Sedum integrifolium ssp. leedyi
|doseroot, leedy's roseroot, Leedy's stonecrop|
|(Rosendahl & Moore) Clausen|
The following Participating Institutions are custodians for this species in the CPC National Collection:
The Holden Arboretum
The conservation of Sedum integrifolium ssp. leedyi is fully sponsored.
Lindsey Parsons contributed to this Plant Profile.
This subspecies is a glacial relic of the Pleistocene that was widespread at the end of the last glaciation but has become extremely rare in the warmer temperatures of post-glaciation climates. Unfortunately, human activities have exacerbated this decline by disturbing the remaining habitat where this subspecies can still survive. Today it is found in a very unique system that experiences much cooler temperatures than surrounding areas due to cool air that rises through cracks from subterranean caves. This air is thought to create small areas where the temperature more closely resembles that of the Pleistocene Era. These small systems are extremely vulnerable to dumping in sinkholes, clearcutting of upland trees, and anything that alters the water quality and hydrology including development and the use of chemical herbicides and pesticides. As relics, this subspecies is a living fossil that can provide us with a tremendous amount of information about the organisms that lived during the Pleistocene. If we lose this plant, we lose a vital clue to our own history as well as the history of the earth. Perennial plant with waxy leaves. Can tolerate period of water stress. Elongated leafy stem that can become limp in dry weather. Closely packed leaves arise from main stem. Leaves are irregularly toothed and sometimes not toothed at all. Male and female flowers born on separate plants. Flowers have 4-5 petals, and dense heads of flowers at the and of leafy stems. Blooms are dark red, and can be yellow or orange.
Distribution & Occurrence
- New York
Likes cool cliffs. Lives on 'moderate' cliffs, which are cliffs where there are cracks in the rock that go to underground caves, so cold air can come up under the plant. Occasionally the underground caves connect aboveground and uphill from sinkholes. Generally lives on cool water-fed limestone cliffs. Lives on talus slopes or cliffs in which ground water maintains a cool, wet environment throughout the summer. (Sather 1996; USFWS 1992)
|There are two sites in upstate New York as described above. Watkins Glen only has one individual present although it is in good condition. Four populations are found in Minnesota with each containing several thousand plants. (USFWS 1992) Only the populations at Watkins Lake and Whitewater Wildlife Management Area, Minnesota are located on public land.|
Conservation, Ecology & Research
Lakeside residential development and concurrent tree clearing
Ground water contamination
Olfelt, J.P. 1998. Population Biology of Sedum integrifolium ssp. leedyi. Dissertation Abstracts International. 59-07, Section B: 3172.
Olfelt, J.P.; Furnier, G.R.; Luby, J.J. 1998. Reproduction and development of the endangered Sedum integrifolium ssp. leedyi (Crassulaceae). American Journal of Botany. 85, 3: 346-351.
Olfelt, J.P.; Furnier, G.R.; Luby, J.J. 2001. What data determine whether a plant taxon is distinct enough to merit legal protection A case study of Sedum integrifolium (Crassulaceae). American Journal of Botany. 88, 3: 401-410.
USFWS. 1992. Determination of Threatened Status for Sedum integrifolium ssp. leedyi (Leedy's roseroot). Federal Register. 57, 78: 14649-14653.
Vetter M.A. 1981. The Physiological Ecology of Sedum lanceolatum in the Colorado Front Range. Dissertation Abstracts International. 43-02, Section B: 0334.