Leedy's roseroot was first collected at Watkins Glen collected in 1918 by L. F. Randolph, a botanist from Cornell University. He didn't say how many plants he saw there but he described its location as the same place where only one plant was rediscovered in 1991. That population was destroyed by trail construction in 2017. There may be potential for reintroduction of this species in appropriate habitat at Watkins Glen or nearby.
There are now two existing populations, of which is very large, and one extirpated site. There are no other known historical populations.
The two known extant populations appear to be fairly stable with no large fluctuations in numbers.
Two of the three populations have been known since the early 1800s and early 1900s. A third population was discovered in 1994, and one was extirpated in 2017.
One small population is threatened by the encroachment of woody vegetation. The large population is threatened by a growing swallowwort population and a large infestation of Japanese knotweed.
Remove swallow-wort from areas near the populations and study the effect of knotweed on its growth and reproduction. Prevent new construction of docks and stairways that would cover existing plants.
Research is being performed on the effect of Japanese knotweed on the population at Seneca Lake. More research is needed on the spread of swallowwort into the population.
In New York Leedy's Roseroot is known only from mesic or seepy sandstone, siltstone and shale cliffs of circumenutral pH (New York Natural Heritage Program 2013). Cool seeps in rocks (FNA 2010). Calcareous cliffs (Fernald 1970).
In New York Leedy's Roseroot is limited to cliff faces near the southern portion of Seneca Lake and the immediate vicinity.
This subspecies is known only from two counties each in southeastern Minnesota and central New York.
Rhodiola integrifolia ssp. leedyi is a distinctive-looking, moderately-sized, succulent, native perennial plant that reaches up to 45 cm tall. Its leaves are blue-green and narrowly lanceolate with their tapered end at the base (oblanceolate), and 3 to 5.5 cm long by 0.5 to 1.5 cm wide. The flowering stems appear annually with male and female flowers on separate plants (dioecious). The inflorescences are dense, flat-topped clusters up to 8 cm across, with up to 250 flowers, with those borne on the main axis and branch ends opening first. The petals are elliptic-oblong, dark red throughout or usually greenish yellow at their base, and 1.5 to 5mm long. They are erect in pistillate flowers, and spreading and hooded in staminate flowers. The seeds are winged, pear-shaped or lanceolate, have spreading beaks, and are borne in 4 to 9 mm dry pods (FNA 2010).
Rhodiola integrifolia ssp. leedyi is a distinctive looking, moderately sized, succulent, native perennial plant that reaches up to 45 cm tall. Its leaves are blue-green and narrowly lanceolate with their tapered end at the base (oblanceolate), and 3 to 5.5 cm long by 0.5 to 1.5 cm wide. The flowering stems appear annually with male and female flowers on separate plants (dioecious). The inflorescences are dense, flat-topped clusters up to 8 cm across, with up to 250 flowers, with those borne on the main axis and branch ends opening first (corymbose cyme). The petals are elliptic-oblong, dark red throughout or usually greenish yellow at their base and 1.5 to 5mm long. They are erect in pistillate flowers, and spreading and hooded in staminate flowers. The seeds are winged, pear-shaped or lanceolate with the tapered end at the base and spreading beaks, and are borne in 4 to 9 mm dry pods (FNA 2010).
Do not collect this species for identification puposes. For positive identification the whole Plants with leaves, flowering stem and intact mature flowers should be observed. In addition, a description of the habitat and location should be made, and a picture of the plant should be taken.
Rhodiola rosea (sensu stricto) has narrow petals (about 1 mm or less) that are usually yellow or yellowish, but are sometimes red towards the tip, and pale green, usually glacuous leaf baldes. In contrast Rhodiola integrifolia ssp. leedyi's petals are 1 to 1.8 mm wide, dark red throughout or greenish yellow at their bases. Rhodiola rosea is also restricted to the Catskills, Hudson Valley, and Adirondacks, while R intergrifolia ssp. leedyi occurs only in central New York. There are also escaped cultivars of Rhodiola and Sedum which may invade rocky habitats near settlement. The common escaped Sedum species can be distinguished by their yellow to golden yellow flowers and bright green leaves.
Flowers mid-May through August, fruits may persist through the summer into frost.
The time of year you would expect to find Leedy's Roseroot vegetative, flowering, and fruiting in New York.
Rhodiola integrifolia ssp. leedyi (Rosendahl & Moore) Kartesz
The taxonomy of this plant may be questioned. It is currently aligned with Rhodiola integrifolia ssp. leedyi, a very rare and local plant known from southeastern Minnesota. There is a strong possibility that our plants are something different, but undescribed. Many authors have lumped this under Rhodiola rosea or placed it as a variety of Rhodiola rosea.
Flora of North America Editorial Committee. 2010. Flora of North America North of Mexico. Vol. 08. Magnoliophyta: Paeoniaceae to Ericaceae. Oxford Univ. Press, New York. xxiv + 585 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.
Mitchell, Richard S. and Gordon C. Tucker. 1997. Revised Checklist of New York State Plants. Contributions to a Flora of New York State. Checklist IV. Bulletin No. 490. New York State Museum. Albany, NY. 400 pp.
New York Natural Heritage Program. 2023. New York Natural Heritage Program Databases. Albany, NY.
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
Zaremba, Robert E. 1991. Corrections to phenology list of April 9, 1991.
This guide was authored by: Stephen M. Young, Elizabeth Spencer, Richard M. Ring.
Information for this guide was last updated on: August 6, 2020
Please cite this page as:
New York Natural Heritage Program. 2023. Online Conservation Guide for Rhodiola integrifolia ssp. leedyi. Available from: https://guides.nynhp.org/leedys-roseroot/. Accessed May 29, 2023.