There are 8 extant occurrences and about 40 historical occurrences yet to be checked, probably not uncommon.
In New York purple cress has been found in a variety sites, generally with moist to wet, rich soils. These include wet places within upland deciduous forests, steambeds, alluvial woods and fields, swampy pastures, springs, and calcareous swamps (New York Natural Heritage Program 2010). Rich woods, bluffs, mesic bottomland forests, rocky hillsides, floodplains, seepage of bogs, springy areas (FNA 2010). Low rich deciduous woods, floodplains (Voss 1985).
Throughout the state.
Flowering individuals are best for identification.
Flowering shoots appear in late April, and the fruits appear in early May. By July the fruiting stalks may start to disappear.
The time of year you would expect to find Purple Cress flowering and fruiting in New York.
Cardamine douglassii Britt.
The authority for this species is sometimes cited as "Torrey, in Torrey & A. Gray (1838)" however, Arabis douglassii was listed by Torrey as a synonym only.
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. 2019. New York Natural Heritage Program Databases. Albany, NY.
Voss, E.G. 1985. Michigan flora. Part II. Dicotyledons. Cranbrook Institute of Science and University of Michigan Herbarium. Ann Arbor, Michigan. 1212 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
Information for this guide was last updated on: August 9, 2011
Please cite this page as:
New York Natural Heritage Program. 2019. Online Conservation Guide for Cardamine douglassii. Available from: https://guides.nynhp.org/purple-cress/. Accessed March 19, 2019.