Trollius laxus ssp. laxus
|American globe-flower, spreading globe-flower|
|Fisch. & C.A. Mey.|
|Dawn M. Gerlica and Lindsey Parsons|
The following Participating Institutions are custodians for this species in the CPC National Collection:
The Holden Arboretum
Cornell Botanic Gardens
The conservation of Trollius laxus ssp. laxus is fully sponsored.
Dawn M. Gerlica and Lindsey Parsons contributed to this Plant Profile.
To date, this species is found in approximately 40 populations, most of them with fewer than 100 individuals, in eastern North America. Conservation activities for this species are numerous in its range, and include monitoring, seed banking (three occurrences), ecology and population genetics work, and propagation. Because of this work, the taxon was recently elevated to the full species level, and work has shown that this species is the only polyploid member of its genus. (Jones 2001)
Trollius laxus is a perennial that grows to 12-20 inches tall. It has 1 to 1 1/2 inch diameter pale yellow or cream colored flowers. Each flower has 15-25 petals, and it blooms from April to June. The leaves of this species are palmately cut, lobed leaves that are 3-5 inches wide. After blooming, the leaves increase dramatically in size. (TNC 1987)
Distribution & Occurrence
- New Jersey
- New York
This perennial grows in wetlands influenced by cold, highly alkaline groundwater seepage found in open fens, along swamp margins, and in partly sunny, wet openings in seepage swamps. It also lives in wet woods, wet meadows, and other calcareous wetlands. It doesn't adapt well to habitat alterations. This species is able to survive competition from other plants in deep shade, but needs sunlight to flower and produce seed. It prefers soils derived from glacial materials, such as clays, silt, sand, and gravelly soils. It occupies areas prone to flooding and ponding, as well as areas with low or slow soil permeability. (TNC 1987)
|Jones (2001) states that there are approximately 40 known occurrences of this species, all in eastern North America. Most of these occurrences have less than 100 individuals, and almost all have less than 1000 individuals.|
Conservation, Ecology & Research
Seeds ripen by mid-June (in Connecticut), with gravity, wind, rain and seasonal winds dispersing them. (Parsons and Yates 1984)
Natural succession of wetlands to woody vegetation
Changes in the watershed by humans, beavers, or other sources
Under the theory that removal of woody species shading the Trollius population would increase flowering, a section of one population was cleared in 1999. The cleared portion did not show the expected increase in number of plants or flowering plants by 2001, but further monitoring may be necessary (Faivre 2002)
Searches of appropriate habitat for historic and potentially new occurrences.
Strive to achieve and maintain full genetic representation in the seed bank from known and new occurrences if they are found.
Protect at least one site (with the larges known population) in Connecticut.
Study the biology of the species in situ, including competition interactions and pollination biology, to help guide management strategies.
Determine hydrologic processes that influence the vegetation composition and structure of wetlands that support this species.
Continue work to clarify the full taxonomy of this species and members of the Trollius genus in North America.
Anderson, J.L. 1988. Status report for Lesquerella pruinosa. Golden, CO. U.S. Fish and Wildlife Service. Unpublished report.
Crow, G.E. 1982. New England's rare, threatened, and endangered plants. Washington, D.C.: U.S. Government Printing Office. 169p.
House, H.D. 1924. Annotated list of the ferns and flowering plants of New York State: New York State Museum Bulletin No. 254. Albany: The University of the State of New York. 332p.
O'Kane, S.L. 1988. Colorado's rare flora. Great Basin Naturalist. 48, 4: 434-484.