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Schwegman, J.E. The vascular flora of Langham Island, Kankakee County, Illinois. Pp. 1-8.
Schwegman, J.E. New records for Illinois vascular plants. Pp. 9-12.
Abstract:Lysimachia X producta (Gray) Fern., Mirabilis hirsuta (Pursh) MacM., Carex heliophila Mack., and the hybrid Lespedeza leptostachya Engelm. X L. capitata Michx. are reported as natives of Illinois for the first time. Significant distributional records for 21 additional taxa are also reported.
Young, D. Illinois' native snowberry. Pp. 13-15.
Konsis, K. and D. Westfall. Forest Glen's savanna project. Pp. 16-17.
Landes, J.M. and J.E. Ebinger. Woody understory of Baber Woods, Edgar County, Illinois. Pp. 18-21.
Abstract:The woody understory of Baber Woods Nature Preserve, Edgar County, Illinois, was surveyed in closed and open canopy areas. Data were analyzed for age/height relationships, and the density, frequency, relative density, relative frequency, and importance value were determined for each species. Under the closed canopy seedlings and saplings of slippery elm and sugar maple account for an importance value of 153.7 (out of 200) and a total of 8,478 stems/ha. In open canopy situation these same species dominated, accounting for an importance value of 188.6 with 6,900 stems/ha. If this trend continues, Baber Woods will soon become a sugar maple dominated forest.
Newell, S.A., L.L. Horton, and J.E. Ebinger. Vegetation of Wolf Creek State Park, Shelby County, Illinois. Pp. 22-26.
Abstract:The woody overstory of four forest types was surveyed at Wolf Creek State Park, Shelby County, Illinois. These included: a successional upland forest (592 stems/ha and a basal area of 15.41 m2/ha), an immature second growth upland forest (426 stems/ha and a basal area of 22.21 m2/ha), a mature second growth upland forest (292 stems/ha and a basal area of 26.39 m2/ha), and a mature second growth ravine forest (362 stems/ha and a basal area of 23.29 m2/ha).
Bowles, M.L., J.B. Taft, E.F. Ulaszek, M.K. Solecki, D.M. Ketzner, L.R. Phillippe, A. Dennis, P.J. Burton, and K.R. Robertson. Pp. 27-51.
Abstract:About 17% of the vascular plant species native to Illinois are officially listed as state-threatened or endangered. The original 1980 list (Sheviak 1981) included 312 endangered and 52 threatened species of vascular plants; the current list, revised in 1990 (Illinois Endangered Species Protection Board 1990), includes 296 endangered and 60 threatened species. Some species were included in these lists, based on historical herbarium records, but living populations were not known to occur in Illinois or were known from only one or a few locations. During 1987 and 1988, the authors undertook a project to review the status and to locate populations of 137 of these extremely rare species. In 1987, our emphasis was on locating species for which no extant populations were known. In 1988, our efforts concentrated on species not found during 1987 and on species for which only a few extant populations were known. Fieldwork focused on those species considered most likely to be extant or to be most critical on state and national levels. The results were submitted as unpublished reports to the Illinois Endangered Species Protection Board (Bowles et al. 1988, Bowles et al. 1989). Because those reports are not readily accessible, the information they contain is presented here.
Bowles, M.L. Some aspects of the status and ecology of seven rare wetland plant species in the Chicago region of northeastern Illinois. Pp. 52-66.
Abstract:This report examines the Illinois status of seven endangered (E) or threatened (T) wetland plant species considered for listing status changes by the Illinois Endangered Species Protection Board in 1987. During 1988, populations of Carex atherodes (E), C. crawei (E), C. rostrata (E), Cladium mariscoides (T), Eleocharis rostellata (T), Galium labradoricum (T), and Triglochin palustris (E) were studied in order to collect voucher specimens, quantify population characteristics, and determine levels of protection and endangerment. These species were found to be obligate wetland species with a wide range of population and associated plant community characteristics. The overall number of known extant populations was increased by more than 200% from 34 to 108, with half of the new records for the sedge Carex atherodes; 88% of all populations are now represented by voucher specimens, and 75% of all populations were sampled. A high potential for population loss was found; almost half of the sites examined were endangered or threatened by development or by ecological problems. The number of extant populations was quantified in terms of an Effective Number (N~), which assesses the viability of sites and populations in terms of developmental and ecological threats. Resultant status changes made by the Illinois Endangered Species Protection Board include endangered to threatened for Carex atherodes and Carex crawei, and delisting from threatened for Cladium mariscoides. Based on recent population decline, lack of new populations, and low population numbers, two additional wetland species (Rhynchospora alba and Tofieldia glutinosa) would appear to qualify for status changes from threatened to endangered.
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