The following Participating Institutions are custodians for this species in the CPC National Collection:
The Morton Arboretum
Botanical Research Institute of Texas
The conservation of Scirpus hallii is fully sponsored.
Andrea Tietmeyer contributed to this Plant Profile.
Scirpus hallii, a delicate annual sedge, is a very specialized plant with a narrow habitat tolerance. It is generally found on bare, moist sandy shores of ponds where the water levels fluctuate. It is believed that the changes in water level favor the germination of the plant's seed and also act as a barrier to competition from other plants that cannot survive such changes.
Distribution & Occurrence
Scirpus hallii occurs on sandy substrates such as the sandy borders of ponds or lakeshores. The fluctuating water table in these habitats maintain favorable conditions for the persistence of this and other similar species (Bowles 1990). Seeds germinate in areas around the pond where the soil is moist and exposed, with little competition from perennials.
Scirpus hallii is, however, associated with several other plant species: Agrotis spp., Alisma spp., Ammania coccinea, Bacopa spp., Cyperus spp., Echinochloa spp., Eleocharis spp., Fimbristylis autumnalis (L) Roemer & Schultes,., Heterantha spp., Hypericum spp., Isoetes spp., Juncus, Leersia, Lindernia spp., Liporcarphs micrantha, Ludwigia spp., Lycopus spp.; Polygonum spp., Rhexia spp., Rhynchospora spp., Rorippa spp., Rotala ramosior (l.) Koehne, Sagittaria spp., Schoenoplectus spp., scirpus spp., Typha spp., and Xyris. Of these species, Echinodorus tenellus (parvulus) is endangered in the Midwestern States and is of special concern to the U.S. Fish and Wildlife.
|Two colonies form a population at the Indiana Dunes National Lakeshore (Bowles 1990). Twenty seven populations in Illinois (Robertson and Phillipe 1993). Two Populations in Michigan (Robertson and Phillipe 1993). Three populations in Missouri (Robertson and Phillipe 1994). According to McKenzie (1998) populations have been found in Alexander, Cass, Kankakee, Mason and Morgan Counties of Illinois; Porter County, Indiana; Reno County, Kansas; Christian County, Kentucky; Howell and Scott Counties in Missouri and Dane County, Wisconsin since 1993.|
Conservation, Ecology & Research
Wetland destruction and alteration
Predation from mute swans and Canadian Geese
Most (87%) of populations are on private land and are not protected (McKenzie 1998).
Steyermark, J.A. 1977. Flora of Missouri. Ames, IA: Iowa State University Press. 1728p.
Swink, F.; Wilhelm, G. 1994. Plants of the Chicago Region. Lisle, Illinois: The Morton Arboretum. 922p.
Weber, W.A. 1984. New names and combinations, principally in the Rocky Mountain flora--IV. Phytologia. 55: 1-11.