations are known from the 20 historical records from the late 1800s and 1900s. Some of these may be rediscovered but changes in hydrology and development patterns have probably reduced overall numbers.
Potential threats could be any changes in hydrology that flood or permanently dry up the wetland habitat.
Establish sufficient buffers around populations to preserve the undisturbed aspect and hydrology of their habitat.
It is not known whether this plant has recently been seen in flower in New York and if not, why not. Research could be done to determine if it is possible to expand existing populations.
In New York this species has been found growing at the edges of forested, calcareous, northern swamps, or in wetter, open sites within upland forests. More information on the habitat preferences of this species in New York is needed (New York Natural Heritage Program 2007). Low moist woods, coniferous and mixed, including cedar and tamarack swamps and some rocky sites; seems to bloom best along trails and after clearing (Voss 1996). Meadows, swampy places and moist woods (Gleason and Cronquist 1991). Low woods, glades and damp clearings (Fernald 1970).
Sweet Coltsfoot is found at scattered locations from Albany to the northern and western parts of the state.
Sweet Coltsfoot is found in all the Canadian Provinces, all the New England states, and west across the northernmost tier of the U.S., excepting Montana, and from Washington State south into California.
Sweet Coltsfoot is a perennial herb of the aster family. It grows up to 50 cm high. The basal leaves are round to heart or kidney-shaped overall, green and glabrous above, and covered with white hairs underneath. They are palmately lobed, the sinuses (gaps) between the (5 to 11) lobes extending more than halfway to the base of the leaf. These lobes in turn may be toothed, or cleft into lobes. The flowers appear from basal stems in early spring, before the leaves, in roughly ball-shaped infloresences (corymb, or raceme). They are borne on pedicels 3-10 cm long, and are creamy white, the ray (petal-like) flowers only 2-7 mm long. However, in New York State this species apparently does not usually flower.
Although having both flowers or fruit and leaves is ideal for identification, this species rarely flowers in New York, and populations have been identified based on the leaves only.
Petasites frigidus var. palmatus is the only variety of Petasites frigidus in New York. (Petasites frigidus is now considered to be the only species in North America). The flowers may be confused with two non-native, weedy species: Petasites hybridus, and Tussilago farfara. Petasites hybridus has purple, rayless flowers with short pedicels, and simple leaves, and the petioles have dilated sheathing bases. It also tends to grow in more disturbed and waste places. Tussilago farfara (confusingly, also commonly called "coltsfoot") has entirely yellow flowers and simple leaves.
Vegetative Sweet Coltsfoot plants could be confused with Goldenseal or May-Apple, but these species have leaves which are borne on branching stems, rather than basal. The leaves may also be confused with Canada waterleaf, Hydrophyllum canadense but on the underside, the secondary veins are slightly pinnate from the primary veins and green on the undersides while sweet coltsfoot has the primary and secondary veins arising from the same point at the base. Sweet coltsfoot leaves are also whitish on the undersides.
This species flowers in April or May, before the emergence of the leaves. The leaves may persist until July.
The time of year you would expect to find Sweet Coltsfoot flowering and fruiting in New York.
Petasites frigidus var. palmatus (Ait.) Cronq.
Flora of North America Editorial Committee. 2006. Flora of North America North of Mexico. Vol. 20. Magnoliophyta: Asteridae, Part 7: Asteraceae, part 2. Oxford Univ. Press, New York. xxii + 666 pp.
Fernald, M.L. 1950. Gray's manual of botany. 8th edition. D. Van Nostrand, New York. 1632 pp.
Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. The New York Botanical Garden, Bronx, New York. 910 pp.
Holmgren, Noel. 1998. The Illustrated Companion to Gleason and Cronquist's Manual. Illustrations of the Vascular Plants of Northeastern United States and Adjacent Canada. The New York Botanical Garden, Bronx, New York.
New York Natural Heritage Program. 2010. Biotics database. New York Natural Heritage Program. New York State Department of Environmental Conservation. Albany, NY.
New York Natural Heritage Program. 2020. New York Natural Heritage Program Databases. Albany, NY.
Newcomb, Lawrence. 1977. Newcomb's Wildflower Guide: An Ingenious New Key System for Quick, Positive Field Identification of the Wildflowers, Flowering Shrubs, and Vines of Northeastern and North-Central North America. Little, Brown and Company. Boston.
Voss, Edward G. 1996. Michigan Flora Part III. Dicots Concluded (Pyrolaceae - Compositae). Cranbrook Institute of Science Bulletin 61 and University of Michigan Herbarium. 622 pp.
Weldy, T. and D. Werier. 2010. New York flora atlas. [S.M. Landry, K.N. Campbell, and L.D. Mabe (original application development), Florida Center for Community Design and Research http://www.fccdr.usf.edu/. University of South Florida http://www.usf.edu/]. New York Flora Association http://newyork.plantatlas.usf.edu/, Albany, New York
Weldy, Troy W. and David Werier. 2005. New York Flora Atlas. [S.M. Landry, K.N. Campbell, and L.D. Mabe (original application development), Florida Center for Community Design and Research. University of South Florida]. New York Flora Association, Albany, NY. Available on the web at (http://newyork.plantatlas.usf.edu/).
Information for this guide was last updated on: May 12, 2019
Please cite this page as:
New York Natural Heritage Program. 2020. Online Conservation Guide for Petasites frigidus var. palmatus. Available from: https://guides.nynhp.org/sweet-coltsfoot/. Accessed March 30, 2020.